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Disney wants to examine whether the teenagers have higher preference than adults before entering the park with α = .05. A random sample of 10 for each group shows the following: Teenagers: sample average preference = 5.6 and SD = 1.09. Adults: sample average preference = 4.1 and SD = 1.06. Test the Disney's hypotheses with α=.05.
The candidate then attacks the incumbent mayor, saying that there is an unusually low level of homeownership in the city. Do you agree? Explain.
a bank manager wishes to provide prompt service for customers at the banks drive-up window. the bank currently can
Explain these results to a person who understands the t test for a single sample but knows nothing about the t test for independent means.
Assume you have received a class assignment to determine the attitude of students in your school toward the school's registration process. What are the validity issues you should be concerned with?
1. a candidate for one of ohios two u.s. senate seats wishes to compare her support among registered voters in the
explain some of the differences between the method of distribution functions the transformation method for finding the
For the simple random sample of 40 homeowners invited to attend her town meeting, describe the sampling distribution of p = the proportion of Republicans among those invited to the meeting.
In a normal distribution with mean 56 and standard deviation 21, how large a sample must be taken so that there will be at least a 90%
Evaluate the validity of this claim by considering the data collection, the analysis, and the potential for error in interpreting this claim.
Determine whether a census is practical in the situation described. Explain your reasoning.
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval
The mean of a population of raw scores is 50 (ox=18). What is the probability of randomly selecting a sample of 40 score having a mean above 46?
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