Use the following information to answer Questions 1 and 2 In order to estimate the time...
Use the following information to answer Questions 1 and 2
In order to estimate the time taken by students to solve a problem in a particular statistics class, the teacher observes, randomly, the time taken by 5 students. The mean and standard deviation of the sample are 12.2 minutes and 2.7 minutes. Assume that the times are normally distributed.
1)Find the number tα/2 needed in construction of a 95% confidence interval.
a. 2.015
b. 2.132
c. 2.571
d. 2.576
e. 2.776
2) Construct the 95% confidence interval for the mean time taken by all the students in this statistics class.
a. [8.85, 15.55]
b. [9.09, 15.31]
c. [9.10, 15.30]
d .[9.63, 14.77]
e .[9.77, 14.63]
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Use the following information to answer Questions 1 and 2
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college transfer students take longer to attain a bachelor's
degree? Use an α = 0.05 level of significance. Perform a hypothesis
test. Determine the null and alternative hypotheses.
(b) Determine the test statistic (t =
?) and the P-value (P = ?). Round to two decimal
places as needed.
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approximate the mean additional time it takes to complete a
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