Question 1

A researcher wants to study the heights of eggplant plants in Mr. Leonardo’s greenhouse. There are 35 eggplant plants in total, and she measures the heights of 4 randomly selected plants. Which of the following correctly identifies the population and the sample?

Accepted Answer

Population: The 35 eggplant plants at Mr. Leonardo’s greenhouse. Sample: The 4 eggplant plants measured.

Question 2

A study surveyed 800 Americans about their exercise habits and outlook on life. Which of the following best describes the population for this study?

Accepted Answer

All Americans

Question 3

The number of French fries in each of 40 individual servings is recorded. Which of the following best describes the level of measurement for this data?

Accepted Answer

$	ext{Ratio}$

Question 4

You toss a coin and record 'head' as 1 and 'tail' as 2. What is the highest level of measurement for this data?

Accepted Answer

$	ext{Ordinal}$

Question 5

A pollster interviews every member from each of five randomly chosen neighborhoods throughout a city. What sampling technique is being used?

Accepted Answer

Cluster Sampling

Question 6

A biologist hand-selects the last fifteen members to leave to be studied in depth. What sampling technique is this?

Accepted Answer

Convenience Sampling

Question 7

In an experiment, only the participant does not realize whether they have been placed in the control or experimental group. What type of experiment is this?

Accepted Answer

Single-blind

Question 8

A car wash operator wants to find out if providing a discount for local residents will generate additional revenue. What type of study is appropriate?

Accepted Answer

Experimental

Question 9

Consider the following data representing the price of refrigerators (in dollars): 1459, 1381, 1347, 1485, 1473, 1479, 1306, 1221, 1402, 1366, 1205, 1431, 1427, 1490, 1209, 1260, 1296, 1204, 1487, 1343, 1358. What is the class width if the frequency table uses classes 1196–1245, 1246–1295, etc.?

Accepted Answer

$50$

Question 10

A bar graph shows the per capita personal incomes for six states in 2004. If the lowest income is $28,000 and the highest is $36,000, what is the range of per capita incomes?

Accepted Answer

$8,000$

Question 11

A circle graph shows that 18.1% of books sold at a store are travel books. If the store sells 1300 books per month, how many travel books are sold each month (rounded to the nearest integer)?

Accepted Answer

$235$

Question 12

Given the stem-and-leaf plot below, what is the weight of the heaviest person in the group?
Stem: 16 | Leaves: 2, 4, 4, 5, 7
Key: 8 | 1 = 81 pounds

Accepted Answer

$167$

Question 13

A manufacturing company ships orders that need to weigh between 184 and 185 pounds. If the dot plot shows 5 dots between 184 and 185, how many orders did the company ship in that range?

Accepted Answer

$5$

Question 14

Which graph best illustrates a distribution shape that is skewed to the left?

Accepted Answer

A histogram with a long tail on the left and most data on the right

Question 15

Consider the data set: $7, 8, 13, 7, 7, 6, 15$. What is the mean of the data?

Accepted Answer

$8.71$

Question 16

For the data set $7, 8, 13, 7, 7, 6, 15$, what is the median?

Accepted Answer

$7$

Question 17

For the data set $7, 8, 13, 7, 7, 6, 15$, is the data set unimodal, bimodal, multimodal, or has no mode?

Accepted Answer

Unimodal

Question 18

Given the data set $7, 10, 12, 2, 9, 14$, what is the sample variance? (Round your answer to one decimal place)

Accepted Answer

$17.2$

Question 19

Given the data set $7, 10, 12, 2, 9, 14$, what is the sample standard deviation? (Round your answer to one decimal place)

Accepted Answer

$4.1$

Question 20

A political strategist assigns identification numbers to a population, then picks a random starting point and chooses every tenth member. What sampling technique is this?

Accepted Answer

Systematic Sampling

Fundamental Concepts and Applications in Introductory Statistics

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