Comment on skewness and outliers

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

H_a : 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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