A random sample of 60 mathematics majors spent an average of 200.00 for textbooks for a term, with a standard deviation of 22.50 . A random sample of 40 English majors spent an average of 180.00 for textbooks that term, with a standard deviation of 18.30 . Calculate a 90 pooled confidence interval for the difference in average amounts spent on textbooks (math majors English majors).
a. (12.91, 27.09)
b. (11.50, 28.50)
c. (13.19, 26.81)
d. None of the above
Question 2
Which of the following statements is correct about a parameter and a statistic associated with repeated random samples of the same size from the same population?
a. Values of a parameter will vary from sample to sample but values of a statistic will not.
b. Values of both a parameter and a statistic may vary from sample to sample.
c. Values of a parameter will vary according to the sampling distribution for that parameter.
d. Values of a statistic will vary according to the sampling distribution for that statistic.
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