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The design of an automotive gear requires the diameter to be 4 inches. To evaluate the...

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Statistics

The design of an automotive gear requires the diameter to be 4inches. To evaluate the production quality, you sample 30 gears andfind the average to be 4.08 with a standard deviation of 0.71.Construct a hypothesis test at a 0.05 level of significance todetermine if the gear diameter is larger than 4 inches.

Select one:

a. The critical value is 1.70, the test statistic is 0.62,conclude the gear diameter is less than or equal to 4 inches

b. The critical value is 1.70, the test statistic is 0.62,conclude the gear diameter is greater than 4 inches

c. The critical value is 2.05, the test statistic is 0.62,conclude the gear diameter is greater than 4 inches

d. The critical value is 2.05, the test statistic is 0.62,conclude the gear diameter is less than or equal to 4 inches

e. The critical value is 2.05, the test statistic is 0.62,conclude the gear diameter is not equal to 4 inches

Answer & Explanation Solved by verified expert
3.6 Ratings (510 Votes)
The correct option is aGiven in the question that the average diameter for anautomotive gear to be 4 inches So the sample of 30 gear    See Answer
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