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Mgsc 291 Exam Study Guide Questions and Answers Graded A

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MGSC 291

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University Of South Carolina

The P-Value of a hypothesis test is the probability of seeing a test statistic this extreme or more - Correct Ans-In the direction of the alternative hypothesis if the null is true The interpretation of a hypothesis test result is about the - Correct Ans-Parameter Type 1 Error Rate - Correct ...

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Mgsc 291 Exam Study Guide Questions
and Answers Graded A 2024-2025
The P-Value of a hypothesis test is the probability of seeing a test statistic this extreme
or more - Correct Ans-In the direction of the alternative hypothesis if the null is true

The interpretation of a hypothesis test result is about the - Correct Ans-Parameter

Type 1 Error Rate - Correct Ans-Probability of rejecting the null when the null is true

Power - Correct Ans-Probability of rejecting the null when the null is false

Type 2 error rate - Correct Ans-Probability of failing to reject the null when the null is
false.

Using the same data set to construct a confidence interval, a 99% interval will be -
Correct Ans-Wider than a 95% interval

Increasing the sample size will make a confidence interval - Correct Ans-narrower

A good strategy for increasing power is to - Correct Ans-Increase the sample size

Suppose you conduct a statistical hypothesis test and it results in a P-Value of 0.10 with
an alpha of 0.05. You should - Correct Ans-Fail to reject the HO(do not find for HA)

Suppose we have conducted a hypothesis test and conclude to no reject HO. Which
one of the following statements is correct? - Correct Ans-A type 2 error may have been
made

Your 95% confidence interval for u1-U2 is (3,5). For the test of HO: U1-U2=0 against
U1-U2=/0 at an alpha of 0.05 you would - Correct Ans-Reject the null hypothesis (HO)

Your 95% confidence interval for U1-U2 is (3,5). What is the correct interpretation of the
confidence interval? - Correct Ans-We are 95% confident that mean 1 is bigget by 3 to
5.

The Darla Moore career center wants to study whether mean salary is different for male
and female graduates of the business school. Identify the correct null and alternative
hypothesis. - Correct Ans-HO: uM-uF=0, HA uM-Uf=/0

You want to study whether the percent of students who go on to have successful
careers is higher than 75%. Identify the correct null and alternative hypothesis. - Correct
Ans-HO:p=0.75, HA:p>0.75

, You study whether the percent of students who go on to have successful careers is
higher than 75%. Your P-value for the hypothesis test is 0.0005. You should conclude: -
Correct Ans-There is strong evidence the percent of students who are successful is
higher than 75%

You study whether the percent of student who go on to have successful careers is
higher than 75%. Your P-value for the hypothesis test is 0.15. You should conclude: -
Correct Ans-There is little to no evidence the percent of students who are successful is
higher than 75%

You conduct a test to see whether the percent of students who go on to have successful
careers is higher than 75%. Your test statistics is 2.9. Which area should you shade to
find the P-value for the test? - Correct Ans-B (because you shade the area to the right
b/c it is greater than)

In design of experiments, when you have k-factors, each with 2 levels you have a -
Correct Ans-2k factorial design

In regression and ANOVA, you can check which assumption(s) with a residuals versus
predicted plot? - Correct Ans-Errors have mean 0 & Errors have equal variance

In regression and ANOVA, you can check which assumption(s) with a QQ plot of the
residuals? - Correct Ans-Errors are normally distributed

The plot below shows and extreme point at (28,61). This point likely - Correct Ans-Has
high leverage

The correlations in these plots are -0.71, -0.06, 0.72,-0.90. Which plot has a correlation
of 0.72? - Correct Ans-Plot A (goes to the right, cause positive slope)

Which region had the highest average case price? - Correct Ans-Keuka
(Look at differences)

What are the degrees of freedom for location? - Correct Ans-2(3-1)

How is the F statistic calculated? - Correct Ans-(Mean sq/residual mean sq)

How to find mean sq? - Correct Ans-Sum sq/df

What is the null hypothesis for this anova - Correct Ans-Mean case price is the same for
all 3 regions

For a significant P-Value on a one-way ANOVA, what should you do next? - Correct
Ans-Run Tukey's HSD

The experiment was replicated __ times? - Correct Ans-three times

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