Quiz 12
1. If there is a linear relationship between the quantity of food a person consumes per day and the person’s weight, the quantity of food a person consumes per day is the ______________.
a. independent variable
b. Unable to determine
c. dependent variable
2. A correlation coefficient for 9 pairs of data is calculated to be -0.213. Is the relationship between the variables statistically significant?
a. Unable to determine
b. No
c. Yes
3. Given the following pairs of data (independent variable given first): (17, 56), (13, 48), (35, 65), (89, 146), (55, 121), (86, 130), Calculate the Least Squares Line.
a. y-hat = -20.93 + 0.73x
b. y-hat = 33.33 + 1.24x
c. y-hat = 1.24 + 33.3x
d. y-hat = 0.73 - 20.93x
4. A correlation coefficient for 6 pairs of data is calculated to be 0. Then,
a. there is positive correlation between the variables.
b. the Line of Best Fit has a negative slope.
c. there is negative correlation between the variables.
d. the Line of Best Fit has a slope of zero.
5. A study is done to see if there is a linear relationship between the life expectancy of an individual and the year of birth. The year of birth is the ______________.
a. Unable to determine
b. dependent variable
c. independent variable
6. If you determine a point is an outlier, you would
a. ignore it.
b. always delete it and then recalculate the line of best fit.
c. examine it carefully and try to determine what is causing it to be an outlier.
d. use it in the calculation of the Sum of Squared Errors.
7. Given the following pairs of data (independent variable given first): (17, 56),(13, 48), (35, 65), (89, 146), (55, 121), (86, 130), find the estimated y for an x-value of 40.
a. -836
b. 1334
c. 83
d. 8.3
8. A study is done to see if there is a linear relationship between the calendar year and the population of a particular country. The calendar year is the
______________.
a. dependent variable
b. Unable to determine
c. independent variable
9. Given the following pairs of data (independent variable given first): (16, 56), (10, 98), (35, 105), (4, 70), (12, 121), the relationship between the two variables is ______________.
a. linear
b. not significant
c. parabolic
d. exponential
10. Given the following pairs of data (independent variable given first): (16, 56),(10, 108), (35, 20), (4, 170), (12, 100), the regression line is ______________.
a. steeply sloped downward
b. almost horizontal
c. steeply sloped upward
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