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A student group is conducting a study to determine whether there is a difference between textbook prices for new textbooks sold by on-campus bookstore at a university and an Internet retailer. A random sample of 10 textbooks was taken and the campus price and the Internet retailer's price for each text book were collected. At the 0.01 level of significance, can the student group conclude that there is a difference in average textbook prices for new textbooks sold on campus and over the Internet?
Textbook Campus InternetPhysics 108 124Chemistry 114 120Spanish 114 107Accounting 110 112Calculus 118 122Economics 108 123Art 119 125Biology 115 108History 119 117English 114 119
Suppose a candidate running for sheriff claims that she will reduce the average speed of emergency response to less than 30 minutes.
Taking α to be 0.05, what is/are the critical values associated with testing your hypothesis?
A bowl contains R red and W white chips. Suppose N chips are drawn without replacement from the bowl.
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Assuming the manufacturer's claim is true, what is the approximate probability of observing a sample mean of 52 months or less?
Setup Null and Alternate hypotheses to test if average amount of soda in each can is less than 32 oz. Test the hypothesis using a = 0.05. What can you conclude from all this?
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