Review Topic 6:Use Sampling to Draw Inferences about Population

Mario compares random download times of movies from three different services using the table. Which service provided the fastest mean download speed?

Tags

CCSS.7.SP.A.1

CCSS.7.SP.B.4

Harry collects data from a random sample of seventh-graders. Out of 25 respondents, 10 ride the bus to school. Of the 150 seventh-graders who attend Harry’s school, how many would be expected to ride the bus to school?

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

To determine whether students want a new school mascot, Abby surveys every 25th student from an alphabetized list of students in the school. Will the survey results from this sample support a valid inference?

• Yes, because the sample is random and likely representative of the student body.

• No, because the sample is not random and may not be representative.

• Yes, because every student is surveyed.

• No, because only students with certain last names are included.

Tags

CCSS.7.SP.A.1

Carrie is comparing the growth of plants under natural and artificial light sources. Part A: Which measure of center would best help Carrie make an inference about the data from the box plots?

• Based on the mean, plants in Group P grew more than plants in Group Q.

• Based on the mean, plants in Group Q grew more than plants in Group P.

• Based on the median, plants in Group P grew more than plants in Group Q.

• Based on the median, plants in Group Q grew more than plants in Group P.

Tags

CCSS.7.SP.B.4

Carrie is comparing the growth of plants under natural and artificial light sources.

Part B
Which light source shows greater variability in plant growth according to the box plots?

• Natural light

• Artificial light

• Both have the same variability

• Cannot be determined from the box plots

Tags

CCSS.7.SP.B.4

The dot plot shows a random sample of the number of migrating geese flocks observed by 25 participants during a two-day hike.

Use the mean value of each data set to make an inference about the number of flocks observed each day?

• On average, most participants observed fewer flock on day 2.

• More participants observed 6 or more flocks on day 2.

• Both days had the same mean,

• The mean cannot be determined from the dot plot.

Tags

CCSS.7.SP.A.2

The drama teacher wants to determine whether more students at the school would attend a comedy or a musical performance. Select all the following that would NOT help the drama teacher draw conclusions about which performance more students would attend.

• Students who do not act

• Every 4th student selected from an alphabetical list of all students at the school

• Students who are in drama club

• Students who are in theater class

• The same number of students from each grade whose names are randomly selected from a hat

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Select all the measures of center that can be used to compare two data sets.

• Mean

• Interquartile range

• Median

• Mean Absolute Deviation (MAD)

• Range

Tags

CCSS.7.SP.B.4

Andy is comparing how long two tablets can be used after being fully charged.

Part A
Use the measures of center to make an inference about the day.

(a)   can be used longer than ​ (b)   after being fully charge.

• Tablet A
• Tablet B

Tags

CCSS.7.SP.B.4

Andy is comparing how long two tablets can be used after being fully charged. Based on the data, which tablet performs most consistently?

• Tablet A, because the measures of center are smaller for Tablet A than for Tablet B.

• Tablet B, because the measures of center are smaller for Tablet B than for Tablet A.

• Tablet A, because the measures of variability are smaller for Tablet A than for Tablet B.

• Tablet B, because the measures of variability are smaller for Tablet B than for Tablet A.

Tags

CCSS.7.SP.B.4