Question 1

Which of the following best describes the variable 'make of car' (e.g., Honda, Ford, Toyota) recorded by a researcher from 200 commuters?

Accepted Answer

Qualitative

Question 2

A researcher wants to estimate the average income of all residents in a city. She randomly selects 10 neighborhoods, then surveys every household in those neighborhoods. What sampling method is she using?

Accepted Answer

Cluster sampling

Question 3

Which level of measurement is represented by 'calendar year'?

Accepted Answer

Interval

Question 4

A survey of 100 randomly selected students found that 60% prefer online classes. The value 60% is:

Accepted Answer

A statistic, because 100 students is a sample

Question 5

Which of the following is an example of a continuous variable?

Accepted Answer

Time spent studying

Question 6

A researcher selects every 10th person from a list of conference attendees. What sampling method is this?

Accepted Answer

Systematic sampling

Question 7

Which of the following best describes the distribution shown in the Yelp Ratings for Hot Doug’s (most ratings are 5 stars, with fewer at lower ratings)?

Accepted Answer

Skewed left

Question 8

Which measure of central tendency is most appropriate for a distribution that is highly skewed by a few extreme values?

Accepted Answer

Median

Question 9

A frequency distribution has a minimum value of 10 and a maximum value of 70. If you want 5 classes, what is the class width?

Accepted Answer

$$ (70 - 10) \div 5 = 12 $$, but you must round UP to 12

Question 10

Which of the following is a resistant statistic?

Accepted Answer

Median

Question 11

A researcher wants to know if a new medication causes lower blood pressure. She randomly assigns patients to receive either the medication or a placebo, then measures their blood pressure. What type of study is this?

Accepted Answer

Designed experiment

Question 12

Which of the following best describes the relationship between mean and median in a distribution that is skewed right?

Accepted Answer

Mean \u003e Median

Question 13

A frequency distribution table lists the number of students in each grade (A, B, C, D, F) in a class. What type of distribution is this?

Accepted Answer

Frequency distribution

Question 14

A survey asks, 'Don’t you agree that our school needs a new gym?' Which type of bias is most likely present?

Accepted Answer

Response bias

Question 15

A group of 5 friends spends the following amounts on groceries: $$40, 45$$, $$45, 50$$, $220. What is the sample mean?

Accepted Answer

$$ \frac{40 + 45 + 45 + 50 + 220}{5} = 80 $$

Question 16

Which of the following best describes the variable 'number of emails received in a day'?

Accepted Answer

Quantitative and discrete

Question 17

A sample is considered to have under-representation when:

Accepted Answer

A subgroup makes up a smaller proportion of the sample than in the population

Question 18

Which of the following is true about a perfectly symmetric and unimodal distribution?

Accepted Answer

Mean = Median = Mode

Question 19

A researcher divides a population into groups based on age (e.g., 18-29, 30-39, 40-49), then randomly selects some individuals from each group. What sampling method is this?

Accepted Answer

Stratified sampling

Question 20

Which of the following best describes the graph 'Most Popular Ways to Save for College' (with dollar signs of different sizes and percentages)?

Accepted Answer

It is misleading because the size of the dollar signs exaggerates the differences.

Statistics Test 1 Review: Practice Questions and Step-by-Step Guidance

Guida di studio - Domande di pratica

Study guide - Flashcard