Prediction Quiz
The question sheet
Reveal any answer as you study-
For the driver deaths data, which variable is the independent variable?
- Ages
- Correlation coefficient
- Slope
- Number of driver deaths
Reveal answer
Answer: Ages
Source evidence
PDF page 729: b. Using “ages” as the independent variable and “Number of driver deaths per 100,000” as the dependent variable,
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For the 75+ age group, what x value should be used?
- 85
- 80
- 75
- 78
Reveal answer
Answer: 80
Source evidence
PDF page 729: a. For each age group, pick the midpoint of the interval for the x value. (For the 75+ group, use 80.)
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For each age group in the driver deaths data, what x value is chosen?
- Mean of all ages
- Midpoint of the interval
- Highest value
- Lowest value
Reveal answer
Answer: Midpoint of the interval
Source evidence
PDF page 729: a. For each age group, pick the midpoint of the interval for the x value. (For the 75+ group, use 80.)
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In the driver deaths problem, part e asks you to predict deaths for which ages?
- 30 and 50
- 50 and 70
- 40 and 60
- 20 and 40
Reveal answer
Answer: 40 and 60
Source evidence
PDF page 729: e. Predict the number of deaths for ages 40 and 60.
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What form is the least squares line put into?
- ŷ = bx − a
- ŷ = a + bx
- y = a − bx
- y = mx + b
Reveal answer
Answer: ŷ = a + bx
Source evidence
PDF page 729: c. Calculate the least squares (best–fit) line. Put the equation in the form of: ŷ = a + bx
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In the driver deaths data, how many driver deaths per 100,000 occur for ages 16–19?
- 24
- 38
- 28
- 36
Reveal answer
Answer: 38
Source evidence
PDF page 729: Age Number of Driver Deaths per 100,000 16–19 38 20–24 36 25–34 24 35–54 20 55–74 18 75+ 28
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In the driver deaths data, the deaths per 100,000 for ages 25–34 is:
- 24
- 20
- 36
- 18
Reveal answer
Answer: 24
Source evidence
PDF page 729: Age Number of Driver Deaths per 100,000 16–19 38 20–24 36 25–34 24 35–54 20 55–74 18 75+ 28
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In the life expectancy data, what was the life expectancy for birth year 1950?
- 78.7
- 62.9
- 59.7
- 70.2
Reveal answer
Answer: 70.2
Source evidence
PDF page 730: Year of Birth Life Expectancy 1930 59.7 1940 62.9 1950 70.2 1965 69.7 1973 71.4 1982 74.5 1987 75 1992 75.7 2010 78.7
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For the life expectancy data, part e finds estimates for births in which years?
- 1940 and 1992
- 1965 and 1987
- 1950 and 1982
- 1930 and 2010
Reveal answer
Answer: 1950 and 1982
Source evidence
PDF page 730: e. Find the estimated life expectancy for an individual born in 1950 and for one born in 1982.
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In the life expectancy problem, part j estimates life expectancy for a birth year of:
- 1900
- 1930
- 2010
- 1850
Reveal answer
Answer: 1850
Source evidence
PDF page 730: j. Using the least squares line, find the estimated life expectancy for an individual born in 1850. Does the least
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In the restaurant data, part e finds estimated maximum values for restaurants on which pages?
- ten and 200
- 4 and 90
- 25 and 85
- ten and 70
Reveal answer
Answer: ten and 70
Source evidence
PDF page 731: e. Find the estimated maximum values for the restaurants on page ten and on page 70.
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In the restaurant table, what is the maximum value for page number 4?
- 16
- 19
- 15
- 17
Reveal answer
Answer: 16
Source evidence
PDF page 731: Page number Maximum value ($) 4 16 14 19 25 15 32 17 43 19 57 15 72 16 85 15 90 17
Introductory Statistics
Introductory Statistics by OpenStax, used under CC BY 4.0. Changes made by Stratacademy.
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