The following are mood scores for 12 participants before and after watching a funny video clip (higher values indicate better mood)
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before
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after
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before
|
after
|
|
7
|
2
|
4
|
2
|
|
5
|
4
|
7
|
3
|
|
5
|
3
|
4
|
1
|
|
7
|
5
|
4
|
1
|
|
6
|
5
|
5
|
3
|
|
5
|
4
|
4
|
3
|
Calculate the paired sample t statistic for these mood scores
Using a one tailed hypothesis test that the video clip improves mood and a p level of 0.05, identify the critical t value and make a decision regarding the null hypothesis
2. Many communication worldwide are lamenting the effects of so called big box retailers (walmart) on their local economies, particularly on small independently owned shop. Do these stores affect the bottom lines of locally owned retailers? Imagine that you decide to test this premise. You assess earnings at 20 local stores for the month of October, a few months before a big box store opens. You then assess earnings the following October, correcting inflation.
What are the two population, what would the comparison distribution be? Explain. What hypothesis test would you use? Explain. Check the assumption for this hypothesis test. What is one flaw on drawing conclusion from this comparison over time.
3 it is harder to get into graduate programs in psychology or history? We randomly selected five institution in the US with graduate programs. The first number is the minimum GPA for applicants to the doctoral program, and the second is for applicants to the history doctoral program. These GPA were posted on the web site of the well known college guide pearson
Wayne state 3.0, 2.75, university of I, 3.0, 3.0;Nevada 3.0,2.75; Washington 3.0, 3.0; Wyoming 3.0, 3.0
The participants are not people explain why it is appropriate to use a paired sample t test for this situation. B) conduct all six steps of paired sample t test. Be sure to label all six steps. C) report the statistics as you would in a journal article.
Using the research studies described here (from Exercise 11.57), create null hypothese and research hypotheses appropriate for the chosen statistical test:
a. Taylor and Ste-Marie (2001) studied eating disorder in 41 Canadian female figure skaters. They compared the figure skaters' data on the Eating Disorder Inventory to the means of known populations, including women with eating disorders. On average, the figure skaters were more similar to the population of women with eating disorders than to those without eating disorders
b. In article titled "A fair and Balanced Look at the News: What Affects Memory for Contoversial Arguments," Wiley (2005) found that people with a high level of previous knowledge about a given controversial topic (e.g., abortion, military intervene) had better average recall for arguments on both sides of that issue than did those with lower levels of knowledge.
c. Engle-Friedman and colleagues (2003) studied the effects of sleep deprivation. Fifty students were assigned to one night of sleep loss (students were required to call the laboratory every half-hour all night) and then one night of no sleep loss (normal sleep). The next day, students were offered a choice of math problems with differing levels of difficulty. Following sleep loss, students tended to choose less challenging problems.
Use the following data to answer the following question: 15 24 35 16 18 22 16 72
Calculate the mean and median of the data set. What do the mean and median suggest about the distribution of data. B) apply the square root transformation on the data set. C) calculate the mean and median for the transformed data. How has the relation between the mean and the median changed? What does this suggest about the distribution of the transformed data?
Men: 16,345 17,222 15646 14,889 16,701
Women 17,345 15,593 16,624 16,696 14, 200. Calculate the 95% confidence interval for these data.