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Question: College dining. University and college food service operations have been trying to keep up with the growing expectations of consumers with regard to the overall campus dining experience. Since customer satisfaction has been shown to be associated with repeat patronage and new customers through word-of-mouth, a public university in the Midwest took a sample of patrons from their eating establishments and asked them about their overall dining satisfaction. The following table summarizes the results for three groups of patrons:
(a) Is it reasonable to use a pooled standard deviation for these data? Why or why not? If yes, compute it.
(b) The ANOVA F statistic was reported as 17.66. Give the degrees of freedom and either an approximate (from a table) or an exact (from software) P-value. Sketch a picture of the F distribution that illustrates the P-value. What do you conclude?
(c) Prior to performing this survey, food service operations thought that satisfaction among faculty would be higher than satisfaction among students. Use the results in the table to test this contrast. Make sure to specify the null and alternative hypotheses, test statistic, and P-value.
Law enforcement 2004. Some federal employees have the authority to carry firearms and make arrests. Obviously, some danger is associated with these jobs.
What is meant by the term "90% confident" when constructing a confidence interval for a mean?
A college believes that 28% of applicants to that school have parents who have remarried. How large a sample is needed to estimate the true proportion of students who have parents who have remarried to within 5 percentage points with 95% confidenc..
For each of the following pairs of variables, is there likely to be a positive association, a negative association, or no association?
The? five-year survival rate for Caucasians for all forms of cancer increased by what percentage points.
Imagine a basketball team comprised of thirteen 15-year-old boys. The average height of the team is 69.5 inches. Remember, µ = 67 inches and s = 3.19 inches.
Explain what property associated with the Central Limit Theorem you consider the most important contribution, enabling the use of the normal distribution for sample means.
Can you conclude that every one-bedroom apartment costs less than every two-bedroom apartment? Which is more useful to someone planning to rent an apartment, the confidence interval or the significance test?
When we construct a 90% confidence interval, we say that we are 90% confident that the true population mean lies within the confidence interval.
How many different participants do you need for a completely independent groups assignment, and a completely repeated measures assignment.
Create will help us learn more about the potential profit and allow us to make decisions that will be best for our business.
Using excel, calculate the correlation coefficient, r, for the two variables. How would you interpret this measure?
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