Question 1

Which of the following best describes the statement: “530 out of 750 students at the local elementary school prefer vanilla over chocolate ice cream”?

Accepted Answer

It describes a population because it includes all students at the school.

Question 2

What is the level of measurement for the variable: “The heart rates (in beats per min) of an athlete during an exercise session”?

Accepted Answer

Ratio

Question 3

A researcher wants to study the effects of a new medication by giving it to one group and a placebo to another. What type of study is this?

Accepted Answer

Experiment

Question 4

Which measure of center is most appropriate for describing the color of students’ shirts in a kindergarten class?

Accepted Answer

Mode

Question 5

Given the following data set: 15, 17, 23, 21, 18, 19, 13, 11. What is the mean?

$$	ext{Mean} = \frac{15 + 17 + 23 + 21 + 18 + 19 + 13 + 11}{8}$$

Accepted Answer

$$17.1$$

Question 6

A box contains 61 red marbles, 42 white marbles, and 58 blue marbles. What is the probability of randomly selecting a white marble?

$$P(	ext{white}) = \frac{42}{61 + 42 + 58}$$

Accepted Answer

$$0.247$$

Question 7

A survey asked 1500 U.S. teens who play video games how often they play. If 12% play about once a week, how many teens is this?

$$	ext{Number} = 0.12 	imes 1500$$

Accepted Answer

$$180$$

Question 8

Are the events 'randomly select a blood donor with type O blood' and 'randomly select a female blood donor' mutually exclusive?

Accepted Answer

No, because a donor can be both female and have type O blood.

Question 9

Refer to the Pareto chart provided. What is the probability of randomly selecting someone who feels that the biggest issue is workflow issues?

$$P(	ext{workflow issues}) = \frac{14}{47}$$

Accepted Answer

$$0.298$$

Question 10

Refer to the Pareto chart provided. What is the probability of randomly selecting someone who feels that the biggest issue is non-clinical workload or staffing issues?

$$P(	ext{non-clinical or staffing}) = \frac{5 + 15}{47}$$

Accepted Answer

$$0.426$$

Question 11

A brand of automobile tires has a mean life span of 34,000 miles and a standard deviation of 2,050 miles. What is the z-score for a tire that lasted 36,000 miles?

$$z = \frac{36,000 - 34,000}{2,050}$$

Accepted Answer

$$0.98$$

Question 12

Which of the following is an example of an interval level of measurement?

Accepted Answer

Temperature in degrees Celsius

Question 13

If you want to sort 30 temperature data points into 7 classes, what is the class width?

$$	ext{Class width} = \frac{	ext{max} - 	ext{min}}{7} ($$rounded up to the next whole number)

Accepted Answer

5 (rounded up from 4.14)

Question 14

Which measure of center is most appropriate for describing the salaries of workers at Amazon, given that salaries are often skewed by a few very high earners?

Accepted Answer

Median

Question 15

A cumulative frequency for the fourth class in a frequency table is calculated by:

Accepted Answer

Adding the frequencies of the first four classes

Question 16

Which of the following best describes a census?

Accepted Answer

A study that collects data from every member of the population

Question 17

If the standard deviation of a data set is 0, what does this indicate about the data?

Accepted Answer

All values in the data set are the same

Introductory Statistics Practice Exam 1 – Guided Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard