38. A researcher wants to predict persona composition for females based on the following data.

Calculate the regression equation for predicting Sugar level based on Spice Content. You have to figure out which one is \(X\) and which is \(Y\) (do not ask me, folks! (P).

What is the correlation between Spice Content and Everything Nice? What is the variance for these two variables?

39. A researcher wants to test if the awesomeness level of her PYC 5030 students is greater than the national level of students taking this course. The national average is 1.6. Conduct the appropriate test and outline all steps of hypothesis testing using the data below.

40. A researcher was interested in comparing marital satisfaction for husbands before and after children were introduced to their marriage. Conduct the appropriate test and outline all steps of hypothesis testing using the data below.

41. Using the output below, write the regression equation for predicting Science score from the variables instead. Was the model significant? Were there any predictors that were not significant? Which?

42. A researcher compared spatial rotation between men and women and yielded the following results. Was there a significant difference? If high scores indicate greater accuracy, who was more accurate in this case?

Two-Sample t-tests

SPSS Assignment 6

For Questions 1 and 2, include all Steps of Hypothesis Testing. For each problem, use the \(p\) -value from SPSS to determine whether to accept or reject the null hypothesis and don't forget to indicate your conclusion about whether there is a significant difference.

1. An instructor believed that the students who earn a $C$ or higher differ in the number of hours they spend studying, compared to students who receive a D or F. She collected the following data on two independent samples of students from a class of 150 students.
   
   Using SPSS and \(\alpha=.05\), conduct an appropriate statistical test. There is no data file; you must enter the data yourself. Submit all written steps and the actual SPSS output.
2. An investigator wishes to compare the effects of two different training methods on the performance of a particular task. He recruits eight sets of identical twins and randomly assigns the twins within each pair to Training Method 1 or Training Method 2. Assume that the following results are obtained, where higher scores indicate better performance.

Hint: Before deciding how to enter and analyze these data, think for a moment about why we're telling you that the subjects are identical twins.

Conduct an appropriate statistical test using SPSS and \(\alpha=.05\). There is no data file; you must enter the data yourself. Submit all written steps and the actual SPSS output.

One-Way ANOVA

SPSS Assignment 8

For Questions 1 and 2, include all Steps of Hypothesis Testing. For each problem, use the p-value from SPSS to determine whether to accept or reject the null hypothesis and don't forget to indicate your conclusion about whether there is a significant difference.

1. In a study on the effects of reward on learning in children, a researcher randomly assigned 25 children to five reward conditions. Each child was given a puzzle that could be solved only if the moves were learned in order. Tor Group 1, every correct move was rewarded until the puzzle was solved; for Group 2, 75% of correct moves were rewarded on a random schedule; for Group 3 , \(50 \%\) of correct moves were rewarded on a random schedule; for Group 4, 25% of correct moves were rewarded on a random schedule; and for Group 5 , no moves were rewarded. The table below shows the number of trials each child took to learn the correct sequence of moves.
   
   Using SPSS and an alpha level of .05, determine whether there is an overall effect of reward and if there are specific differences between the groups. Include means and standard deviations in your SPSS output, and don't forget to indicate your conclusion.
2. Problem #1 of the Practice Problems examines whether three nutrition groups differed. Using SPSS, conduct the same tests you calculated by hand for this problem, including the post-hoc analysis. Did you get the same results? Explain why, or why not?

1. A nutritional expert randomly assigned a sample of 18 bicyclers to three groups. Group A was instructed to eat as they normally do. Group B was given a vitamin supplement. Group C was put on a diet of health foods. The expert subsequently recorded the number of minutes it took each person to ride 6 miles. Determine if there are any differences among the three groups (which includes first determining if there is an overall effect of nutrition condition). Use a .05 alpha level. What do you conclude? Be sure to report means and standard deviations.

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