Question 1

Which level of measurement is most appropriate for the number of births recorded at four hospitals (values: 1, 1438, 66, 413)?

Accepted Answer

Ratio

Question 2

In a study, birth weights of newborn babies are given in grams. Are these birth weights considered discrete or continuous data?

Accepted Answer

Continuous data

Question 3

A survey found that 26% of 1019 randomly selected adults had no credit cards. Is the value 26% a statistic or a parameter?

Accepted Answer

Statistic

Question 4

Which of the following best describes the level of measurement for birth weights (in grams)?

Accepted Answer

Ratio

Question 5

In a frequency distribution for chocolate chip cookies, the first class is 18–20 and the next is 21–23. What is the class width?

Accepted Answer

$$3$$

Question 6

Given the following sleep times (hours): 8, 7, 5, 7, 4, 7, 6, 7, 8, 8, 8, 6. What is the mean sleep time? (Round to 1 decimal place)

Accepted Answer

$$6.8$$

Question 7

For the sleep times data: 8, 7, 5, 7, 4, 7, 6, 7, 8, 8, 8, 6, what is the mode?

Accepted Answer

$$7$$

Question 8

If the sleep time of 0 hours is included in the sample data, is it an outlier? Why or why not?

Accepted Answer

Yes, because it is much lower than the other values and falls below $$Q_1 - 1.5$$ 	imes IQR$$

Question 9

Twenty body temperatures (°F) are listed. If you construct a frequency distribution with a class width of $$0.5$$ and a starting value of $$97.0$$, what is the lower class boundary of the first class?

Accepted Answer

$$96.75$$

Question 10

In a histogram of body temperatures, which feature would indicate the presence of an outlier?

Accepted Answer

A bar separated from the rest of the distribution

Question 11

Given the prediction errors (minutes): 4, -7, 0, 1, -1, 1, -4, -7, 22, 7, -5, 1. What is the five-number summary?

Accepted Answer

Min: $$-7$$, Q1: $$-4$$, Median: $$1$$, Q3: $$7$$, Max: $$22$$

Question 12

If a large sample of sleep times ranges from a low of 4 hours to a high of 10 hours, estimate the standard deviation using the range rule of thumb.

Accepted Answer

$$\frac{10 - 4}{4} = 1.5$$

Question 13

For the sleep times data, what is the z-score corresponding to a sleep time of 5 hours? (Mean = $$6.8$$, SD = $$1.3)$$

Accepted Answer

$$z = \frac{5 - 6.8}{1.3} = -1.38$$

Question 14

Which of the following is NOT a characteristic of ratio level data?

Accepted Answer

It can be used for categorical data

Question 15

In the context of the NHANES survey, if subjects are asked how long they slept the previous night, what type of study is this?

Accepted Answer

Observational study

Question 16

If you are given a frequency distribution but not the original data values, which of the following can you NOT determine?

Accepted Answer

The exact values of the original data

Question 17

Which of the following best describes the difference between categorical and quantitative data?

Accepted Answer

Quantitative data represents numerical values, categorical data represents groupings or categories

Question 18

If a sample of 80 sleep times is collected, approximately how many of those times are less than $$Q_3$$?

Accepted Answer

$$60$$

Question 19

Which of the following is a real-world example of interval level data?

Accepted Answer

Temperature measured in degrees Fahrenheit

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