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Question: A researcher is interested in differences in the use of sick days by younger and older adults working for a state agency. A random sample of 10 younger (under 30) and 10 older (over 50) workers yielded the following data in sick days used within the past 12 months. Use these data to test the null hypothesis of no difference in the use of sick days between younger and older adults. Use α = 0.05. What do your results indicate?
Younger Adults Older Adults
1 2
10 7
2 13
3 5
13 10
6 12
7 25
4 14
0 5
4 8
Obtain descriptive statistics and graphic displays for these salt taste indices. Do the indices appear to be normally distributed? Why or why not?
A certain disease occurs in 35% of the population. A test for the disease is fairly accurate: it misclassifies people with the disease as healthy 6% of the time and reports that a healthy person is diseased just 7% of the time.
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You survey a sample of 10 college students to measure their racial prejudice using a scale of 0 (no prejudice) to 100 (extreme prejudice). Here are the scores you obtained.
Find out 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
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Is there significant evidence that this production run doesn't meet specifications? Use a 1% level of significance.
Explain the assignment model and how it is similar to a transportation problem. Give a real-world example of an assignment model to describe what is transported where.
Determine the expected shape of distribution of sample mean? Compute the likelihood of choosing a sample with mean of at least $112,000?
a basketball team at a university is composed of ten players. the team is made up of players who play the position of
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