. If a hypothesis test is between two variances or standard deviation, a chi-squared test is required. True or False 2.State the null hypothesis if an engine company believes that their products last at least 5 years on average. a.   H0 : σ2 > 5 years b. H0 : p > 5 years c. H0 : µ > 5 years d.     H0 : σ > 5 years 3. What is the upper limit interval of a two-tailed, 99% confidence level test on a sample size of 140 if the mean is 5.5 with a standard deviation of .82? Hint: use 2.33 as your z value.

Q: 15

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