A Professor Finds That the Average SAT Score Among All

question 58

Multiple Choice

A professor finds that the average SAT score among all students attending his college is 1150±150 ( ) .He polls his class of 25 students and finds that the average SAT score is 1200.Suppose he computes a one-sample z test at a .05 level of significance.What is his decision?

• A)to reject the null hypothesis
• B)to retain the null hypothesis
• C)to reject the null hypothesis for a two-tailed test,but to retain the null hypothesis for an upper-tailed test
• D)to reject the null hypothesis for an upper-tailed test,but to retain the null hypothesis for a two-tailed test

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