MIS 345 EXAM 2 | QUIZ 4 | QUE AND ANSWERS

MIS 345 EXAM 2
QUIZ 4:
1. Data collected from approximately the same period of time from a cross-sec- tion of a population are called:
time series data linear data

cross-sectional data

historical data: cross-sectional data
2. Outliers are observations that:
lie outside the sample render the

study useless

lie outside the typical pattern of points on a scatterplot

disrupt the entire linear trend: lie outside the typical pattern of points on a scatterplot
3. In regression analysis, if there are several explanatory variables, it is called:
simple regression multiple

regression compound regression

composite regression: multiple regression
4. In choosing the "best-fitting" line through a set of points in linear regres- sion, we choose the one with the:
smallest sum of squared residuals largest sum of squared

residuals smallest number of outliers




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largest number of points on the line: smallest sum of squared residuals
5. The standard error of the estimate () is essentially the mean of the residuals
standard deviation of the residuals mean of the

explanatory variable

standard deviation of the explanatory variable: standard deviation of the residu- als
6. In multiple regression, the constant (Alpha) :
is the expected value of the dependent variable Y when all of the independent variables have the
value zero

is necessary to fit the multiple regression line to set of points must be adjusted for the number of

independent variables

are all of these options: is the expected value of the dependent variable Y when all of the
independent variables have the value zero
7. T/F
The two primary objectives of regression analysis are to study relationships between variables and to use those
relationships to make predictions.: TRUE
8. T/F
If a categorical variable is to be included in a multiple regression, a dummy variable for each category of the
variable should be used, but the original categorical variables should not be sued.: TRUE
9. The regression line has been fitted to the data points (28, 60), (20, 50), (10, 18), and (25, 55). The sum of the
squared residuals will be:

20.25

16.00




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49.00

94.25: 94.25
10.In linear regression, a dummy variable is used:
to represent residual variables

to represent missing data in each sample

to include hypothetical data in the regression equation

to include categorical variables in the regression equation

when "dumb" responses are included in the data: to include categorical vari- ables in the regression equation
11.Correlation is a summary measure that indicates:
a curved relationship among the variables

the rate of change in Y for a one unit change in X

the strength of the linear relationship between pairs of variables

the magnitude of difference between two variables: the strength of the linear relationship between pairs of variables
12.The weakness of scatterplots is that they:
do not help identify linear relationships

can be misleading about the types of relationships they indicate only help identify outliers

do not actually quantify the relationships between variables: do not actually quantify the relationships between
variables
13.In regression analysis, which of the following causal relationships are possible?




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