Based on a Random Sample of 13 Tire Changes,the Mean

question 37

Multiple Choice

Based on a random sample of 13 tire changes,the mean time to change a tire on a Boeing 777 has a mean of 59.5 minutes with a standard deviation of 8.4 minutes.For 10 tire changes on a Boeing 787 the mean time was 64.3 minutes with a standard deviation of 12.4 minutes.To test for equal variances in a two-tailed test at  = .10,the critical values are:

• A) 3.73 and 0.228
• B) 2.51 and 3.67
• C) 3.07 and 0.398
• D) 3.07 and 0.357

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