Statistics Test **Need an A+**
aashley
Exam3.docx1. A political scientist wants to find out if there is a correlation between listening to a newscast and an individual’s mood. This researcher recruits a group of participants and has them listen to a newscast that was recorded earlier that morning. Participants are instructed to listen for as long as they want; when they are done listening, the researcher writes down the listening duration and then asks each participant to complete the Acme Mood Report (AMR), a self-administered instrument that renders a score between 0 and 100 (0 = very bad mood, 100 = very good mood). What is the null hypothesis? Be sure to use the correct notation.
2. A political scientist wants to find out if there is a correlation between listening to a newscast and an individual’s mood. This researcher recruits a group of participants and has them listen to a newscast that was recorded earlier that morning. Participants are instructed to listen for as long as they want; when they are done listening, the researcher writes down the listening duration and then asks each participant to complete the Acme Mood Report (AMR), a self-administered instrument that renders a score between 0 and 100 (0 = very bad mood, 100 = very good mood). What is the alternate hypothesis? Be sure to use the correct notation.
3. Based on the two histograms below, is the pretest criterion of normality satisfied? Explain why or why not.
4. Based on the scatterplot below, are the criteria for linearity and homoscedasticity satisfied? Explain why or why not.
5. Based on the below output, answer the following questions.
What is the r value?
What type of correlation exists (negative or positive, strong, weak or moderate)?
What is the p-value?
Using a .05 α level, is this a statistically significant correlation or not?
6. Based on the results of the Pearson correlation, comment on the overall study, including the p-value and state your decisions on rejecting or not rejecting the null and alternate hypotheses.
7. Ariel and Dusty want to determine how similar their movie preferences are. They independently rank the 13 movie categories with their favorite at the top. The choices are 1 = Action/Adventure, 2 = Animation, 3 = Comedy, 4 = Cult Movie, 5 = Documentary, 6 = Fantasy, 7 = Film Noir, 8 = Horror, 9 = Romantic, 10 = Sci-Fi, 11 = Spy, 12 = Western, and 13 = Zombies. What is the null hypothesis? Be sure to use the correct notation.
8. Ariel and Dusty want to determine how similar their movie preferences are. They independently rank the 13 movie categories with their favorite at the top. The choices are 1 = Action/Adventure, 2 = Animation, 3 = Comedy, 4 = Cult Movie, 5 = Documentary, 6 = Fantasy, 7 = Film Noir, 8 = Horror, 9 = Romantic, 10 = Sci-Fi, 11 = Spy, 12 = Western, and 13 = Zombies. What is the alternate hypothesis? Be sure to use the correct notation.
9. Ariel and Dusty want to determine how similar their movie preferences are. They independently rank the 13 movie categories with their favorite at the top. The choices are 1 = Action/Adventure, 2 = Animation, 3 = Comedy, 4 = Cult Movie, 5 = Documentary, 6 = Fantasy, 7 = Film Noir, 8 = Horror, 9 = Romantic, 10 = Sci-Fi, 11 = Spy, 12 = Western, and 13 = Zombies. Verify that the pretest checklist is met for test.
10. Based on the below output, answer the following questions.
What is the rho value?
What type of correlation exists (negative or positive, strong, weak, or moderate)?
What is the p-value?
Using a .05 α level, is this a statistically significant correlation or not?
11. Based on the results of the Spearman correlation, comment on the overall study, including the p-value and state your decisions on rejecting or not rejecting the null and alternate hypotheses.
12. The Smith Veterinary Nutrition Laboratory wants to find out if its three dog foods appeal to all dogs equally or if breed is a factor in a dog’s food preference. Per the research criteria specified, you recruit 90 pets: 30 Cocker Spaniels, 30 Beagles, and 30 Keeshonds. Owners are asked not to feed their pets for 4 hours prior to the test. Each dog is tested individually; the dog is placed 5 feet (1.5 meters) away from three clear bowls of dog food, all with equal weights. On cue, the leash is removed and the dog is free to eat from any bowl(s). After dismissing each participant, you weight the bowls; the lightest bowl wins (meaning that the dog at the most food from that bowl). In case of a tie, the winning bowl is the one that the dog went to first. What is the null hypothesis? Be sure to use the correct notation.
13. The Smith Veterinary Nutrition Laboratory wants to find out if its three dog foods appeal to all dogs equally or if breed is a factor in a dog’s food preference. Per the research criteria specified, you recruit 90 pets: 30 Cocker Spaniels, 30 Beagles, and 30 Keeshonds. Owners are asked not to feed their pets for 4 hours prior to the test. Each dog is tested individually; the dog is placed 5 feet (1.5 meters) away from three clear bowls of dog food, all with equal weights. On cue, the leash is removed and the dog is free to eat from any bowl(s). After dismissing each participant, you weight the bowls; the lightest bowl wins (meaning that the dog at the most food from that bowl). In case of a tie, the winning bowl is the one that the dog went to first. What is the alternate hypothesis? Be sure to use the correct notation.
14. Based on the Crosstabulation table below, is the pretest criterion satisfied? Explain why or why not.
15. Based on the Chi-Square results below, comment on the overall study, including the p-value, percentages for preference, and state your decisions on rejecting or not rejecting the null and alternate hypotheses.
16. Explain what homoscedasticity is.
17. What type of variable is age?
18. Using the graph below indicate the following:
Is this a negative or positive relationship?
Is this a strong, weak, or zero linear relationship?
Explain the relationship between the two variables.
19. Discuss the three requirements of causality and what they mean.
20. Layla and Tianna are asked to rank their preferences for American political parties. Below are Layla’s and Tiana’s lists. What is the Spearman rho for these lists and why?
|
Layla |
Tiana |
|
Republican |
Democrat |
|
Independent |
Independent |
|
Democrat |
Republican |
21. Design a study that would allow for a multiple regression. Include what variable(s) you would need and why you think a correlation might exist.
22. Design a study that would allow for a logistic regression. Include what variable(s) you would need and why you think a correlation might exist.
23. What is a dichotomous variable? Give an example of one and the values that it takes.
24. What is stratified sampling? Give an example of stratified sampling.
25. Choose one rationale for using statistics (modifying or enhancing existing implementations, creating or amending policies, assembling best-practices guidelines for various professional fields, or evaluating an existing program) and explain a scenario where it is crucial for social research or criminal justice research.
