Unit 2 Practice Test

A random number table is used to select 30 students from a large college statistics class to rate a statistics video on a scale from 1 to 5.

These 30 students are

• the sampling frame.

• the population.

• a simple random sample of the class.

• a census.

• a voluntary response sample.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A random number table is used to select 30 students from a large college statistics class to rate a statistics video on a scale from 1 to 5.

The ratings are used to estimate the how the entire class would rate the video.

The average of the ratings of all students in the class is

• a population parameter.

• a convenience sample.

• a census.

• the population.

• a statistic that is an unbiased estimate of the class rating.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

After the NBA labor dispute was resolved on January 6, the Gallup Poll questioned 671 people, "How much have you missed watching NBA basketball since the dispute started?" 60% said "Not at all."

Gallup reports this result margin of error is ±4 percentage points.

This means that

• we can be 95% confident that between 56% and 64% of all adults did not miss watching NBA games.

• we can be certain that between 56% and 64% of all adults did not miss watching NBA games.

• exactly 60% of adults did not miss watching NBA games.

• we are 95% confident that between 58% and 62% of all adults did not miss watching NBA games.

• 95% of all the possible samples will fall between 56% and 64%.

Tags

CCSS.HSS.IC.B.4

A major retailer wants to test-market bed & bath items designed by a famous fashion designer. It has over 1500 shops nationwide - located in downtown shopping centers, in suburban malls, and in smalltown stand-alone storefronts.

The retailer tests the product line each area: 10% downtown, 10% suburbs, and 5% smalltown stores.

What type of sampling method did the retail chain use?

• Simple random

• Systematic sample.

• Convenience sample.

• Cluster sample.

• Stratified sample.

Tags

CCSS.HSS.IC.B.3

Which of the following is not a source of bias in sample surveys?

• non-response

• wording of questions

• voluntary response

• use of a telephone survey

• all are sources of bias

Tags

CCSS.HSS.IC.B.3

The University of Georgia reports that 85% of the students have parking on campus.

The student newspaper published an online survey to ask students,

"Do you have student parking on campus?"

Of the 136 students who responded, 63% said "Yes."

Which % is the statistic, and which % is the parameter?

• 63% is the statistic, and

  85% is the parameter.

• 63% is the parameter,

  and

  85% is the statistic.

• Both

  63% and 85%

  are statistics.

• Both

  63% and 85%

  are parameters.

Tags

CCSS.HSS.IC.B.3

The University of Georgia reports that 85% of the students have parking on campus.

The student newspaper published an online survey to ask students,

"Do you have student parking on campus?"

Of the 136 students who responded, 63% said "Yes."

The newspaper poll does not give a trustworthy estimate of student opinion because there is

• bias due to nonresponse

• bias due to undercoverage

• bias due to the suggestive wording of the question.

• bias due to relying on voluntary response.

Tags

CCSS.HSS.IC.B.3

The University of Georgia reports that 85% of the students have parking on campus.

The student newspaper published an online survey to ask students,

"Do you have student parking on campus?"

When we say that the newspaper poll is biased, we mean that

• repeated polls would miss the truth about the population in the same direction

• repeated polls would give results that are very different from each other

• the question asked shows gender or racial bias

• faculty may have a different opinion from students.

Tags

CCSS.HSS.IC.B.3

You want to take an SRS of 50 of the 816 students who live in a college dormitory.

You label the students 001 to 816 in alphabetical order.

You read the entries from a random digit table:

96746 12149 37823 71868 18442 35119 62103 39244.

The first three students in your sample have which labels?

• 967, 461, 214

• 967, 121, 378

• 461, 214, 937

• 461, 214, 718

• 674, 214, 237

Random samples of size n were selected from a population. Based on our quick method, what happens to the margin of error if the sample size is increased from 100 to 400?

The ___________ the sample, the___________ the margin of error.

• larger; smaller

• smaller; larger

• larger; larger

• smaller; smaller

Tags

CCSS.HSS.IC.B.4