Q1) A confidence interval will contain the true population value as long as the

Question

Q1) A confidence interval will contain the true population value as long as the point estimate is within the lower to upper limits.

1) True

2) False

Q2) A 95 percent confidence interval estimate indicates that there is a 95 percent chance that the true population value will fall within the range defined by the upper and lower limits.

1) True

2) False

Q3) Past experience indicates that the variance in the time it takes for a "fast lube" operation to actually complete the lube and oil change for customers is 9.00 minutes. The manager wishes to estimate the mean time with 99 percent confidence and a margin of error of ± 0.50 minutes. Given this, what must the sample size be?

1) n = 139

2) n = 2149

3) n = 239

4) n = 1245

Q4) When using a 95 percent confidence interval for a mean, the area in the upper tail of the distribution that is outside the interval is 5 percent.

1) True

2) False

Explanation / Answer

Q1) True

Q2) False

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