Q: A frequency histogram shows the heart rates of participants. If 13 out of 39 participants had a heart rate between 130 and 150 bpm, what percent of participants is this?

$$\frac{13}{39} \times 100 = 33\%$$

Question 1

Which of the following correctly describes the relationship between a parameter and a statistic?

Accepted Answer

A statistic is calculated from sample data and is generally used to estimate a parameter.

Question 2

A study was done to determine the average commute time per week to and from class for an SPC student attending a lecture class. For convenience, a sample of 60 students was taken by randomly selecting 30 students on the Gibbs campus and 30 students on the Clearwater campus. Who is the population in this study?

Accepted Answer

All SPC students.

Question 3

Which branch of statistics deals with the organization and summarization of collected information?

Accepted Answer

Descriptive

Question 4

From past figures, it is predicted that 19% of the registered voters in California will vote in the June primary. Is this statement inferential or descriptive?

Accepted Answer

Inferential

Question 5

Classify the variable 'Eye Color' as qualitative or quantitative.

Accepted Answer

Qualitative

Question 6

A study where a drug was given to 23 patients and a placebo to another group of 23 patients to determine if the drug has an effect on a patient’s illness. What is the best method of data collection?

Accepted Answer

Experiment

Question 7

A political pollster wishes to determine if his candidate is leading in the polls for an upcoming election. Which method of data collection should be used?

Accepted Answer

Survey

Question 8

50 sophomores, 30 juniors, and 20 seniors are randomly selected from 500 sophomores, 300 juniors, and 200 seniors at a certain high school. What sampling method is used?

Accepted Answer

Stratified

Question 9

At a local community college, five statistics classes are randomly selected out of 20 and all of the students from each class are interviewed. What sampling method is used?

Accepted Answer

Cluster

Question 10

A community college student interviews everyone in a statistics class to determine the percentage of students that own a car. What sampling method is used?

Accepted Answer

Convenience

Question 11

A frequency histogram shows the heart rates of participants. If 13 out of 39 participants had a heart rate between 130 and 150 bpm, what percent of participants is this?

Accepted Answer

$$\frac{13}{39} 	imes 100 = 33\%$$

Question 12

Given the data set: 71, 67, 67, 72, 76, 72, 73, 68, 72, 72. What is the mean?

Accepted Answer

$$\frac{71+67+67+72+76+72+73+68+72+72}{10} = 71$$

Question 13

Given the data set: 71, 67, 67, 72, 76, 72, 73, 68, 72, 72. What is the mode?

Accepted Answer

$$72$$

Question 14

The median LSAT score reported by a Law School is 170. Which of the following is NOT correct?

Accepted Answer

Half of the students have an LSAT score higher than 170.

Question 15

A frequency histogram of the age of giraffes in a zoo is skewed right. Which measure of center is more appropriate?

Accepted Answer

The median would provide a better measure of center.

Question 16

Here are costs (in dollars) of 12 electric smooth top ranges: 860, 1000, 650, 540, 1460, 1100, 700, 780, 870, 1300, 550, 1060. What is the range of the data set?

Accepted Answer

$$1460 - 540 = 920$$

Question 17

Given the data set: 71, 67, 67, 72, 76, 72, 73, 68, 72, 72. What is the five-number summary?

Accepted Answer

$$67, 68, 72, 73, 76$$

Question 18

A student scores 600 on the SAT (mean = 500, SD = 100) and 26 on the ACT (mean = 22, SD = 4). Assuming both are normally distributed, on which test did the student perform better relative to the mean?

Accepted Answer

SAT: $$z = \frac{600-500}{100} = 1$$; ACT: $$z = \frac{26-22}{4} = 1. $$The student performed equally well on both.

Question 19

Which of the three histograms shown summarizes the data set with the smallest standard deviation?

Accepted Answer

Histogram 2, because the data are most tightly clustered around the center.

Question 20

The age at which a person purchased a new BMW is summarized in a boxplot. For which series was the median age of purchase equal to 41?

Accepted Answer

The 3-series

Fundamental Concepts and Methods in Introductory Statistics

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