Question 1

Which of the following best describes the four elements of a descriptive statistics problem?

Accepted Answer

Population or sample, variables, summary tools, identification of patterns

Question 2

A researcher wants to study the effect of a new fertilizer on plant growth. She randomly assigns plants to two groups: one receives the new fertilizer, the other does not. Which method of data collection is being used?

Accepted Answer

Designed experiment

Question 3

Which of the following variables is qualitative?

Accepted Answer

Location (e.g., 'Florida', 'Georgia')

Question 4

A representative sample is crucial for inferential statistics because:

Accepted Answer

It allows for accurate inferences about the population

Question 5

Which of the following is an example of a process, as defined in statistics?

Accepted Answer

An assembly line producing cars

Question 6

A survey is conducted to estimate the proportion of U.S. residents who believe the president is doing a good job. Which of the following is the variable of interest?

Accepted Answer

The view of each U.S. resident (good or bad job)

Question 7

Which of the following best describes nominal data?

Accepted Answer

Data that consist of categories with no meaningful order

Question 8

In a study of bridge characteristics, which variable is qualitative?

Accepted Answer

Condition (e.g., 'good', 'fair', 'poor')

Question 9

A company sends out a survey to a subset of its customers to rate delivery speed, invoice accuracy, and packaging quality. The company uses the mean ratings from the sample to estimate the mean ratings for all customers. This is an example of:

Accepted Answer

Inferential statistics

Question 10

Which of the following statements about survey samples is correct?

Accepted Answer

Survey responses may be biased if only those with strong opinions respond

Question 11

A researcher collects data from all U.S. Treasury records in 1861 to describe its financial condition. This study is best classified as:

Accepted Answer

Descriptive statistics

Question 12

Which of the following is a quantitative variable?

Accepted Answer

Length of bypass or detour (e.g., 1 mile, 4 miles)

Question 13

A college student is randomly assigned to a group in a recycling study. The type of condition and type of disposal are both recorded. What type of variables are these?

Accepted Answer

Both are qualitative

Question 14

Which of the following is a potential problem when using a sample to make inferences about a population?

Accepted Answer

The sample may not be representative of the population

Question 15

A random number generator is used to select 900 intersections from a city grid of 500 rows and 1,000 columns. Which sampling method is being used?

Accepted Answer

Random sampling

Question 16

In a study of accounting alumni, which variable would produce quantitative data?

Accepted Answer

Income

Question 17

A survey asks bank presidents to rate their agreement with a statement on a scale from 1 (strongly disagree) to 5 (strongly agree). What type of data is produced?

Accepted Answer

Ordinal qualitative data

Question 18

Which of the following is NOT a method of data collection described in the study materials?

Accepted Answer

Inferential survey

Question 19

A process is best defined as:

Accepted Answer

A series of actions or operations that transform inputs to outputs

Question 20

A researcher wants to estimate the mean delivery time for all future online orders based on a sample. Which statistical approach is being used?

Accepted Answer

Inferential statistics

Statistics, Data, and Statistical Thinking: Mini-Textbook Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드