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Statistics for Data Science II, End Term

May 2022 term, 7 Aug 2022, Set QPD1

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Figure from the original question paper Figure from the original question paper The standard deviation of the length of bolts manufactured by a machine was 1 mm. A new machine with a supposedly lesser standard deviation is installed. A random sample of 100 bolts from the new machine showed a standard deviation of 0.5 mm. Based on this data, what is your conclusion at a significance level of 0.05, on the standard deviation of length of bolts manufactured by the new machine? Choose the correct options from the following (Select all that apply):