AP Stat 7.1 Quick Review

The average annual salary for 35 of a company's 1200 accountants is $68,000.

• parameter
• statistic

Sixty-two of the 97 passengers aboard the Hindenburg airship survived its explosion.

• parameter
• statistic

In a survey of a sample of computer users, 8% said their computer had a malfunction that needed to be repaired by a service technician.

• parameter
• statistic

In  a recent year, the average math scores for all graduates on the ACT was 21.1.

• parameter
• statistic

What word best describes this definition: the group of individuals that we’d like to know about.

• Population

• Sample

• Parameter

• Statistic

What word best describes this definition: a numerical value that describes the population. Mean or average from the population, denoted µ (mu).

• Population

• Sample

• Parameter

• Statistic

What word best describes this definition: the subset of the population that is actually studied.

• Population

• Sample

• Parameter

• Statistic

What word best describes this definition: a numerical value that is calculated from a sample. Mean or average from the sample, denoted x̄ (x-bar).

• Population

• Sample

• Parameter

• Statistic

The following graphs show the sampling distributions for two different point estimators, R and W, of the same population parameter.

Which of the following statements is true?

• Both R and W are unbiased.

• R is biased, and W is unbiased

• Both R and W are biased.

• R is unbiased, and W is biased.

• The assessment of bias is not possible, because the sampling distributions display too much variability.

These symbols represent the mean and standard deviation for which of the following distributions?

• The Population
• The Sample
• The Sampling Distribution