In order to compare two kinds of feed, thirteen pigs are split into two groups,

Question

In order to compare two kinds of feed, thirteen pigs are split into two groups, and each group received one feed. The following are the gains in weight (kilograms) after a fixed period of time:

Feed A: 8.0 7.4 5.8 6.2 8.8 9.5

Feed B: 12.0 18.2 8.0 9.6 8.2 9.9 10.3

We wish to test the hypothesis that Feed B gives rise to larger weight gains. The output from JMP is as follows:

Difference

t-Test

DF

Prob > |t|

Estimate

-3.26905

** hidden **

11

0.0566

Std Error

1.53464

Lower 95%

-6.64677

Upper 95%

0.10868

Assuming equal variances

The p-value for the test is:

a. .0283

b. 2.130

c. .0566

d. .1132

e. .1087

Difference

t-Test

DF

Prob > |t|

Estimate

-3.26905

** hidden **

11

0.0566

Std Error

1.53464

Lower 95%

-6.64677

Upper 95%

0.10868

Explanation / Answer

Answer: a. .0283

It is a one-tailed test.

So the p-value= 0.0566/2 = 0.0283

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