Basic Statistics 6th and 7th grade

The dot plots show exam scores for

25 students. Which exam has an outlier?

• Semester 1

• Semester 2

• Both

• Neither

What are the medians for the Semester

1 exam and the Semester 2 exam?

• 75 and 79.8

• 85 and 80

• 75 and 80

• 95 and 100

A sample is being chosen for a survey to find out how people feel about adding more stop signs near a school. Which group would be least biased?

• randomly chosen voters

• randomly chosen drivers

• randomly chosen students

• randomly chosen teachers

• Daytime people

• Evening people

• They have the same number.

• You cannot tell from the box plots.

A random sample of 60 was taken from a shipment of 12,500 light bulbs. There were 2 defective bulbs in the sample. How many defective bulbs would you expect in the entire shipment? Round to nearest whole number if needed. (12,500 divided by 60.....answer multiplied by 2)

• 250

• 417

• 2500

• 4,167

Tia wants to find out students’ favorite after-school activity. She asks a sample of students, “Do you like doing sports after school?” Rewrite the question so it is not biased.

• What is your favorite class?

• Do you like sports?

• What is your favorite after-school activity?

• Do you stay after school for activities?

Which value is not part of the five key values that represent a box plot?

• the lower quartile

• the least value

• the median

• the range

What are the two medians?

• 10 and 10

• 30 and 35

• 40 and 50

• 20 and 70

The circled numbers represent the agent’s random sample. Use the mean of the random sample to estimate the total number of people in the entire 15-block neighborhood. Find the mean and then multiply it by the 15-block to see how many people live on the block.

• The mean of the random sample is 5, so the total number of people in the neighborhood is estimated to be 15 x 5, which is 75.

• The mean of the random sample is 15, so the total number of people in the neighborhood is estimated to be 15 x 15, which is 225.

• The mean of the random sample is 10, so the total number of people in the neighborhood is estimated to be 15 x 10, which is 150.

• The mean of the random sample is 8, so the total number of people in the neighborhood is estimated to be 15 x 8, which is 120.

Find the range and median.

• range: 1; median: 3

• range: 3; median: 12

• range: 12; median: 3

• range: 2; median: 2