Question 1

A researcher collects the heights of all students in a university. Is this data set a population or a sample?

Accepted Answer

Population

Question 2

A survey of 50 randomly selected patients at a hospital finds an average recovery time of 6 days. 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 color of cars in a parking lot

Question 4

A company records the number of products sold each day. 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 smartphones owned by students

Question 6

A researcher measures the temperature in a laboratory every hour. What is the level of measurement for this data?

Accepted Answer

Interval

Question 7

Participants rate their satisfaction on a scale from 1 to 5. What is the level of measurement?

Accepted Answer

Ordinal

Question 8

Which level of measurement could describe both quantitative or qualitative data?

Accepted Answer

Ordinal

Question 9

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

Accepted Answer

Ratio

Question 10

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

Accepted Answer

Because the Fahrenheit scale does not have a true zero, so ratios are meaningless

Question 11

A bakery tests every 12th cookie produced for quality. What type of sampling method is this?

Accepted Answer

Systematic sampling

Question 12

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

Accepted Answer

Stratified sampling

Question 13

A quality control manager selects three random cases of units at the end of the day and tests all units in one of the cases. What type of sampling method is this?

Accepted Answer

Cluster sampling

Question 14

A store manager wants to test whether increasing store hours increases profits. They randomly select half of their locations to stay open later and compare profits. Is this an experiment or an observational study, and can they infer causation?

Accepted Answer

Experiment; Yes, causation can be inferred

Question 15

A company uses a random number generator to select 100 of the 1500 units produced that day for quality testing. What type of sampling method is this?

Accepted Answer

Simple random sampling

Question 16

A researcher surveys the nationalities of 10 people on a plane. What type of data is this?

Accepted Answer

Qualitative

Question 17

A quality control manager selects every tenth unit produced on the line for inspection. What type of sampling method is this?

Accepted Answer

Systematic sampling

Question 18

A hospital records the dates of establishment for different businesses. What is the level of measurement?

Accepted Answer

Interval

Question 19

A professor wants to select a simple random sample of 5 students from a class of 20. Which process would ensure a simple random sample?

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 quality control manager takes 10 random units from each of 10 machines to test for defects. What type of sampling method is this?

Accepted Answer

Stratified sampling

Business Statistics: Foundations and Data Collection Concepts

Guida di studio - Domande di pratica

Study guide - Flashcard