Statistical Data Analysis

A manufacturing firm currently receives supplies of raw materials from Supplier A. They have
recently been approached by Supplier B, so the firm will
continue to use Supplier A unless they have significant evidence that the mean delivery time for
Supplier B is lower.
The SAS data set Delivery.sas7bdat contains data relating to a representative sample of 80
deliveries, 50 by supplier A and 30 by Supplier B.
Obtain the sample mean and standard deviation of the delivery time for each supplier, and
briefly interpret your findings.
It is planned to conduct a statistical test to compare the mean delivery times of the two
suppliers. What distributional assumptions regarding the populations underlying the data must
be made in order for a parametric statistical test to be valid? Investigate the tenability of these
assumptions via appropriate data plots.

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