Unit 8 Test Review (AP Statistics, Period 3) - Mr. Kurten

What is the point estimate from this sample?

• Sample mean

• Sample standard deviation

• Population mean

• Population standard deviation

What is the margin of error?

• Half the width of the interval, 8 bushels

• The whole interval, 16 bushels

• Half the width of the interval, 6 bushels

• The whole interval, 12 bushels

Interpreting the 99% confidence interval yields the conclusion that we are 99% confident that the interval from 118 to 130 bushels per acre captures the ____ ____ _____ of this variety of corn in all possible plots.

If, instead of constructing a 95% confidence interval, the physician constructed a 90% confidence interval, would the 90% interval be wider, narrower, or the same width as the 95% interval?

• Wider

• The same width

• Larger

• Narrower

If the physician took a larger sample size, the standard deviation of the sampling distribution would be _______, so the confidence interval will be narrower.

What is the parameter our confidence interval will estimate?

• Unemployment rates

• Compensation rates for unemployed Americans

• Proportion of adults who feel that unemployment should be extended 6 months

• Current economic downturn of the United States

Identify the conditions that must be met to use this procedure.

• Random, less than 10% of population, large counts

• Non-random, less than 10% of population, small counts

• Random, more than 50% of population, small counts

• Non-random, more than 50% of population, large counts

Find the appropriate critical value and standard error of the sample proportion.

• z* = 1.645, SE = 0.0357

• z* = 1.96, SE = 0.0114

• z* = 1.282, SE = 0.0598

• z* = 1.96, SE = 0.1784

Give the 95% confidence interval.

• (0.345, 0.397)

• (0.206, 0.265)

• (0.289, 0.372)

• (0.258, 0.302)

In interpreting the confidence interval, we are 95% confident that the interval from 0.258 to 0.302 contains the ____ __________ of adults who feel unemployment should be extended 6 months.