Unit Test — Unit test Answers

Jasmine compared the two graphs below.Graph ADaily High Temperatures and Bottled Water SalesGraph BDaily High Temperatures and Bottled Water SalesShe decide to use graph A to predict the number of bottles of water that would be sold when the temperature is 100 degrees Fahrenheit. Which is likely Jasmine’s reasoning?

The table shows the number of free throws a player makes in a basketball game and the number of points the player scores in the game.Number of Free Throws vs. Number of Points ScoredNumber of Free Throws Made(f)Number of Points Scored(s)515311820718921Alex used a regression calculator to find the equation of the trend line for the data in the table. He rounded the values for a and b on his calculator as shown below.Which trend line compares the data in the table?

The two-way table below describes the practice habits of members of the school band and choir.Practice Habits of School Musicians Less than30 Minutes per DayAt Least30 Minutes per DayBand Students3826Choir Students1812Which statement best describes the relationship between the two variables?

A scientist measured the amounts of fertilizer given to plants, the heights to which the plants grew, and the amount of fruit the plants produced. The data is shown below, and the trend lines are shown below the table.If a tree is given the fertilizer and grows to 80 inches, how much fruit is the tree expected to produce?

The graph below shows the hours students spent studying and their language arts test scores.Hours Spent Studying vs. Language Arts Test ScoresBased on trend line on the graph, what is the expected test score for a student who did not study?

Grace conducted a study to show how many hours her dog sleeps after having one or two hours of exercise. She set up a two-way table in four different ways. Which table will best represent Grace’s data?

Kiara made the table below to show the IQ scores and grade point averages (GPAs) of students in her class. She made another table to show the standardized test scores and IQ scores.IQ, GPA, and SAT ScoresIQGPA IQStandardized Test Score1203.7 1201540852.3 858001103.0 1101,200962.7 9610001002.9 1001100She graphs the data in each table and writes the rounded values as shown for the regression line .Next, Kiara uses the steps below to predict a student’s standardized test score based on the student’s GPA of 4.0.Step 1Write the equation of the trend line for IQ and GPA.Step 2Write the equation of the trend line for IQ and standardized test score.Step 3Find the IQ that is expected from a GPA of 4.0.The IQ is about 122.5.Step 4Find the corresponding standardized test score for an IQ of 122.5.The standardized test score is 523.In which step did Kiara make the first error?

The graph below shows the daily high temperature and bottled water sales for a street vendor.Daily High Temperatures and Bottled Water SalesWhat relationship exists between the daily high temperature and bottled water sales?

The graph below shows the heights and arm spans of students in a class.Height and Arm Span of StudentsWhat association is there between height and arm span?

Lisa created the table below to show how different students get to school.How Students Get to School BusBikeTotal7th Grade79 1288th Grade83 112Total162 According to the table, how many students in the seventh grade bike to school?

The two-way table below displays information about passengers on a commercial flight.Passenger Data First ClassCoachChecked Bags1081Did Not Check Bags1457What percentage of coach passengers did not check bags? Round to the nearest tenth.

The graph below shows the heights and arm spans of students in a classroom.Height and Arm Span of StudentsBased on the graph, which is the best prediction of the height of a student with an arm span of 143 cm?

The two-way table below describes the car rental habits of sales representatives attending a conference.Sales Representatives’ Car Rentals, by Length of Stay StayingFewer than Two NightsStayingat Least Two NightsRented a Car911Did Not Rent a Car2114What percentage of representatives staying at least two nights rented a car?

Nicole is studying a two-way table. She has computed the relative frequencies by column for each cell. What characteristic of the data will imply an association between the two variables?

The band leader is recording the number of students in the seventh and eighth grades who play flute and clarinet. Which describes the variables in the two-way table?Band Assignments FluteClarinetTotal7th Grade1924438th Grade221840Total

In May, there were 14 days where the temperature was above 60°F and 17 days when it was below 60°F. There were also 19 days that were sunny. If a two-way table is made to represent the data, which could be the row and column headings?

The graphs below show the test scores for students in different subject areas and the time the students spent studying for the tests.Math Scores vs. Hours Spent StudyingScience Scores vs. Hours Spent StudyingSpelling Scores vs. Hours Spent StudyingHistory Scores vs. Hours Spent StudyingWhich graph shows the strongest association between the hours spent studying and the test scores?

Siloni computed in a two-way table the relative frequencies of boys’ and girls’ participation in school sports at her school.School Sports Participation by Gender FallSpringBoys37%57%Girls63%43%Which statement best describes the relationship between the two variables?

The table shows the scores that Ms. Cohen’s students earned on the Chapter 6 and Chapter 7 tests. Student ScoresWhat is represented by the expression ?

One graph below shows the language arts test scores for students versus the time they spent studying. The other graph shows the language arts test scores versus the spelling test scores for the students.Graph 1: Language Arts Scores vs. Hours Spent StudyingGraph 2: Language Arts Scores vs. Spelling Test ScoresHow do the graphs compare?