Take a look at our large list of Statistics solutions available
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[Solved] The following data are from an experiment comparing three treatment conditions with a separate sampl #21454
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Solution: A researcher reports an F-ratio with df=2, 24 for an independent-measures research study. a) How man #21455
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[Solved] The following summary table presents the results from an ANOVA comparing three treatment conditions #21456
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[Solved] One possible explanation for why some birds migrate and others maintain year round residency in a si #21457
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Solution: (40%) Professors X, Y, and Z are fiercely competitive. They have each trained 5 lab rats to run a ma #21458
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(Solved) (40%) Each of the professors in (1) has a lab on a different floor of their 4 story building. Profes #21459
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Solution: (20%) If you were comparing the number of candy bars consumed each day for two groups of students, w #21460
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Solution: (Extra credit - 20%) An ANOVA provides you with an overall idea of whether there are some difference #21461
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Solution: Eighteen subjects are randomly selected and given proficiency tests. The mean for this group is 492. #21462
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Solution: Using the sample data from question #1, construct the 98% confidence interval for the population sta #21463
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[Solved] We want to estimate, with a maximum error of 0.025, the true proportion of adult Americans who are o #21464
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[Solution] A survey of 300 union members in New York State reveals that 37.3% favor the Republican candidate fo #21465
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Solution: What is the point estimate of the population mean for problem #1? #21466
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[Solution] What is the point estimate of the population proportion p of voters favoring the Republican candidat #21467
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[Solved] What are the left and right chi-square critical values for and n = 10? #21468
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[Solved] A physical researcher devises a test of strength and finds that the results are normally distributed #21469
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[Solution] Using the same population data given in problem 1, find the 20th percentile? ANSWER 101.2 #21474
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[Solution] If sixty different subjects are selected from the population described in question 1, find the proba #21475
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(See Solution) A certain question on a test is answered correctly by 22% of the respondents. Find the probability t #21476
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[Solution] Using the information given in problem 8, find the probability that there will be at least 40 correc #21477
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(See Solution) Suppose thirty-five percent of adults did not visit their physicians' offices last year. Let x be th #21478
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Solution: Construct a 99% confidence interval for the mean of the population of all statistics students from w #21479
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[Solved] In a recent Gallup poll, 43% of adults said that it is easier to raise boys than girls. Assume this #21480
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[Solved] According to the American Federation of Teachers, the average salary of 1998 college graduates with #21481
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(See Solution) The manufacturer of a certain brand of auto batteries claims the mean life of these batteries is 45 #21482
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(See Solution) A health club manager claims that members lose an average of 15 pounds during the first six months o #21483
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[Solved] A computer company that recently introduced a new software product claims that the mean time it take #21484
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(See Solution) Organize the following data into a grouped frequency distribution (with intervals of three) and incl #21486
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(Solved) For the following numbers please determine the mean, median, and the mode. What can you say about th #21487
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[Solution] In a study of 911 calls made to a large Midwestern police department, Gilsinan (1989) reported the f #21488
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[Solved] A group of convicts was given the following prison sentences (in years): 3 5 3 4 45 5 3 2 3 1 a. Fi #21489
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[Solution] On a normal distribution of scores, five participants obtained the following deviation scores: -6, + #21490
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[Solved] Consider the monthly stock returns presented in Table 1. (a) What return is the bottom quintile? (b) #21492
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[Solved] Consider the monthly stock returns presented in Table 1. Test the hypothesis that average monthly re #21493
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[Solved] Consider the monthly stock returns presented in Table 1. Using a chi-squared (?2) goodness of fit te #21494
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[Solved] Keeping water clean. Manufacturing companies (and the Environmental Protection Agency) monitor th #21495
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[Solution] More secondhand stores. The study of shoppers in secondhand stores cited in the previous exercise al #21496
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[Solved] Mail survey response rate. Can you increase the response rate for a mail survey by contacting the re #21497
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[Solved] Hotel sizes and numbers of employees. A human resources study of hotels collected data on the size #21498
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Solution: Bank auto loans. Banks charge different interest rates for different loans. A random sample of 2229 #21499
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Solution: Write the model. For each of the following situations write a model for µy of the form µy = ?0 + ?1x #21500
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(Solved) Vitamin-enriched bread. Does bread lose its vitamins when stored? Small loaves of bread were prepare #21501
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[Solution] Webcridible, a UK-based consulting firm specializing in Web sites, intranets, mobile devices, and ap #21502
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Solution: The owner of a gasoline station wants to study gasoline purchasing habits by motorists at his statio #21503
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[Solution] An auditor for a government agency is assigned the task of evaluating reimbursement for office visit #21504
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Solution: You plan to conduct a marketing experiment in which students are to taste one of two different b #21505
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[Solution] The Agency for Helathcare Research and Quality reports that medical errors are responsible for i #21506
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Solution: If 98% of our market has internet access, do we have a responsibility to provide non-internet ma #21507
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[Solved] Using undergradsurvey file A. For these data, for each variable, construct a 95% confidence int #21508
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[Solution] Using gradsurvey file A. For these data, for each variable, construct a 95% confidence interval #21509
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[Solved] College students mark an average of 11 calls per day on their cell phone 80 % of them have their par #21512
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(Solved) Nicotine in Cigarettes Refer to the nicotine contents of cigarettes listed in Data Set CIGARET.XLS ( #21513
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[Solution] Do Trucks Have the Same Color Distribution as Cars? A study of sport and compact car colors shows th #21514
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[Solution] Firearm Training and Safety Does firearm training result in safer practices by gun owners? In one s #21515
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[Solved] Find the area to the left of z=-1.25. #21516
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(See Solution) Find the area in between z=-1.1 and z=-2.2 #21517
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[Solution] The mean patient length of stay at a hospital was 4.87 days with a Standard deviation of 0.97 days. #21518
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(See Solution) What is the sampling distribution of the sample mean? #21519
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[Solved] The mean concentration of carbon dioxide is 365 parts per million with a standard deviation of 100pp #21520
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[Solution] Why is the central limit theorem important? #21521
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[Solved] Colour blindness affects 8% of men. Take a sample of 100 men. What is the standard error of the samp #21522
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[Solved] What is a confidence interval? #21523
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[Solved] The mean height for a sample of n=81 women is 64.2 inches with a sample standard deviation of 2.7 in #21524
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[Solution] A 95% confidence interval for a population mean is (2.7152, 9.1048). a) What is the sample mean? b) #21525
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(See Solution) A study showed 3.9% of twelth graders used Ecstasy. If the sample size was 200, find a 99% confidenc #21526
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[Solved] Interpret the confidence interval in question 11 (A study showed 3.9% of twelfth graders used Ecstas #21527
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[Solution] A student takes a 10 question, true-false quiz in which the null hypothesis is that the student is j #21528
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[Solution] To test the hypothesis that the mean number of cigarettes smoked by smoking adults is 18.1, a sample #21529
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(Solved) The manufacturer of Nexium claims that it is effective in 94% of people who take it. In a trial, 213 #21530
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(Solved) Which do you think is more informative when you are given the results of a hypothesis test, the p-va #21531
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[Solution] Which do you think is more informative when you are given the results of a study, a confidence inter #21532
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(See Solution) Explain whether or not the following statement is true or not..."Hypotheses and conclusions from hyp #21533
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[Solution] A t-test for a mean uses a sample of 20 observations. Find the t test statistic value that has a p-v #21534
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Solution: A study has a sample of 15 subjects. The test statistic for testing the null hypothesis mu =100 is #21535
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(Solved) In an anorexia study, 29 girls received cognitive therapy. The resulting weight changes had a mean o #21536
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[Solved] A study of 13 children with asthma compared single inhaled doses of formoterol (F) and salbutamol (S #21537
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(See Solution) Proportions. For a test of null: p=0.5, the z-test stat. is 1.54 . Find the p-value for the alt. hyp #21538
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(See Solution) For a test of null: p=0.5, the sample proportion is 0.35 based upon a sample size of 100. a) Find th #21539
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(Solved) In a study to assess the effect of a drug on PMS symptoms, 7 out of 10 women reported success. a) F #21540
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[Solution] Do women do more housework? Sex Sample Size Mean Stan. Dev. F 6764 32.6 18.2 M 4252 18.1 12.9 Find a #21541
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[Solution] Teenagers were assessed for nicotine dependence. The mean “Hooked on Nicotine Checklist” score for 1 #21542
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(See Solution) How large a chi-squared statistic provides a P-value of 0.05 for testing independence in a 3x5 tabl #21543
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[Solved] Who’s happier? HAPPY SEX Not Pretty Very F 163 898 502 M 130 705 379 Conduct a chi-squared test to #21544
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(Solved) A Swedish study testing aspirin vs. a placebo reported that 28 of 684 placebo patients and 18 of 676 #21545
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(Solved) Consider the following data: x 3 5 8 9 12 12 y 18 20 16 10 12 8 Calculate Pearson’s correlation co #21546
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(Solved) Consider the following data: # sunny days (x) 250 330 210 342 265 227 280 278 321 338 # suicides p #21547
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(Solved) What is the predicted number of suicides when there are 300 sunny days in the year? Would this be a #21548
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(See Solution) Switch the x and y variables on question 14. Recalculate the simple linear regression line. Which #21549
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[Solution] According to the Census Bureau's 2002 American Community Survey, the average travel time to work of #21550
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Solution: Assume that body temperatures of healthy adults are normally distributed with a mean of 98.2°F and a #21551
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[Solved] What are the four requirements that need to be checked before assuming the sampling distribution of #21552
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(See Solution) Calculate the minimum sample size n* that produces a sampling distribution of is that is approximate #21553
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(See Solution) It is known that the proportion of aardvarks that have an extra toe on their left foot is .37. A sam #21554
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(Solved) Heights of American women aged 18 to 24 have a mean of 65.5 inches and standard deviation 2.5 inches #21555
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[Solution] According to the Census Bureau's 2002 American Community Survey, the average travel time to work of #21556
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[Solution] Assume that body temperatures of healthy adults are normally distributed with a mean of 98.2°F and a #21557
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Solution: A bearing assembly contains 10 bearings. The bearing diameters are assumed to be indepen #21569
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Solution: Find Var(X). #21571
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[Solution] The Rockwell hardness of a metal specimen is determined by impressing the surface of the #21574
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[Solution] If the acceptable range is 70 ± c, for what value of c would 95% of all specimens be acc #21575
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[Solved] A soft drink machine can be regulated so that it discharges an average of ? ounces per #21576
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(See Solution) The width of a slot of duraluminum forging is (in inches) normally distributed with ? = #21577
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