Question 1

Which of the following best describes the difference between a population and a sample in statistics?

Accepted Answer

A population includes all members of a group, while a sample includes only some members.

Question 2

A researcher collects the heights of all students in a university. The average height calculated is an example of which of the following?

Accepted Answer

Parameter

Question 3

Which image best represents a sample selected from a population?

Accepted Answer

The first image (red and blue people, blue circle inside red circle)

Question 4

Which of the following is an example of qualitative data?

Accepted Answer

The favorite color of each student in a class

Question 5

A survey records the number of siblings each student has. What type of data is this?

Accepted Answer

Quantitative; Discrete

Question 6

Which of the following is NOT an example of quantitative data?

Accepted Answer

The brands of smartphones owned by students

Question 7

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

Accepted Answer

Interval

Question 8

Which level of measurement allows for meaningful ratios and has a true zero point?

Accepted Answer

Ratio

Question 9

A hospital records the birth weights of newborns. What type and level of data is this?

Accepted Answer

Quantitative; Ratio

Question 10

A student rates their satisfaction with a course on a scale from 1 (very dissatisfied) to 5 (very satisfied). What is the level of measurement?

Accepted Answer

Ordinal

Question 11

A scientist records the years in which different species were discovered. What is the level of measurement for these data?

Accepted Answer

Interval

Question 12

Which of the following best describes an experiment?

Accepted Answer

Applying a treatment and measuring its effects

Question 13

A company randomly selects every 10th product off the assembly line for quality testing. What type of sampling method is this?

Accepted Answer

Systematic Sampling

Question 14

A university divides students into undergraduates and graduates, then randomly selects 50 from each group. What sampling method is this?

Accepted Answer

Stratified Sampling

Question 15

A bakery tests every 12th cookie that comes out of the oven. Which sampling method is being used?

Accepted Answer

Systematic Sampling

Question 16

A researcher wants to know if a new medication causes a reduction in blood pressure. They randomly assign 20 patients to receive the medication and 20 to receive a placebo, then compare results. What type of study is this, and can causation be inferred?

Accepted Answer

Experiment; causation can be inferred

Question 17

A store manager surveys all customers who enter the store on a randomly chosen day to ask about their shopping experience. Is this a simple random sample? Is it likely to be representative?

Accepted Answer

No; No

Question 18

A quality control manager randomly selects three cases of products and tests every item in those cases. What type of sampling method is this?

Accepted Answer

Cluster Sampling

Question 19

Which of the following is a multi-step process for generating a simple random sample of 5 students from a class of 20?

Accepted Answer

Assign each student a number from 1 to 20, use a random number generator to select 5 unique numbers, and survey those students.

Question 20

A researcher records the favorite menu item of each customer at a diner. What is the level of measurement for this data?

Accepted Answer

Nominal

Introductory Statistics: Foundations and Data Collection

Guida di studio - Domande di pratica

Study guide - Flashcard