8th Grade Math CBA 5 (24-25) PDF

Name: ___________________________________ Date: ________________ 8th Grade Math CBA 5 (24-25) 1 Mrs. Williams wants to determine which year-end celebration to choose for the students. She wants student input, so she needs to choose a sample of 20 students from the sc...

Name: ___________________________________ Date: ________________ 8th Grade Math CBA 5 (24-25) 1 Mrs. Williams wants to determine which year-end celebration to choose for the students. She wants student input, so she needs to choose a sample of 20 students from the school. Which of the samples shown is a random sample? A Choose the first 20 students from an alphabetized school roster. B Choose the 20 students who volunteer for the school fundraising event this Friday. C Choose the first 20 students to arrive in the library in the morning. D Give every student a number and select 20 numbers from a box without looking. page 1 of 14 printed 10/25/24 2 Consider the scatterplots shown. For each scatterplot, determine if the relationship shown is linear, non-linear, or neither. If the relationship is linear, state whether the relationship is positive, negative, or neither. page 2 of 14 printed 10/25/24 3 A company employee had to read several financial reports. The scatterplot shows the lengths and reading times for those reports. Which prediction of the time in minutes to read a 90-page report is best supported by the data? A 95 min B 105 min C 125 min D 155 min page 3 of 14 printed 10/25/24 4 Mrs. Feinstein recorded the weight, in pounds, of each of her 8 great grandchildren. Her data is shown. 45, 52, 31, 27, 38, 60, 44, 55 What is the mean absolute deviation of the data? Record your response in the space provided. page 4 of 14 printed 10/25/24 5 Which scatterplot does NOT suggest a linear relationship between x and y? A C B D page 5 of 14 printed 10/25/24 6 The scatterplot shows the number of practice shots a basketball team took during each practice and the number of free throws the team missed in its next game. Complete the sentences to describe the trend in the data. Choose the correct answer from each drop-down menu to complete the sentences. increases decreases increases decreases negative linear positive nonlinear page 6 of 14 printed 10/25/24 7 A catering company recorded the total number of cookies that were eaten at events with different numbers of guests. The scatterplot shows the results. Based on the scatterplot, approximately how many cookies would be eaten at an event with 45 guests? A 41 B 39 C 48 D 44 page 7 of 14 printed 10/25/24 8 A local zoo has an Aquarium House exhibit with a variety of fish. They recorded the number of fish in each of their tanks. The data is shown. What is the mean absolute deviation of the data? F 2 G 2.88 H 15.1 J 28.8 page 8 of 14 printed 10/25/24 9 The scatterplot shows the relationship between the number of games a baseball team won in a season and the number of hours the team practiced each week during the season. Use the scatterplot to answer the following questions. (positive, negative, no) 10 20 13 15 page 9 of 14 printed 10/25/24 10 Which scatterplot best represents a nonlinear relationship between the x- and y- values? F H G J page 10 of 14 printed 10/25/24 11 The Silver Touch Engraving Company charges customers a one-time fee of $4.99 to set up an account. It costs $2.50 per letter for engraving. Suppose Samantha sets up an account and wants to engrave her name on a picture frame. How much will she have to pay? Enter your answer in the box provided in dollars and cents. page 11 of 14 printed 10/25/24 12 Given that the points (24, −20) and (−32, 1) lie on a line, what is the equation of the line? F y=− x+1 G y=− x+1 H y = − x − 11 J y = x − 11 page 12 of 14 printed 10/25/24 13 The table shows y as a function of x. x y −4 −6 −2 −3 6 4 5 7 Which ordered pairs can NOT belong to the function? Select TWO correct answers. page 13 of 14 printed 10/25/24 14 Which mapping does NOT represent y as a function of x? F G H J page 14 of 14 printed 10/25/24