Question

Statistics students believe that the mean score on the first statistics test is 85. A statistics instructor thinks the mean score is higher than 85. He samples ten statistics students and obtains the scores

78

84

90

83

84

83

83

84

81

88

This from the example Ch9 pg 519 use tTest

Enter the p-value

(round to 4 decimal places)

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Answer 1

The table given below ,

X
78	33.64
84	0.04
90	38.44
83	0.64
84	0.04
83	0.64
83	0.64
84	0.04
81	7.84
88	17.64

From table,

The sample mean is ,

The sample standard deviation is ,

Now ,

Hypothesis : VS ( Claim )

Here , the test is one ( right ) tailed test.

d.f.=degrees of freedom = n-1 = 10-1 = 9

The test statistic is ,

The p-value is ,

p-value = ; From excel "=TDIST(1.1407,9,1)"