Statistics & Probability

A sample should be

• representative of  only middle school students only
• a very large group
• representative of the population
• representative of people who volunteer

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A radio station asks its listeners to dial one of two numbers to indicate their preference for one of two candidates in an upcoming election. Of the responses received, 76% favored candidate A. If there are 1,500 registered voters, how many will vote for candidate A?

• 1,140

• 6

• 1,974

• 100

Tags

CCSS.6.RP.A.3C

The Floppy Disk Company makes 3.5 inch floppy disks for disk drives that are 3.7 inches wide. The size of a manufactures disk is normally distributed with a standard deviation of 0.1 inches. The company manufactures 1000 disks every hour.

In one hour, how many disks would you expect to be between 3.4 inches and 3.7 inches?

• 819 disks
• 23 disks
• 500 disks
• 0 disks

Tags

CCSS.HSS.ID.A.4

The mean life of a tire is 30,000 km. The standard deviation is 2000 km.

Then, 68% of all tires will have a life between ___________ km and __________ km.

•  28,000 km and 32,000 km.
• 24,000 km and 34,000 km.
• 26,000 km and 34,000 km.
• 27,000 km and 31,000 km.

Tags

CCSS.HSS.ID.A.4

What is the interquartile range (IQR)?

• 4
• 64
• 60
• 8

Tags

CCSS.7.SP.B.4

It is a numerical description of a population characteristic.

• Parameter

• People

• Statistics

• Data

It is a numerical description of a sample characteristic

• Statistic

• Statistics

• Parameter

• Data

Which is not part of the 5 number summary?

• median

• Q3

• Maximum

• mean

Which of the following is the strongest correlation coefficient?

• -.80
• +.72
• -.14
• 0

A survey of 625 randomly selected students was conducted to determine student opinion about music. The survey reported that 36 percent of the students surveyed preferred country/western music. The survey estimate had a margin of error of 4 percentage points. A margin of error is reported because

• Sample proportions vary from sample to sample.
• Students may intentionally respond incorrectly.
• Students may misunderstand the survey questions.
• The people doing the survey may have recorded results incorrectly.

Tags

CCSS.HSS.IC.B.4