Statistics Review

Roberto wants to know the favorite sport of adults in his hometown.  He surveys 50 adults at a baseball game.  Is this random or biased sampling?

• Random
• Biased

Tags

CCSS.7.SP.A.1

Paula wants to know the favorite type of music for students at her school.  She surveys the first 60 people who enter the school doors in the morning. Is this random or biased sampling?

• Random
• Biased

Tags

CCSS.7.SP.A.1

Fred wants to determine the mean hourly wage of the working students at his school. He asks thirty of his friends their hourly wage and calculates the sample mean to be $6.  Is this random or biased sampling?

• Random
• Biased

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Ms. Madson wants to know how many students will attend the next 7^th grade after school dance.  She places all the 7^th grade students’ names in a jar and selects 50. Is this random or biased sampling?

• Random
• Biased

Tags

CCSS.7.SP.A.1

A factory produces 3,000 Xbox 360’s per hour.  An inspector randomly selects all Xboxes from the assembly line produced from 8:00am to 9:00am and finds 20 are not working properly.  How many Xboxes would the inspector expect to be defective after eight hours?

• 200
• 160
• 240
• 300

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Ms. Jennings put a total of 50 blue and red marbles in a bag.  She had her students pull 10 marbles out, record how many were red, and place them back in the bag. Using the table, predict how many red marbles are in the bag.   

• 38
• 33
• 25
• 40

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

CCSS.7.SP.B.4

Ms. Clarke wanted to find out what flavor ice cream (chocolate, vanilla, or strawberry) is the most popular in her school.  Which sample size would be the most reliable?

• 10
• 50
• 75
• 150

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Carol wants to know how many people live in each household in her town.  She conducts two random surveys of 10 people each and asks how many people live in their home.  In Sample A she finds out the following data: 1, 6, 2, 4, 4, 3, 5, 5, 2, 8
What is the mean absolute deviation (MAD)?

• 4
• 3.5
• 1.6
• 16

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

CCSS.7.SP.B.4

Find the mean absolute deviation (MAD) of the following numbers:
3, 4, 5, 4, 3, 2, 4, 5, 4, 4

• 0.5
• 3.8
• 0.68
• 1.2

Tags

CCSS.6.SP.A.3

CCSS.6.SP.B.5

Which answer choice best describes the variability of the two data sets?

• The variability of the data recorded for JJ Wright is 3 times greater than the variability of the data recorded for Holly Creek.   
• The variability of the data recorded for both JJ Wright and Holly Creek is about the same. 
• The variability of the data recorded for JJ Wright is of the variability of the data recorded for Holly Creek.
• There is not enough information to determine the variability for either school.

Tags

CCSS.7.SP.B.3

CCSS.7.SP.B.4