Answers Mathematics III AUnit Test

Unit Test — Unit test Answers

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The difference between an observational study and an experiment is that

in an observational study, only one group is studied, and in an experiment, two groups are studied.

in an observational study, the researchers do not control treatment, and in an experiment, they do.

in an experiment, cause-and-effect is analyzed, and in an observational study, it is not.

in an experiment, one group is studied over a short period of time, and in an observational study, the group is studied over a longer period of time.

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When finding the margin of error for the mean of a normally distributed population from a sample, what is the critical probability, assuming a confidence level of 58%?

0.21

0.42

0.58

0.79

Dwayne and Alisha both correctly graphed a standard normal curve. Which of the following statements is true?

Neither the means nor the standard deviations of Dwayne’s and Alisha’s graphs must be the same.

The means of Dwayne’s and Alisha’s graphs must be the same but not the standard deviations.

The standard deviations of Dwayne’s and Alisha’s graphs must be the same but not the means.

Both the means and the standard deviations of Dwayne’s and Alisha’s graphs must be the same.

The graph below shows three different normal distributions.Which statement must be true?

Each distribution has the same mean and the same standard deviation.

Each distribution has the same mean and a different standard deviation.

Each distribution has a different mean and the same standard deviation.

Each distribution has a different mean and a different standard deviation.

The hourly wages earned by 20 employees are shown in the first box-and-whisker plot below. The person earning $15 per hour quits and is replaced with a person earning $8 per hour. The graph of the resulting salaries is shown in plot 2.Plot 1 Plot 2 How does the mean and median change from plot 1 to plot 2?

The mean and median remain the same.

The mean decreases, and the median remains the same.

The mean remains the same, and the median decreases.

The mean and median decrease.

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