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部分真題預(yù)覽：

1）Height, in meters, is measured for each person in a sample. After the data are collected, all the height measurements are converted from meters to centimeters by multiplying each measurement by 100. Which of the following statistics will remain the same for both units of measure?

The mean of the height measurements

The median of the height measurements

The standard deviation of the height measurements

The maximum of the height measurements

The z-scores of the height measurements

2) A school principal wanted to investigate student opinion about the food served in the school cafeteria. The principal selected at random samples of 50 first-year students, 50 second-year students, 50 third-year students, and 50 fourth-year students to complete a questionnaire. Which of the following best describes the principal’s sampling plan?

A stratified random sample

A simple random sample

A cluster sample

A convenience sample

A systematic sample

3) A candy company produces individually wrapped candies. The quality control manager for the company believes that the weight of the candies is approximately normally distributed with mean 720 milligrams (mg). If the manager’s belief is correct, which of the following intervals of weights will contain the largest proportion of the candies in the distribution of weights?

740 mg to 780 mg

700 mg to 740 mg

680 mg to 720 mg

660 mg to 700 mg

620 mg to 660 mg

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