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DSIMGTS Finals Reviewer (Canvas) /Questions And Answers
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DSIMGTS Finals Reviewer (Canvas) /Questions AndAnswers
Answer :c. Correlation coefficient - Quiz :A measure of the strength of the
relationship between two variables is the
a. Coefficient of determination
b. Standard error of the estimate
c. Correlation coefficient
d. Slop b of the estimated regression line
Answer :b. The F test and the t test may or may not yield the same results -
Quiz :In simple linear regression analysis, which of the following is not true?
a. The relationship between x and y is represented by means of a straight line
b. The F test and the t test may or may not yield the same results
c. The value of F = t2
d. The F test and the t test yield the same results
Answer :a. Decrease by 3,000 units - Quiz :A regression analysis between
demand (y in 1000 units) and price (x in dollars) resulted in the following
equation. y = 9 - 3x. The equation implies that if the price is increased by $1,
the demand is expected to
a. Decrease by 3,000 units
b. Increase by 6 units
c. Decrease by 3 units
d. Decrease by 6,000 units
Answer :b. There is only one dependent variable - Quiz :In regression analysis,
the F test will provide the same conclusion as the t test if
a. The y-intercept is positive
b. There is only one dependent variable
c. There is only one independent variable
d. There is a positive correlation between x and y
Answer :b. None of these answers are correct - Quiz :If there is a very strong
correlation between two variables, then the coefficient of correlation must be
a. Either much larger than 1 or much smaller than 1
b. None of these answers are correct
c. Much smaller than 1, if the correlation is negative
d. Much larger than 1, if the correlation is positive
, Answer :b. There may or may not be any causal relationship between x and y -
Quiz :If two variables, x and y, have a strong linear relationship, then
a. x causes y to happen
b. There may or may not be any causal relationship between x and y
c. y causes x to happen
d. None of these answers are correct
Answer :b. None of these answers are correct - Quiz :If the coefficient of
determination is 0.81, the coefficient of correlation
a. Must be 0.9
b. None of these answers are correct
c. Must be positive
d. Is 0.6561
Answer :b. Coefficient of determination - Quiz :The proportion of the variation
in the dependent variable y that is explained by the estimated regression
equation is measured by the
a. Confidence interval estimate
b. Coefficient of determination
c. Standard error of the estimate
d. Correlation coefficient
Answer :c. Residual - Quiz :The difference between the observed value of the
dependent variable and the value predicted by using the estimated regression
equation is the
a. Variance
b. Standard error
c. Residual
d. Prediction interval
Answer :d. 0.6 - Quiz :If a data set has SST=2000 and SSE=800, then the
coefficient of determination is
a. 0.4
b. 0.5
c. 0.8
d. 0.6
Answer :c. Outlier - Quiz :A data point (observation) that does not fit the
trend shown by the remaining data is called a(n)
a. None of the other answers is correct
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