The following data gives the pH in rain/sleet/snow for 2004-05 at 20 rural sites on the US
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Question:
The following data gives the pH in rain/sleet/snow for 2004-05 at 20 rural sites on the US west
coast.
5.335
5.345
5.395
5.305
5.315
5.38
5.52
5.19
5.455
5.33
5.36
6.285
5.35
5.125
5.115
5.51
5.34
5.34
5.305
5.265
(a) Create boxplot or histogram for this data and comment on whether sample mean or sample
median be a better descriptor of a typical pH value.
(b) Create a QQ-plot to check if normality assumption is appropriate for these data.
(c) What test will you suggest to test whether a typical pH value is 5.4 or not? Conduct the test
and conclude.
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