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Historically, the average time it takes Jessica to swim the 200 meter butterfly is 148.4 seconds. Jessica would like to know if her average time has changed. She records her time on 50 randomly selected occasions and computes the mean to be 147.8 seconds with a standard deviation of 2.3 seconds.
The hypotheses to be tested are:
Ho mu=148.4 vs. Ha: mu not equal 148.4
What is the test statistic T rounded to two decimals?
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What is the probability of getting the first questions correct and miss the fourth with five possible answers to each question?
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A precision parts manufacturer produces bolts for use in military aircraft. The specifications for bolt length are 37.50 ± 0.25 cm. The company has established an -chart and an R-chart using samples of size five.
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