SCM - FINAL EXAM COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+||BRAND
NEW!!
The multiple linear regression equation ŷ = 6 + 1.9x1 + 2x2 - 5x3 has (n-3) degrees
of freedom. - False
A marketing research firm is planning a study to test whether the market share
that a new product will capture during its first year on the market is at most 20
percent. After setting up the null and alternative hypotheses, the appropriate
alternative hypothesis would be that the market share percentage is: -
Greater than 20%
A correlation coefficient is an absolute measure. - False
In a simple linear regression analysis, the p-value associated with a test of the
slope coefficient was equal to .035, which would lead us to do what at the 5%
level of significance? - Conclude that the true slope for the population is
not equal to zero.
In forecasting the trend in sales from time series data with a simple linear
regression equation, the dependent variable would be time, since sales would
depend upon the time period used. - False
If a p-value in Excel is 8.4298E-142, that p-value is - a very small positive
number.
,A correlation coefficient of -1.0 would imply that the standard error of the
estimate (Se) would necessarily be equal to zero.
Correct Answer - True
In an upper-tailed test of the difference of two proportions, the z-value was
calculated to be 1.20. The p-value for this test would then be .1151. - True
A sporting goods company is testing two carriers to determine which company
should deliver its packages. The company wants to test if Carrier 2 has faster
shipping times. Packages were shipped to 36 locations using each of the carriers.
The results are as follows:
Carrier 1: mean delivery time = 14 hours, s = 3.1 hours, n = 36
Carrier 2: mean delivery time = 13 hours, s = 2.6 hours, n = 36
Difference (Carrier 1 time - Carrier 2 time): mean = 1 hour, s = 2.9 hours, n = 36
The correct t-value for this question is: - 2.07
When an analyst accepts the null hypothesis that the population slope is equal to
zero, the conclusion is that the X variable is a statistically significant predictor. -
False
Assume for a given hypothesis testing problem, the test statistic was computed
and led to an acceptance of the null hypothesis at the .10 level of significance.
Based on this information, we can further conclude that since H0 was accepted at
the 10% level, then H0 - must be accepted at the 1% level of significance
AND accepted at the 5% level of significance.
, For the same value x, the confidence interval for the average value of y is
_____________________ the prediction interval for the individual value of y. -
smaller than
A multiple linear regression model has multiple predictor variables. - True
A sporting goods company is testing two carriers to determine which company
should deliver its packages. The company wants to test if Carrier 2 has faster
shipping times. Packages were shipped to 36 locations using each of the carriers.
The results are as follows:
Carrier 1: mean delivery time = 14 hours, s = 3.1 hours, n = 36
Carrier 2: mean delivery time = 13 hours, s = 2.6 hours, n = 36
Difference (Carrier 1 time - Carrier 2 time): mean = 1 hour, s = 2.9 hours, n = 36
What is the alternative hypothesis for this problem? - Ha: µD > 0
A polling company would like to estimate the percentage of registered voters in a
state who plan to vote in the next election. The company decides to do a survey
to try to estimate the true proportion of registered voters in the state who plan to
vote. How large a sample should be taken in order to estimate the proportion to
within 10% with a 95.44% level of confidence? Assume the maximum error
possible. - 100
For n1= 200 and n2 = 100 from populations 1 and 2, the numbers of successes are
35 and 25 respectively. The value of the pooled estimator of π is - 0.20
For a given multiple regression model, the unadjusted R Square value will
generally be greater than the adjusted R Square value. - True
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+||BRAND
NEW!!
The multiple linear regression equation ŷ = 6 + 1.9x1 + 2x2 - 5x3 has (n-3) degrees
of freedom. - False
A marketing research firm is planning a study to test whether the market share
that a new product will capture during its first year on the market is at most 20
percent. After setting up the null and alternative hypotheses, the appropriate
alternative hypothesis would be that the market share percentage is: -
Greater than 20%
A correlation coefficient is an absolute measure. - False
In a simple linear regression analysis, the p-value associated with a test of the
slope coefficient was equal to .035, which would lead us to do what at the 5%
level of significance? - Conclude that the true slope for the population is
not equal to zero.
In forecasting the trend in sales from time series data with a simple linear
regression equation, the dependent variable would be time, since sales would
depend upon the time period used. - False
If a p-value in Excel is 8.4298E-142, that p-value is - a very small positive
number.
,A correlation coefficient of -1.0 would imply that the standard error of the
estimate (Se) would necessarily be equal to zero.
Correct Answer - True
In an upper-tailed test of the difference of two proportions, the z-value was
calculated to be 1.20. The p-value for this test would then be .1151. - True
A sporting goods company is testing two carriers to determine which company
should deliver its packages. The company wants to test if Carrier 2 has faster
shipping times. Packages were shipped to 36 locations using each of the carriers.
The results are as follows:
Carrier 1: mean delivery time = 14 hours, s = 3.1 hours, n = 36
Carrier 2: mean delivery time = 13 hours, s = 2.6 hours, n = 36
Difference (Carrier 1 time - Carrier 2 time): mean = 1 hour, s = 2.9 hours, n = 36
The correct t-value for this question is: - 2.07
When an analyst accepts the null hypothesis that the population slope is equal to
zero, the conclusion is that the X variable is a statistically significant predictor. -
False
Assume for a given hypothesis testing problem, the test statistic was computed
and led to an acceptance of the null hypothesis at the .10 level of significance.
Based on this information, we can further conclude that since H0 was accepted at
the 10% level, then H0 - must be accepted at the 1% level of significance
AND accepted at the 5% level of significance.
, For the same value x, the confidence interval for the average value of y is
_____________________ the prediction interval for the individual value of y. -
smaller than
A multiple linear regression model has multiple predictor variables. - True
A sporting goods company is testing two carriers to determine which company
should deliver its packages. The company wants to test if Carrier 2 has faster
shipping times. Packages were shipped to 36 locations using each of the carriers.
The results are as follows:
Carrier 1: mean delivery time = 14 hours, s = 3.1 hours, n = 36
Carrier 2: mean delivery time = 13 hours, s = 2.6 hours, n = 36
Difference (Carrier 1 time - Carrier 2 time): mean = 1 hour, s = 2.9 hours, n = 36
What is the alternative hypothesis for this problem? - Ha: µD > 0
A polling company would like to estimate the percentage of registered voters in a
state who plan to vote in the next election. The company decides to do a survey
to try to estimate the true proportion of registered voters in the state who plan to
vote. How large a sample should be taken in order to estimate the proportion to
within 10% with a 95.44% level of confidence? Assume the maximum error
possible. - 100
For n1= 200 and n2 = 100 from populations 1 and 2, the numbers of successes are
35 and 25 respectively. The value of the pooled estimator of π is - 0.20
For a given multiple regression model, the unadjusted R Square value will
generally be greater than the adjusted R Square value. - True
