Comment on skewness and outliers

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Reference no: EM131431827

A summer language institute for teachers. A matched pairs study of the effect of a summer language institute on the ability of teachers to comprehend spoken French had these improvements in scores between the pretest and the posttest for 20 teachers:

2

0

6

6

3

3

2

3

-6

6

6

6

3

0

1

1

0

2

3

3

We wonder if the median reading differs significantly from the true value, 105.

(a) Graph the data, and comment on skewness and outliers. A rank test is appropriate.

(b) We would like to test hypotheses about the median reading from home radon detectors:

H0 : median = 105

Ha : median ≠ 105

To do this, apply the Wilcoxon signed rank statistic to the differences between the observations and 105. (This is the one-sample version of the test.) What do you conclude?

Reference no: EM131431827

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