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10 COMPARISON - 1 GROUP
Note
Calcula ons can be based on raw data or data that are averaged like: arithme c mean, standard devia on and sample size.
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10.1. (courier.pqs file)
You want to check if the me of awai ng for a delivery by some courier company is 3 days on the
average (µ0 = 3). In order to calculate it, there are 22 persons chosen by chance from all clients of the
company as a sample. A er that, there are wri en informa on about the number of days passed since
the delivery was sent ll it is delivered. There are following values: (1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4,
4, 5, 5, 6, 6, 6, 7, 7).
The number of awai ng days for the delivery in the analysed popula on fulfills the assump on of
normality of distribu on.
Hypotheses:
H0 : mean of the number of awai ng days for the delivery, which is supposed
to be delivered by the above-men oned courier company is 3,
H1 : mean of the number of awai ng days for the delivery, which is supposed
to be delivered by the above-men oned courier company is different from 3.
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