Question 1

Which of the following is the best example of a continuous quantitative variable?

Accepted Answer

The current GPA of a student

Question 2

A frequency table for a quantitative variable includes which of the following columns?

Accepted Answer

Frequency, Relative Frequency, Percent of Total, Cumulative Percent of Total

Question 3

Given the dataset: $$6, 8, 14, 18, 23, 30$$, what is the range?

Accepted Answer

$$27$$

Question 4

Which measure of center is most affected by an outlier?

Accepted Answer

Mean

Question 5

A dataset has a mean of $$50$$ and a standard deviation of $$10. $$According to the Empirical Rule, approximately what percentage of data falls between $$30$$ and $$70$$?

Accepted Answer

$$68\%$$

Question 6

Which of the following best describes a right-skewed (positively skewed) distribution?

Accepted Answer

The mean is greater than the median

Question 7

If a value in a dataset has a z-score of $$-2.5$$, what does this indicate?

Accepted Answer

The value is $$2.5$$ standard deviations below the mean

Question 8

Which of the following is NOT a resistant measure of center or spread?

Accepted Answer

Mean

Question 9

A box-and-whisker plot is constructed using which summary statistics?

Accepted Answer

Minimum, First Quartile, Median, Third Quartile, Maximum

Question 10

Given a dataset with a mean of $$100$$ and a standard deviation of $$20$$, what is the z-score for a value of $$160$$?

Accepted Answer

$$3$$

Question 11

Which type of graph is most appropriate for displaying the distribution of a single categorical variable?

Accepted Answer

Bar Graph

Question 12

If a value is more than three standard deviations away from the mean, it is considered:

Accepted Answer

An outlier

Question 13

Which of the following best describes the interquartile range (IQR)?

Accepted Answer

The difference between the first and third quartiles

Question 14

A dataset is summarized as follows: Minimum = $$10$$, $$Q_1 = 20$, Median = 30$, Q_3$ = 40$$, Maximum = $$100. $$Which value is most likely an outlier?

Accepted Answer

$$100$$

Question 15

Which of the following is a correct interpretation of a relative frequency of $$0.25$$ for a class in a frequency table?

Accepted Answer

The class contains $$25\% of $$the data

Question 16

A study finds that the amount of money spent per day on Spring Break is normally distributed with a mean of $$100$$ and a standard deviation of $$50. $$According to the Empirical Rule, between which two values will $$95\% of $$the data fall?

Accepted Answer

$$0$$ and $$200$$

Question 17

Which of the following is NOT a characteristic used to describe the shape of a distribution?

Accepted Answer

Mean

Question 18

If a dataset is left-skewed, which of the following is most likely true?

Accepted Answer

Mean \u003c Median

Question 19

Which of the following best explains why the sum of deviations from the mean is always zero?

Accepted Answer

Because positive and negative deviations from the mean always balance each other

Question 20

A sample of $$8$$ shoppers has the following number of items purchased: $$6, 8, 14, 18, 23, 30, 35, 100. $$Which measure of center would be least affected if the value $$100$$ was replaced by $$1000$$?

Accepted Answer

Median

Chapter 2: Displays and Summaries – STAT 201 Elementary Statistics

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