Incorrect

The question was: The F statistic for this test is: ?

Your Answer: 0.35

Answer and explanation: Your answer is incorrect. The correct answer is 2.86.
To determine the F statistic you need to know the variance of each of the groups. The variance of a group can be found by squaring the standard deviaton. The standard deviation for the treatment group is 3.14, so the variance is 9.87. The standard deviation of the control group is 1.86, so the variance is 3.45. To find the F statistic you divide the larger variance by the smaller. This gives an F of 2.86. If you divide the smaller variance by the larger the result is 0.35.

Statistic

Treatment

Control

N

29

21

Mean

4.3793

8.4286

Median

4.0000

9.0000

Trimean

4.0000

9.0000

Minimum

0.0000

4.0000

Maximum

10.0000

10.0000

25th Percentile

2.0000

8.0000

75th Percentile

6.0000

10.0000

Standard Deviation

3.1443

1.8593

Standard error of mean

0.5893

0.4057

Skew

0.5037

-0.9610

Kurtosis

-0.7375

-0.2728


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