Take a look at our collection of Statistics at your fingertips
-
Solution: Manager claims average sales for her shop is $1800 a day during winter months. 10 winter days select #1484
-
(Solved) Brand x and brand y of pain relievers were tested to see how much ibuprofen each table contained. Do #1485
-
(See Solution) A study of teenagers found the following information on length of time (in minutes) each talked on p #1486
-
(See Solution) Consumer advocate claims there is no difference in variance of number of hours that 2 companies' bat #1487
-
[Solved] Emergency team responds to calls in a mean time of 8.4 minutes with a standard deviation of .7. A ne #1488
-
(Solved) Test at the .01 level claim that population variance is less than 158 if a sample of 10 had a varian #1490
-
[Solved] Car gets mean of 18mpg. Test see if cheaper grade of gasoline made difference in gas miles at .01 le #1491
-
[Solved] Record store employee claims median age of customer is 17. Test at the .01 level if population was n #1496
-
Solution: Are these answers for a true-false test in random order? State hypotheses and identify claim, find c #1497
-
[Solution] Children and adults ranked 6 different soft drinks. Use spearman rank correlation coefficient to tes #1498
-
[Solved] Students asked to rate teacher on scale of 1 to 20. Students were grouped by grade they made in clas #1499
-
[Solution] Group of dieters started exercise program. Is there a difference in the weight loss without and with #1500
-
[Solved] If null hypothesis is rejected in this problem use Scheffe test if the sample sizes are unequal to t #1501
-
(See Solution) Staff member wishes to determine whether the number of accidents is equally distributed during the w #1502
-
Solution: Article states that 53% of adult shoppers prefer to pay cash for purchases, 30% use checks, 16% use #1504
-
(Solved) Populations of state prisons nationwide by serious offenses are the following: violent offenses, 29. #1505
-
[Solved] Manager believes that 50% of her customers purchase word processing programs, 25% purchase spreadshe #1506
-
[Solved] Is the type of pet owned dependent on annual household income? Use a=0.05. #1507
-
[Solved] Some 300 men and 210 women were asked about how many ads in all media they think they saw or heard d #1508
-
[Solved] Researcher who wants to see if there is a relationship between working and grades collects the follo #1509
-
(Solved) Survey at park shows this selection of snacks purchased. At a=0.10, is the snack chosen independent #1510
-
[Solution] According to survey, 64% of Americans between ages of 6 and 17 cannot pass a basic fitness #1511
-
Solution: Researcher surveyed 100 randomly selected lawyers in each of 4 areas of the country and asked them i #1512
-
[Solved] Children’s playground equipment manufacturer read in survey that 55% of all US playground injuries o #1513
-
[Solution] President of supermarket wished to determine if customers made a list before going shopping. She sur #1514
-
[Solved] Number of grams of fiber per serving for a random sample of 3 different kinds of foods is listed. It #1515
-
[Solution] Lengths (in feet) of a random sample of suspension bridges in the US, Europe, and Asia are shown. At #1516
-
[Solution] Numbers (in thousands) of farms per state found in 3 sections of the country are listed below. Test #1517
-
[Solution] A medical researcher wishes to test the effects of 2 diets and the time of day on the sodium level i #1518
-
Solution: Two programs in outdoor survival are available for army recruits. One lasts one week and the other l #1519
-
[Solved] A company sells 3 items: swimming pools, spas, saunas. Owner decides to see whether age of the sales #1520
-
Solution: A copy machine is advertised as doing 25,000 copies before requiring service. A consumer group want #1524
-
[Solved] IQ tests were administered to 12 subjects at 8 a.m. Two months later, the same test was administere #1527
-
[Solution] In a recent survey of 50 apartment residents, 32 had microwave ovens. In a survey of 60 homeowners #1528
-
(Solved) Use the following data to: a) draw a scatter plot b) find the coefficient of correlation and test th #1529
-
[Solution] If the null hypothesis is rejected use the Scheffe' test when the sample sizes are unequal to test t #1531
-
(Solved) An oceanographer believes that the median height of the waves at Ocean city is 2.8 ft. The wave hei #1532
-
(Solved) A real estate agent suggests that the median rent for a one-bedroom apartment is $325 per month. A #1533
-
[Solved] A study was conducted to see whether a certain diet medication had an effect on the weights (in poun #1536
-
[Solution] An educator designed a reasoning skills course. 9 students were selected and given a pretest to the #1537
-
(Solved) To test a theory that alcohol consumption can have an effect on test scores, a researcher conducts a #1538
-
[Solution] A researcher surveyed married women and single women to ascertain whether there was a difference in #1539
-
(See Solution) Over the past 12 years, a statistician kept track of the total number of academic scholarships award #1540
-
(Solved) The results of a study of payments for flood damages awarded by insurance companies in two Texas cit #1541
-
[Solution] students were given a pretest to measure their public speaking anxiety. They completed a workshop #1542
-
[Solved] Using the data about police forces, can it be concluded that police forces have become larger for th #1543
-
Solution: Samples of four different cereals show the following number of calories for the suggested servings o #1544
-
[Solved] different types of soils are used to grow strawberries. The yields (in quarts) for plots of the s #1545
-
(Solved) In a large city, the number of crimes per week in 5 precincts in recorded for 5 weeks. The data are #1546
-
[Solved] different methods of first-aid instruction are given to students. The same final examination is g #1547
-
Solution: The table shows the total number of tornadoes that occurred in 10 states from 1962 to 1991 and the r #1548
-
[Solution] music videos were ranked by teenagers and their parents on style and clarity, with 1 being the hig #1549
-
[Solution] model kitchens were rated for style and convenience by independent interior designers and by poten #1550
-
(Solved) cars were rated for style, performance, drivability, etc., by independent automotive engineers an #1551
-
Solution: A school dentist wanted to test the claim, at significance level=0.05, that the number of cavities i #1552
-
(See Solution) A machine manufactures audiocassette cases that are either defective (D) or acceptable (A). The seq #1553
-
Solution: A supervisor records the number of employees absent over a 30-day period. Test for randomness. Sign #1554
-
[Solution] These data are the scores on an IQ exam in the order that the students finished the test. Significan #1555
-
[Solved] A study was conducted to see whether a certain diet medication had an effect on the weights (in poun #1559
-
[Solution] An educator designed a reasoning skills course. 9 students were selected and given a pretest to the #1560
-
(Solved) To test a theory that alcohol consumption can have an effect on test scores, a researcher conducts a #1561
-
(Solved) A researcher surveyed married women and single women to ascertain whether there was a difference in #1562
-
[Solution] A researcher surveyed married women and single women to ascertain whether there was a difference in #1569
-
[Solution] Over the past 12 years, a statistician kept track of the total number of academic scholarships award #1570
-
[Solution] The results of a study of payments for flood damages awarded by insurance companies in two Texas cit #1571
-
Solution: students were given a pretest to measure their public speaking anxiety. They completed a workshop #1572
-
(Solved) Using the data about police forces, can it be concluded that police forces have become larger for th #1573
-
Solution: Samples of four different cereals show the following number of calories for the suggested servings o #1574
-
[Solved] Use following data to: ? Draw scatter plot ? Find coefficient of correlation and test significance a #1577
-
[Solution] Given following information is the grade dependent on gender? Test at the .05 level. State hypothese #1581
-
[Solved] Suppose researcher wants to investigate whether proportion of smokers within different age groups is #1582
-
Solution: Record store employee claims median age of customer is 17. Test at the .01 level if population was n #1583
-
(Solved) Are these answers for a true-false test in random order? State hypotheses and identify claim, find c #1584
-
[Solved] Children and adults ranked 6 different soft drinks. Use spearman rank correlation coefficient to tes #1585
-
(See Solution) Students asked to rate teacher on scale of 1 to 20. Students were grouped by grade they made in clas #1586
-
[Solution] Group of dieters started exercise program. Is there a difference in the weight loss without and with #1587
-
Solution: If null hypothesis is rejected in this problem use Scheffe test if the sample sizes are unequal to t #1588
-
[Solved] A statistic S is said to be an unbiased estimator of the unknown parameter θ if E(S)=θ #1590
-
(Solved) Suppose that you are testing the following hypothesis regarding the difference in means of two indep #1591
-
[Solution] This question relates to the Simple Linear Regression Document for the examination that you obtained #1592
-
(See Solution) The residuals in a simple linear regression are the differences between the actual values of y, y(i) #1593
-
(See Solution) This question relates to the Multiple Linear Regression Document for the examination that you obtain #1594
-
(Solved) Consider a multiple regression of Y (gas mileage) on two predictor variables (vehicle weight) and (e #1595
-
[Solution] 88M 7.70M 4.20M 6.60M 6.19M 920K 5.37M 1.35M 870K 760K 950K 4.16M 2.65M 1.97M 5.22M 720K 1.61M 720 #1624
-
Solution: The mean and standard deviation of the gross weekly income distribution of a local company’s 150 emp #1625
-
[Solved] A company that bottles soda has determined that it lost an average of 30.4 cases per week last year #1626
-
[Solved] The tread life of a particular brand of tire is a random variable best described by a normal distrib #1627
-
[Solved] Describe the similarities between an F-ratio and a T statistic. #1628
-
[Solution] A research study comparing three treatment conditions produced means of M1 = 2, M2 = 4, M3 = 6. a. #1629
-
Solution: Using the data from the table below, respond to the following problem i) An experimenter has inves #1630
-
(Solved) What are the primary advantages of a repeated-measures design over an independent-measures design? #1631
-
(See Solution) The results of two repeated-measures studies are summarized as follows: The first study produces a s #1632
-
(See Solution) Research has shown that losing even one night’s sleep can have a significant effect on performance o #1633
-
(See Solution) Explain why it would not be reasonable to use estimation after a hypothesis test for which the decis #1634
-
[Solution] A sample of n = 9 scores is obtained from an unknown population. The sample mean is M = 46 with a st #1635
-
(See Solution) Standardized measures seem to indicate that the average level of anxiety has increased gradually ove #1636
-
Solution: People who use artificial sweeteners in place of sugar tend to be heavier than people who use sugar. #1637
-
(Solved) Ecologists sometimes find strange relationships in the environment. One study seems to show that bea #1638
-
[Solved] A study of rush hour traffic in San Francisco counts the number of people in each car entering a #1639
-
[Solved] We want to know what percent of American adults approve of legal gambling. This population propor #1640
-
[Solution] According to the census bureau, 9.96% of American adults (age 18 and over) are Hispanics. An opin #1642
-
Solution: Biologists studying the healing of skin wounds measured the rate at which new cells closed a r #1643
In case you have any suggestion, or if you would like to report a broken solver/calculator, please do not hesitate to contact us.