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A recent sample yielded a sample mean of 101.4. Conduct a hypothesis test to determine whether the mean width has increased. Use a 0.01 significance level.
The above data are the differences in SAT scores obtained by a student before the training and after the training. What is this an example of?
In a large northwestern university, an SRS of 100 entering freshmen in 1988 found that 20 finished in the bottom third of their high school class.
An inspector inspects large loads of potatoes to determine the proportion p in the shipment with major defects prior to making potato chips
A random sample of 200 freshman and 100 seniors at Ferris High School are asked whether they agree with a plan to excuse upper class students (juniors and seniors) a half hour early while keeping un
ABC University Administration has hired your group as business consultants to determine whether the University should expand its undergraduate and graduate business programs to an offsite location o
What is the chance that none of the test patients will be nauseas after taking this drug? What is the chance that one and only one of the test patients will be nauseas after taking this drug?
If the goal is to test whether less than 65% of the flights depart on time, what is the value of the calculated test statistic at the 5% level of significance?
In many ways, comparing multiple sample means is simply an extension of what we covered last week. What situations exist where a multiple (more than two) group comparison would be appropriate?
A regression was estimated using these variables: Y = value of reported bank robbery losses in U.S. banks ($ millions), X = value of currency held by all U.S. banks
What is the response variable in a logistic regression model? To what distribution does the response variable belong? What quantity follows a logistic distribution?
What is the chance that in the next five square feet of laminated paper, exactly as many defects as expected will be found
Comparing the amount of money people spend and the amount people save, your analysis revealed an R-squared=0.97. Should you use this for predictive purposes and why?
describe two designs that can address your research question. The designs must involve two different statistical analyses
You are investigating the relationship between a person's gender and the automobile he or she drives- specifically you want to show that males tend to drive truck type vehicles more than females do.
To make an informed decision, you decide to reach the rate of return for the past 3 years for each type of mutual fund. The mutual fund must have a Morningstar rating of four or five stars
To check out the most recent monthly shipment of the engines, you randomly select and test 200 of these engines. What is the average number of leaky engines you would expect to get
calculate the risk ratio, odds ratio and incidence rate ratio for the effect of regular excercise on osteoporosis in these women and provide a one-sentence interpretation for each result
A study of long-distance phone calls made from the corporate offices of General Electric revealed the length of the calls, in minutes, follows the normal probability distribution.
Conduct a one-tailed hypothesis test given the information below. A manufacturer wants to increase the shelf life of a line of cake mixes. Past records indicate that the average shelf life of the mi
You are preparing a report to present to the Public Health Council on the declining rates of gonorrhea in your state in both men and women over the last 10 years
According to menstuff.org, 22% of married men have "strayed" at least once during their married lives. A survey of 500 married men results in 122 indicating that they have "strayed" at least once du
determine the rejection region(s) and shade on your sketch e) calculate the standardized test statistic and mark on your sketch f) determine whether to accept or reject the null hypothesis
calculate the standardized test statistic and mark on your sketch f) determine whether to accept or reject the null hypothesis g) interpret your decision in the context of the original claim.