BUSINESS STATISTICS AND ANALYTICS IN
PRACTICE BOWERMAN COMPREHENSIVE
STUDY QUESTIONS AND ANSWERS
◉ A sample of size 25 is drawn from a normal population with a
population standard deviation of 100. Suppose the mean of the
sample is xx = 35. Recall that z0.025=1.96. A 95% confidence
interval for the population mean is equal to.
Answer: 35±1.96100√25
◉ The sampling distribution of estimator xx follows a normal
distribution when the sample size is large enough. As a rule-of-
thumb, we use the following.
Answer: n ≥30.
◉ Suppose we wish to derive a confidence interval for the mean of a
right-skewed population. In order to derive a valid confidence
interval for μ, xx must be based on a sample which.
Answer: has size n≥30
◉ How is a confidence interval for the mean different from a point
estimate of the mean?.
,Answer: The point estimate is the single number xx while a
confidence interval is an entire interval of values which is intended
to contain μ.
◉ A 95% confidence interval for the population mean implies that if
samples are drawn repeatedly and confidence intervals for μ are
constructed, then.
Answer: 95% of the confidence intervals computed will contain the
population mean.
◉ A 95% confidence interval for the population mean is calculated
as [40, 80]. The margin of error for this interval is.
Answer: 20
◉ A 95% confidence interval for the population mean is calculated
as [40, 80]. The point estimate for μ is.
Answer: 60
◉ A 95% confidence interval for the population mean is constructed
as 6±2. What is the point estimate of μ?.
Answer: 6
◉ A 95% confidence interval for the population mean is constructed
as 6±2. What is the confidence coefficient?.
, Answer: .95
◉ A 95% confidence interval for the population mean is constructed
as 6±2. What is the probability of error, α?.
Answer: .05
◉ If samples of size n are drawn repeatedly from a given population
and each sample is used to construct a 95% confidence interval for
μ.
Answer: 5% of the confidence intervals will fail to contain μ.
◉ Regardless of the sample size, the estimator xx follows a normal
distribution when the underlying population follows a distribution..
Answer: Normal
◉ The confidence level equals.
Answer: 1-a
◉ In order to construct a confidence interval for μ, the sampling
distribution of the estimator xx must follow or approximately follow
a(n) ______ distribution.
Answer: Normal
PRACTICE BOWERMAN COMPREHENSIVE
STUDY QUESTIONS AND ANSWERS
◉ A sample of size 25 is drawn from a normal population with a
population standard deviation of 100. Suppose the mean of the
sample is xx = 35. Recall that z0.025=1.96. A 95% confidence
interval for the population mean is equal to.
Answer: 35±1.96100√25
◉ The sampling distribution of estimator xx follows a normal
distribution when the sample size is large enough. As a rule-of-
thumb, we use the following.
Answer: n ≥30.
◉ Suppose we wish to derive a confidence interval for the mean of a
right-skewed population. In order to derive a valid confidence
interval for μ, xx must be based on a sample which.
Answer: has size n≥30
◉ How is a confidence interval for the mean different from a point
estimate of the mean?.
,Answer: The point estimate is the single number xx while a
confidence interval is an entire interval of values which is intended
to contain μ.
◉ A 95% confidence interval for the population mean implies that if
samples are drawn repeatedly and confidence intervals for μ are
constructed, then.
Answer: 95% of the confidence intervals computed will contain the
population mean.
◉ A 95% confidence interval for the population mean is calculated
as [40, 80]. The margin of error for this interval is.
Answer: 20
◉ A 95% confidence interval for the population mean is calculated
as [40, 80]. The point estimate for μ is.
Answer: 60
◉ A 95% confidence interval for the population mean is constructed
as 6±2. What is the point estimate of μ?.
Answer: 6
◉ A 95% confidence interval for the population mean is constructed
as 6±2. What is the confidence coefficient?.
, Answer: .95
◉ A 95% confidence interval for the population mean is constructed
as 6±2. What is the probability of error, α?.
Answer: .05
◉ If samples of size n are drawn repeatedly from a given population
and each sample is used to construct a 95% confidence interval for
μ.
Answer: 5% of the confidence intervals will fail to contain μ.
◉ Regardless of the sample size, the estimator xx follows a normal
distribution when the underlying population follows a distribution..
Answer: Normal
◉ The confidence level equals.
Answer: 1-a
◉ In order to construct a confidence interval for μ, the sampling
distribution of the estimator xx must follow or approximately follow
a(n) ______ distribution.
Answer: Normal
