Q: Which of the following is the correct formula for calculating class width in a histogram?

$$\text{Class Width} = \frac{\text{Max} - \text{Min}}{\text{Number of Classes}}$$

Question 1

Which of the following best describes a 'designed experiment' as a method of data collection?

Accepted Answer

Researchers impose a treatment on individuals and observe their responses.

Question 2

A company wants to estimate the average salary of its employees. It divides employees into departments and randomly selects 5 employees from each department. What type of sampling method is this?

Accepted Answer

Stratified random sample

Question 3

Which of the following is an example of response bias in a survey?

Accepted Answer

Respondents give misleading answers due to the sensitive nature of the question.

Question 4

A bar graph is most appropriate for displaying which type of data?

Accepted Answer

Qualitative (categorical) data

Question 5

Given the following histogram shapes, which one represents a right-skewed (positively skewed) distribution?

Accepted Answer

A distribution with a long tail to the right

Question 6

A survey is sent to all students at a university, but only those who feel strongly about the topic respond. What type of sample is this?

Accepted Answer

Voluntary response sample

Question 7

Which of the following is the correct formula for calculating class width in a histogram?

Accepted Answer

$$	ext{Class Width} = \frac{	ext{Max} - 	ext{Min}}{	ext{Number of Classes}}$$

Question 8

A researcher selects 10 schools at random, then randomly selects 5 students from each school. What sampling method is this?

Accepted Answer

Stratified random sample

Question 9

Which of the following is NOT a potential problem with sampling?

Accepted Answer

Random selection

Question 10

A dotplot is most useful for which type of data set?

Accepted Answer

A small data set with relatively few distinct values

Question 11

Which of the following best describes the difference between a parameter and a statistic?

Accepted Answer

A parameter is a numerical summary of a population; a statistic is a numerical summary of a sample.

Question 12

A company wants to know the average age of marathon finishers in the US, but only collects data from the NYC marathon. What is the main issue with generalizing their results?

Accepted Answer

Undercoverage

Question 13

Which of the following is a quantitative variable?

Accepted Answer

Annual salary

Question 14

In the context of business analytics, what is the main purpose of statistical thinking?

Accepted Answer

To apply rational thought and statistical methods to critically assess data and inferences

Question 15

Which of the following graphs would be most appropriate to display the distribution of the number of cars owned by households in a city?

Accepted Answer

Histogram

Question 16

A histogram with a very large number of bins (e.g., 40 bins for 50 data points) is likely to:

Accepted Answer

Be too detailed and show too much random variation

Question 17

Which of the following is an example of available data?

Accepted Answer

A researcher uses salary data from the U.S. Bureau of Labor Statistics website.

Question 18

Which of the following best describes a cluster sample?

Accepted Answer

Dividing the population into groups and randomly selecting some groups, then sampling all individuals in those groups

Question 19

A survey question asks, 'Don't you agree that our product is the best?' What type of survey error is this?

Accepted Answer

Poorly worded question

Question 20

Which of the following is NOT a characteristic used to describe the overall pattern of a histogram?

Accepted Answer

Color

Statistical Thinking and Methods for Describing Data

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