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A pharmaceutical manufacturer does a chemical analysis to check the potency of products. The standard release potency for cephalothin crystals is 910. An assay of 16 lots gives the following potency data:
897 914 913 906 916 918 905 921
918 906 895 893 908 906 907 901
i) Check the data for outliers or strong skewness that might threaten the validity of the t-procedures.
ii) Give a 95% CI for the mean potency.
iii) Is there significant evidence at the 5% level that the mean potency is not equal to the standard release potency?
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