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The weights of a sample of n = 8 college men will be used to create...

The weights of a sample of n = 8 college men will be used to create a 95% confidence interval for the mean weight of all college men. What is the correct t* multiplier involved in calculating the interval?

A.

2.365
B.

2.306
C.

1.895
D.

1.96
E.

2.00
math   Statistics-And-Probability   
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Answer #1

solution:

Degrees of freedom = df = n - 1 = 8 - 1 = 7

At 95% confidence level the t is ,

= 1 - 95% = 1 - 0.95 = 0.05

  / 2= 0.05 / 2 = 0.025

t /2,df = t0.025,7 =2.365 ( using student t table)

correct option a

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