Exam 2 - PSYC 109

How many students participated in the survey?

• 38 students

• 30 students

• 68 students

• 136 students

The table, shown below, displays the data collected from a random group of high school students regarding whether they "liked" snowboards and/or "liked" skateboards. How many students said they like snowboards? What type of Probability is this?

• Marginal probability

• Joint probability

• Conditional probability

• Cumulative probability

How many students like snowboards, but do not like skateboards? What type of frequency is this?

• Union of events

• Simple probability

• Conditional probability

• Joint probability

Ursula interviewed 75 people to see if they liked reading comic books. Of the people surveyed, 15 were males. In all, 32 females liked comic books, and 9 males liked comic books. How many females did not like comic books?

• 43

• 32

• 28

• 19

What is the conditional frequency that a person does not like comic books given that the person is a male?

• 0.2

• 0.4

• 0.6

• 0.8

What is the approximate joint frequency that a person was 21–35 and did not recycle?

• 10%

• 20%

• 30%

• 40%

What is the approximate frequency that a person surveyed was 51–65 years old given that he or she recycles?

• 10%

• 20%

• 30%

• 40%

Based on this survey, is it more likely that a 21–35 year old recycles or a 51–65 year old recycles? Use conditional frequencies to justify your answer.

• A 21–35 year old is more likely to recycle.

• A 51–65 year old is more likely to recycle.

• Both age groups are equally likely to recycle.

• There is not enough information to determine.

Complete the following frequency table. Is it more likely that people who have a job have a savings account?

• Yes, it is more likely that people who have a job have a savings account.

• No, it is not more likely that people who have a job have a savings account.

• The likelihood is the same for people with or without a job.

• There is not enough information to determine the likelihood.

In hypothesis testing, what is a Type I error?

• Failing to reject a true null hypothesis

• Rejecting a true null hypothesis

• Failing to reject a false null hypothesis

• Rejecting a false null hypothesis