The mean age of 25 randomly selected college seniors was, Ask an Expert

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The mean age of 25 randomly selected college seniors was found to be 23.5 years, and the standard deviation of all college seniors was 1.3 years. Which of the following is the correct symbol for 1.3 years?

A. u

B. s

C. o

A researcher wishes to compare two different groups of students with respect to their mean time to complete a particular task. The time required is determined for each group. The data summary is given below. Test the claim at a = 0.05, that there is no difference in variance. Give the critical region, test statistic value, and conclusion for the F test.

n1=100, s1=20

n2=120, s2=34

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