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In 1970, 36% of first year college students thought that being very well off financially is very important or essential. by 2000 the percentage had increased up to 74%. these percentages are based on nationwide multistage cluster samples.
a) Is the difference important? or does the question make sense?
b) Does it make sense to ask if the difference is statisically significant? can you answer on the basis of the informations given?
c) repeat b), assuming the percentages are based on independant simple random samples of 1,000 first year college students drawn each year.
What is the mean and standard deviation of the sampling distribution when we take all samples of size25?
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Which of the following is not an advantage of using a cluster sample instead of other types of samples?
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Calculate a 90% confidence interval for the percentage of homes in the US that had guns at the time of survey.
At a = 0.05, can you reject claim that at least 52% of adults are more probable to purchase a product when there are free samples?
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