Question 1

A researcher collects the cholesterol levels of every patient in a hospital. Is this data set a population or a sample?

Accepted Answer

Population

Question 2

A survey of 50 randomly selected students at a university finds that the average GPA is 3.2. Is this value a parameter or a statistic?

Accepted Answer

Statistic

Question 3

Which of the following is an example of qualitative data?

Accepted Answer

The favorite ice cream flavor of each customer

Question 4

A researcher records the number of cars passing through an intersection each hour. What type of data is this?

Accepted Answer

Quantitative; Discrete

Question 5

Which of the following is NOT a quantitative data set?

Accepted Answer

The brands of laptops owned by students

Question 6

A scientist measures the temperature of a solution every minute during an experiment. What is the level of measurement for this data?

Accepted Answer

Interval

Question 7

Participants in a study are asked to rate their pain as 'none', 'mild', 'moderate', or 'severe'. What is the level of measurement for this data?

Accepted Answer

Ordinal

Question 8

Which level of measurement can describe both qualitative and quantitative data?

Accepted Answer

Ordinal

Question 9

A student claims that 80°F is twice as hot as 40°F. Why is this calculation not valid?

Accepted Answer

Because temperature in Fahrenheit is measured at the interval level and has no true zero

Question 10

A hospital records the birth weights of newborns. What is the level of measurement for this data?

Accepted Answer

Ratio

Question 11

A company wants to test if a new training program increases employee productivity. They randomly assign half the employees to the new program and the other half to the standard program, then compare results. What type of study is this, and can causation be inferred?

Accepted Answer

Experiment; causation can be inferred

Question 12

A nutritionist surveys 100 people about their eating habits and cholesterol levels, but does not intervene. What type of study is this?

Accepted Answer

Observational study

Question 13

A gym uses a random number generator to select 30 members for a survey, but all selected members happen to attend morning classes. Is this a simple random sample? Is it representative?

Accepted Answer

It is a simple random sample, but not necessarily representative

Question 14

A bakery tests every 10th cookie produced for quality. What type of sampling method is this?

Accepted Answer

Systematic sampling

Question 15

A university surveys 50 random undergraduates and 50 random graduate students. What type of sampling method is this?

Accepted Answer

Stratified sampling

Question 16

A quality control manager selects three random boxes of products at the end of the day and inspects every item in those boxes. What type of sampling method is this?

Accepted Answer

Cluster sampling

Question 17

A school principal wants to survey teachers about a new policy. She randomly selects 10 teachers from each grade level. What type of sampling method is this?

Accepted Answer

Stratified sampling

Question 18

Which of the following best describes a representative sample?

Accepted Answer

A sample that has the same characteristics in the same proportions as the population

Question 19

A researcher wants to select a simple random sample of 5 students from a class of 20. Which process would achieve this?

Accepted Answer

Assign each student a number from 1 to 20 and use a random number generator to select 5 unique numbers

Question 20

A company wants to survey employees about a new policy. They divide employees into departments and randomly select some departments, then survey all employees in those departments. What sampling method is this?

Accepted Answer

Cluster sampling

Statistics: Data Collection and Sampling Methods - Study Guide

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