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Question

A researcher is estimating the average difference between two population means based on matched"‘pairs samples. She gathers data on each pair in the study resulting in:
Pair Group 1 Group 2
1 10 12
2 8 9
3 11 11
4 8 10
5 9 12

Assume that the data are normally distributed in the population. To obtain a 90% confidence interval, the table tvalue would be _______.
a) 1.86
b) 1.397
c) 1.533
d) 2.132
e) 3.346

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