Topic 6 Test

Which has the fastest mean speed?

• City Net

• Able Cable

• Tel-N-Net

Tags

7.DSP.B.11

Lucy collects data from a random sample of seventh-graders. Out of 40 respondents, 7 attend after-school programs. Of the 200 seventh-graders attending Lucy’s school, how many would be expected to attend after-school programs?

(a)  

Tricia surveys students in her computer class about the time spent on computers by students in her school. Will the survey results from this sample support a valid inference? Explain.

• No; Only a few students in the school take computer class.

• No; Students in computer class likely use computer more than other students.

• Yes; Students in computer class are representative of the school.

• Yes; Students in computer class are representative of people in the town.

Make an inference about the measures of center

• Based on the medians, plants in Group A grew more than plants in Group B.

• Based on the medians, plants in Group B grew more than plants in Group A.

• Based on the means, plants in Group B grew more than plants in Group A.

• Based on the means, plants in Group A grew more than plants in Group B.

Make an inference about the data using measures of variability

• The range and IQR are lesser in Group B as compared to Group A, so there is greater variability in the growth of Group B.

• The range and IQR are greater in Group B as compared to Group A, so there is lesser variability in the growth of Group B.

• The range and IQR are greater in Group B as compared to Group A, so there is greater variability in the growth of Group B.

• The range and IQR are lesser in Group B as compared to Group A, so there is lesser variability in the growth of Group B.

Use the mean to make an inference about the number of fish caught each day..

• More participants caught 6 fish than any other number.

• The same participants who caught and released 1 fish the first day caught and released 1 fish the second day.

• On average, participants caught and released more fish on Day 2.

• On average, most participants caught and released 5 or more fish.

A school principal wants to know what theme students prefer for the spring dance. There are 150 students in 6th grade, 200 students in 7th grade, and 187 students in 8th grade. Select all the representative samples that can help the principal draw conclusions about which themes the students prefer.

• The students in the 7th grade homerooms

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

• The members of the student council

• Students who attended the winter dance

• 50 sixth graders, 67 seventh graders, and 62 8th graders

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

• Mean

• Interquartile Range

• Median

• Mean Absolute Deviation (MAD)

• Range

Based on the data, which car performs most consistently? Explain.

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

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

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

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

Find the mean absolute deviation to solve.

• The MAD for the run time of comedy movies is 96.

• The MAD for the run time of comedy movies is 3.2.

• The MAD for the run time of action movies is 130

• The MAD for the run time of action movies is 18.4.

• The MAD for the run time of action movies is 3.2.