If the correlation between two sets of scores is 0 and one had
Question 1
0 out of 5 points
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If the correlation between two sets of scores is 0 and one had to predict the value of Y for any given value of X, the best prediction of Y would be _________.
Question 2
5 out of 5 points
If = 57.2, = 84.6, and bY = 0.37, the value of aY = _________.
Question 3
0 out of 5 points
For the following points what would you predict to be the value of Y’ when X = 19? Assume a linear relationship.
X
6
12
30
40
Y
10
14
20
27
Question 4
0 out of 5 points
During the past 5 years there has been an inflationary trend. Listed below is the average cost of a gallon of milk for each year.
1981
1982
1983
1984
1985
$1.10
$1.23
$1.30
$1.50
$1.65
Assuming a linear relationship exists, and that the relationship continues unchanged through 1986, what would you predict for the average cost of a gallon of milk in 1986?
Question 5
5 out of 5 points
In multiple regression, if the second predictor variable correlates highly with the predicted variable, than it is quite likely that _________.
Question 6
5 out of 5 points
The least-squares regression line minimizes _________.
Question 7
5 out of 5 points
There is ________ between the sY½X and r.
Question 8
5 out of 5 points
The points (0,5) and (5,10) fall on the regression line for a perfect positive linear relationship. What is the regression equation for this relationship?
Question 9
5 out of 5 points
If N = 8, S X = 160, S X2 = 4656, S Y = 79, S Y2 = 1309, and S XY = 2430, what is the value of bY?
Question 10
5 out of 5 points
A researcher collects data on the relationship between the amount of daily exercise an individual gets and the percent body fat of the individual. The following scores are recorded.
Individual
1
2
3
4
5
Exercise (min)
10
18
26
33
44
% Fat
30
25
18
17
14
Based on the above data, if an individual exercises 20 minutes daily, his predicted % body fat would be _________.
Question 11
0 out of 5 points
If the value of = 4.00 for relationship A and = 5.25 for relationship B, in which relationship would you have the most confidence in a particular prediction?
Question 12
5 out of 5 points
If the value for aY is negative, the relationship between X and Y is _________.
Question 13
5 out of 5 points
In the regression equation Y’ = X, the Y-intercept is _________.
Question 14
5 out of 5 points
If X and Y are transformed into z scores, and the slope of the regression line of the z scores is -0.80, what is the value of the correlation coefficient?
Question 15
5 out of 5 points
When predicting Y from two variables relative to using only one variable, _________.
Question 16
5 out of 5 points
When the relation between X and Y is imperfect, the prediction of Y given X is _________.
Question 17
0 out of 5 points
What would you predict for the value of Y for the point where the value of X is ?
Question 18
0 out of 5 points
If r = 0.4582, sY = 3.4383, and sX = 5.2165, the value of bY = _________.
Question 19
5 out of 5 points
If bY is negative, higher values of X are associated with _________.
Question 20
5 out of 5 points
The symbol for the standard error of estimate when predicting Y given X is _________.