Homework Answers
Assumption of Normality means that the sampling distribution of the mean is normal or that the distribution of means across samples is normal or data roughly fits a bell shaped curve before running certain statistical tests or regression.
The Mann-Whitney U test is used to compare differences between two independent groups when the dependent variable is either ordinal or continuous, but not normally distributed. So to carry out mann Whitney test, data should not meet assumption of normality as It depends on the weaker assumption that the median is a useful way to characterize the data. So If it is conducted on data with normal distribution, results will not be valid.
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What is the assumption of normality? If a researcher is conducting the Mann-Whitney Test, does this...
-It would not be appropriate to use the Mann–Whitney U test when: a researcher is comparing...
-It would not be appropriate to use the Mann–Whitney U test when: a researcher is comparing two independent populations. the dependent variable is measured at the ordinal level. the assumptions for an independent-samples t test are not met. a researcher is comparing three or more groups on a normally distributed dependent variable. -Kia assesses people's levels of gratitude and stress that occur naturally to determine if a relationship exists between the two variables. Kia is using a(n): correlational design experimental...
Imagine that a researcher is conducting a paired-samples t test. She finds that the sample mean...
Imagine that a researcher is conducting a paired-samples t test. She finds that the sample mean difference is 5, the standard deviation of the difference scores is 15, and the sample size is 85. The researcher is also using a typical null hypothesis that proposes no differences between the relevant population means. Under these circumstances, what is the value of the paired-samples t statistic? Please retain a minimum of three decimal places for all steps (if relevant) and provide a...
Note: for all problems, assume a.05 1. A common assumption is that sleep deprivation influences aggression. To test this assumption, volunteer subjects are randomly assigned by a researcher to sl...
Note: for all problems, assume a.05 1. A common assumption is that sleep deprivation influences aggression. To test this assumption, volunteer subjects are randomly assigned by a researcher to sleep-deprivation periods of 0, 24, 48, and 72 hours and subsequently tested for aggressive behavior in a controlled social situation. Aggressive scores signify the total number of different aggressive behaviors, such as "put downs," arguments, or verbal interruptions, as demonstrated by subjects during the test period. You are given the following...
When conducting a T-test, the difference between two groups is 1 and 0.337. What does the...
When conducting a T-test, the difference between two groups is 1 and 0.337. What does the results say? Is 1 a significant difference and what does it mean?
The StudentSurveyAnxietyData.xlsx contains the Survey results on the question: How much does PRS decrease your anxiety...
The StudentSurveyAnxietyData.xlsx contains the Survey results on the question: How much does PRS decrease your anxiety level? The answers were on scale 1-4. 1-increased 2-none 3-somewhat 4-a lot The question you have to answer is: Are there any differences in response between the students with different grade expectation? Write Executive summary, Test used and why, Report, Conclusion USE Mann-Whitney U test LINK IS UNDERNEATH TO ACCESS DATA : https://drive.google.com/file/d/1Jid9Br2X8ZajG7uRUqIa6Em9PFcEDqPm/view?usp=sharing
The purpose of this activity is to gain experience conducting a chi-square test of independence using...
The purpose of this activity is to gain experience conducting a chi-square test of independence using technology. Recall the report On the Front Line: The Work of First Responders in a Post-9/11 World. We will use data from this report to investigate the question: Are alcohol-related problems among New York firefighters associated with participation in the 9/11 rescue? Here again are our observed data: No Risk for Alcohol Problems Moderate to Severe Risk for alcohol problems Participated in 911 rescue...
please give correct and answer all question.. this is revision question... 14. Which of the following...
please give correct and answer all question.. this is revision
question...
14. Which of the following statistical tests is BEST TO normally distributed data? in statistical tests is BEST to use for comparing two samples A. Independent sample t-test B.Mann-Whitney test C. Regression analysis D. Logistic regression analysis 15. Which of the following is NOT related to central limit theoret? sample size is large. bution of sample mean, x is approximately normal regardless of Xin the population 9. The mean...
The Chow test is based on two assumptions. You suspect that the assumption that the error variance is the same for the 2 periods, does not hold. The result being that the Chow test is not appropriate...
The Chow test is based on two assumptions. You suspect that the assumption that the error variance is the same for the 2 periods, does not hold. The result being that the Chow test is not appropriate to test for structural breaks in our data. Test if the assumption of equal error variance holds. (What is expected of me?)
9. Referring to question 8, If the alternative is directional and the test statistic Ws-41 what...
9. Referring to question 8, If the alternative is directional and the test statistic Ws-41 what is the conclusion at the 5% level of significance? Reject the alternative hypothesis b. a. Fail to reject the alternative hypothesis Reject the null hypothesis d. c. Fail to reject the null hypothesis 10. In a hunger test nine women were rated using the drug CPP and a placebo. Ea of the women were tested for two weeks with the drug and then with...
QUESTION 2 When shouldI use the Welch's t-test? Remember that some tests, such as chi squared,...
QUESTION 2 When shouldI use the Welch's t-test? Remember that some tests, such as chi squared, can be used under various circumstances. The goal of the test changes based on the situation. Pay attention to the specific conditions noted in parenthesis to ensure you are picking the correct goal Compare categorical frequency data with an expected population proportion. No difference between observed and expected proportions is used as the null hypothesis B. More than two treatment groups where a normal...
Note: for all problems, assume a.05 1. A common assumption is that sleep deprivation influences aggression. To test this assumption, volunteer subjects are randomly assigned by a researcher to sleep-deprivation periods of 0, 24, 48, and 72 hours and subsequently tested for aggressive behavior in a controlled social situation. Aggressive scores signify the total number of different aggressive behaviors, such as "put downs," arguments, or verbal interruptions, as demonstrated by subjects during the test period. You are given the following...
please give correct and answer all question.. this is revision
question...
14. Which of the following statistical tests is BEST TO normally distributed data? in statistical tests is BEST to use for comparing two samples A. Independent sample t-test B.Mann-Whitney test C. Regression analysis D. Logistic regression analysis 15. Which of the following is NOT related to central limit theoret? sample size is large. bution of sample mean, x is approximately normal regardless of Xin the population 9. The mean...
9. Referring to question 8, If the alternative is directional and the test statistic Ws-41 what is the conclusion at the 5% level of significance? Reject the alternative hypothesis b. a. Fail to reject the alternative hypothesis Reject the null hypothesis d. c. Fail to reject the null hypothesis 10. In a hunger test nine women were rated using the drug CPP and a placebo. Ea of the women were tested for two weeks with the drug and then with...
QUESTION 2 When shouldI use the Welch's t-test? Remember that some tests, such as chi squared, can be used under various circumstances. The goal of the test changes based on the situation. Pay attention to the specific conditions noted in parenthesis to ensure you are picking the correct goal Compare categorical frequency data with an expected population proportion. No difference between observed and expected proportions is used as the null hypothesis B. More than two treatment groups where a normal...
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