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OpenStudy (anonymous):
An SRS of 16 Spokane County Schools' seniors had a mean SAT Verbal score of 500 with a standard deviation of s = 100. We know that the population is normally distributed. We wish to determine a 90% confidence interval for the mean SAT Verbal score µ for the population of all seniors in the district. a. Using the above data, the critical value has how many degrees of freedom? b. What is the critical value for the 90% confidence interval? c. Find the 90% confidence interval. d. Suppose the population of all high school seniors has a mean score of 450. We wish to see if the data provide evi
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