Bid Ideas Math Ch. 8 Test Review

You want to estimate the number of students in your school who support extra funding for the history club. You survey every fourth student who enters the school. Is the sample biased?

• Yes, because not all students have an equal chance of being selected.

• No, because every student is surveyed.

• Yes, because only students who like history are surveyed.

• No, because the sample size is large and random.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

You want to determine the number of students in your school who have visited a theater. You survey 35 students at random. Twenty-one have visited a theater, and fourteen have not. So, you conclude that 60% of the students in your school have visited a theater. Is your conclusion valid?

• Yes, because the sample size is large enough.

• No, because the sample may not represent the entire school.

• Yes, because 21/35 is 60%. More than half have visited a theater.

• No, because the survey was not conducted in a theater.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

You and a group of friends want to know how many students in your school prefer rock music. There are 400 students in your school. Each person in the group randomly surveys 20 students. Use your sample to make an estimate for the number of students in your school who prefer rock music.

• 100 students

• 200 students

• 300 students

• 400 students

Tags

CCSS.7.SP.A.2

You want to know the mean number of sick days taken by students in your county last year. At each of five schools, you randomly survey ten students. Your results are shown. Use all five samples to make one estimate for the mean number of sick days taken by students in your county last year.

• 4.36 days

• 10.2 days

• 15 days

• 2.5 days

Tags

CCSS.7.SP.A.2

You want to know the average weight of a potato from Idaho. Should you survey the population or a sample?

• Population

• Sample

• Neither

• Both

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Sixty percent of students in your school own a bike. In a sample, the ratio of students who own a bike to those who do not is 6:10. Does this sample closely estimate the percentage of students in your school who own a bike?

• Yes, it closely estimates

• No, it overestimates

• No, it underestimates

• It cannot be determined

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Two data sets contain an equal number of values. The double box-and-whisker plot represents the values in the data sets. Compare the data sets using measures of center and variation.

• Set A and Set B have the same medians.

• Set A has a greater measure of center and Set B has a greater measure of variation.

• Set B has a greater measure of cente and Set A has a greater variation.

• Set A and Set B have different medians but the same measure of variation.

Tags

CCSS.7.SP.B.4

The dot plots show two data sets. Express the difference in the measures of center as a multiple of the measure of variation.

• There is no difference in data set A and data set B.

• The difference in the means of data set A and data set B is 30 times the MAD.

• The difference in the means of data set A and data set B is 10 times the MAD.

• The difference in the means of data set A and data set B is 3 times the MAD.

Tags

CCSS.7.SP.B.3