The Head Circumference Is Measured for a Sample of 15

The head circumference is measured for a sample of 15 girls and a separate sample of 15 boys. What is the correct combination of degrees of freedom and the value of the multiplier t* for a 90% confidence interval for the difference in mean head circumference between girls and boys?

A) df = 13, t* = 1.77
B) df = 28, t* = 1.70
C) df = 28, t* = 2.05
D) df = 30, t* = 1.70

Correct Answer:

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