SAT Prep on Statistics

In a survey, 60% of people prefer coffee and 40% prefer tea. If a person is selected at random, what is the probability that they prefer tea?

• 0.6

• 0.8

• 0.2

• 0.4

Complete the SAT problem (Calculator)

• A

• B

• C

• D

The table above shows the distribution of age and gender for 25 people who entered a contest. If the contest winner will be selected at random, what is the probability that the winner will be either a female under age 40 or a male age 40 or older?

• 4/25

• 10/25

• 11/25

• 16/25

Which measure of central tendency would best represent this data?

• Mean

• Median

• Mode

• Range

The dot plots above summarize the scores that two classes, each with 24 students, at Central High School achieved on a current events quiz. Which of the following correctly compares the standard deviation of the scores in each of the classes?

• The standard deviation of the scores in Class A is smaller.

• The standard deviation of the scores in Class B is smaller.

• The standard deviation of the scores in Class A and Class B is the same.

• The relationship cannot be determined from the information given.

Complete the SAT problem (Calculator)

• A

• B

• C

• D

Tags

CCSS.HSF-BF.A.1A

The data in the table above were produced by a sleep researcher studying the number of dreams people recall when asked to record their dreams for one week. Group X consisted of 100 people who observed early bedtimes, and Group Y consisted of 100 people who observed later bedtimes. If a person is chosen at random from those who recalled at least 1 dream, what is the probability that the person belonged to Group Y?

• 68/100

• 79/100

• 79/164

• 164/200

The ​ (a)   is the average.

• mean

• median

• mode

• range

A random sample of the students in two different universities were surveyed for their sleep habits. The results are shown in the table above. Which of the following statements is supported by the information in the table?

• The hours of sleep per night varies more among students at University A than students at University B.

• More students attend University B than University A.

• More than half of the students at University B get 7 hours of sleep per night.

• Half of the students at University A get 6 hours of sleep per night.