AnswersNJ-Algebra I CRUnit Test

Regression Models Answers

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Jessica plots the data points relating the amount of money she needs to repay a loan and the number of months she has been making payments. She calculates two regression models. Which is true?

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A
The linear model better represents the situation because the amount she owes is decreasing by about the same amount every 6 months.
B
The linear model better represents the situation because according to the exponential model, the repayment amount will never be 0.
C
The exponential model better represents the situation because the amount she owes decreases by about the same amount every 6 months.
D
The exponential model better represents the situation because according to the linear model, the repayment amount will eventually be negative.
2
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Marta’s mother shared a funny video of their cat on the Internet. The total number of people who had viewed the video over the first 30 days could be modeled using the function f(x) = 33(1.3)x where x is the number of days the video has been online.

A
190
B
858
C
6,271
D
86,460
3

The graph shows the data points in the table and the exponential regression model associated with the data. Based on the graph of the regression model, which is true?

Question illustration
A
The number of weeds is decreasing by a multiplicative rate.
B
The number of weeds is increasing by a multiplicative rate.
C
The number of weeds is decreasing by an additive rate.
D
The number of weeds is increasing by an additive rate.
4

The quadratic regression graphed on the coordinate grid represents the height of a road surface x meters from the center of the road.

Question illustration
A
The height of the surface decreases from the center out to the sides of the road.
B
The height of the surface increases, then decreases, from the center out to the sides of the road.
C
The height of the surface increases from the center out to the sides of the road.
D
The height of the surface remains the same the entire distance across the road.
5

The function f(t) = 349.2(0.98)t models the relationship between t, the time an oven spends cooling and the temperature of the oven.

Question illustration
A
0
B
100
C
300
D
400
6

The table compares x, the number of minutes of television Sam watched each day, to y, the number of minutes she spent exercising. The function y = –0.78x + 95 models the data in the table.

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A
45 minutes
B
72 minutes
C
83 minutes
D
118 minutes
7

The table shows the relationship between time spent running and distance traveled.

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A
linear, because the r value for the linear model is closest to 1
B
exponential, because the r value for the exponential model is closest to 0
C
linear, because the rate of change between each pair of points is exactly 520
D
exponential, because the rate of change between each pair of points is 1.98
8

The data in the table represents a company’s profit based on the number of items produced.

Question illustration
A
y = –1.026x2 + 1016.402x – 162075
B
y = –1.036x2 + 1024.771x – 163710
C
y = 298.214x – 66317.667
D
y = 196.2x – 18710
9

The table shows the population of a small town over time. The function P = 10,550(1.1)x models the population x years after the year 2000.

Question illustration
A
1950
B
2005
C
2025
D
2050
10

Juan analyzes the amount of radioactive material remaining in a medical waste container over time. He writes the function f(x)=10(0.98)x to represent the amount of radioactive material that will remain after x hours in the container.Rounded to the nearest tenth, how much radioactive material will remain after 10 hours?

A
0.8 units
B
1.3 units
C
8.2 units
D
9.8 units

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