UNIT TEST REVIEW

A restaurant sells pizza for the prices in the data table.  Calculate the linear regression equation of the data.

• y = 1.5x + 12

• y = 12x + 1.5

• y = 0.67x - 8

• y = -8x + 0.67

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books.  Use the trend line to predict how many chapters would be in a book with 180 pages.

• 12 chapters

• 15 chapters

• 18 chapters

• 21 chapters

If Joe worked 30 hours, how much is he expected to earn?

• $200

• $600

• $800

• $1000

The linear regression equation is y = 61.93x - 1.79.  Use the equation to predict how far this person will travel after 10 hours of driving.

• 10 miles

• 0.19 miles

• 500 miles

• 617.5 miles

A high school principal wants to improve student attendance. Which of the following questions is least likely to be a statistical question that could guide their initial data collection?

• What is the average daily attendance rate for each grade level this semester?

• Which specific students were absent on Tuesday of last week?

• Is there a trend in the overall attendance rate over the past five academic years?

• Is there a correlation between participation in extracurricular activities and attendance rates?

Consider a marine biologist studying the health of a coral reef. Which of these questions is the most clearly NOT a statistical question in this context?

• What is the average size of the brain coral colonies in this section of the reef?

• What is the pH level of the water at precisely location X on the reef today at 10:00 AM?

• What is the variety of fish species observed within a 10-meter radius at different times of the year?

• Is there a difference in the prevalence of coral bleaching in shallow versus deep areas of the reef?

A political group asked voters waiting in line to vote: Who are the 2 major candidates running for president this year?

• Statistical

• Non-Statistical

When you ask a question to make a prediction about a larger group, you are asking a statistical question; what makes a question a statistical one?

• has a variety of answers

• has a clearly defined population

• focus on trends and patterns

• there is exactly one right answer

Which type of data is often used to understand participant’s opinions and thoughts?

• Qualitative

• Quantitative

Which of the following variables are quantitative? 
A. type of car 
B. weekly wage 
C. plane fares 
D. petrol prices
E. breed of dog   

• A, B, and C

• A, B, C, and E

• B, C, and D

• A, B, C, and D