Econ 2843 Exam 3 Questions With
Complete Solutions
When would it be appropriate for a two-way ANOVA test? - CORRECT
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ANSWER✔✔-When you reject the null on a one way anova. Meaning | | | | | | | | | | |
one of the groups is different. (One way says yes or no if one of the
| | | | | | | | | | | | | | | |
groups is different) | |
Can you calculate the SSE? - CORRECT ANSWER✔✔-Find difference
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between each point and its column mean. Square it then add them all
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up.
What were the differences between Tukey's HSD method compared to
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Fisher's LSD method? - CORRECT ANSWER✔✔-Fishers uses a T-score
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and does not account for the inflated Type I error but Turkeys does.
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With ANOVA testing what is a Type 1 Error and what is a Type 2 Error? -
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CORRECT ANSWER✔✔-Type 1(A null hypothesis is rejected when it is
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actually true) |
Type 2(A null hypothesis is accepted when it should have been rejected)
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, What is not a restriction when comparing 2 population means? -
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CORRECT ANSWER✔✔-· MORE DATA (N gets bigger AKA Sample size)
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When do you use the Z distribution when comparing 2 population
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means? - CORRECT ANSWER✔✔-When sigma is known aka Standard
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Deviation
When do you pool the sample variances and? - CORRECT ANSWER✔✔-
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When standard deviation is unknown but they are considered to be the
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same. When you have 2 groups SD is unknown but considered to be the
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same.
It is generally believed that no more than 0.50 of all babies in a town in
| | | | | | | | | | | | | | | |
Oklahoma are born 2 weeks early. A politician claims that the
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proportion of babies born 2 weeks early is increasing. Identify the
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correct null and alternative hypotheses to test the politician's claim -
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CORRECT ANSWER✔✔-· Null P<=.5 (Null always has the <= or >=)
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Alternative P>.5 (Greater than right tail, less than left tail)
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What does the standard error of the estimate measure? - CORRECT
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ANSWER✔✔-Measures the average difference between the actual | | | | | | |
values.
Complete Solutions
When would it be appropriate for a two-way ANOVA test? - CORRECT
| | | | | | | | | | | |
ANSWER✔✔-When you reject the null on a one way anova. Meaning | | | | | | | | | | |
one of the groups is different. (One way says yes or no if one of the
| | | | | | | | | | | | | | | |
groups is different) | |
Can you calculate the SSE? - CORRECT ANSWER✔✔-Find difference
| | | | | | | | |
between each point and its column mean. Square it then add them all
| | | | | | | | | | | | |
up.
What were the differences between Tukey's HSD method compared to
| | | | | | | | | |
Fisher's LSD method? - CORRECT ANSWER✔✔-Fishers uses a T-score
| | | | | | | | |
and does not account for the inflated Type I error but Turkeys does.
| | | | | | | | | | | |
With ANOVA testing what is a Type 1 Error and what is a Type 2 Error? -
| | | | | | | | | | | | | | | | |
CORRECT ANSWER✔✔-Type 1(A null hypothesis is rejected when it is
| | | | | | | | | |
actually true) |
Type 2(A null hypothesis is accepted when it should have been rejected)
| | | | | | | | | | |
, What is not a restriction when comparing 2 population means? -
| | | | | | | | | | |
CORRECT ANSWER✔✔-· MORE DATA (N gets bigger AKA Sample size)
| | | | | | | | |
When do you use the Z distribution when comparing 2 population
| | | | | | | | | | |
means? - CORRECT ANSWER✔✔-When sigma is known aka Standard
| | | | | | | | |
Deviation
When do you pool the sample variances and? - CORRECT ANSWER✔✔-
| | | | | | | | | |
When standard deviation is unknown but they are considered to be the
| | | | | | | | | | | |
same. When you have 2 groups SD is unknown but considered to be the
| | | | | | | | | | | | | |
same.
It is generally believed that no more than 0.50 of all babies in a town in
| | | | | | | | | | | | | | | |
Oklahoma are born 2 weeks early. A politician claims that the
| | | | | | | | | | |
proportion of babies born 2 weeks early is increasing. Identify the
| | | | | | | | | | |
correct null and alternative hypotheses to test the politician's claim -
| | | | | | | | | | |
CORRECT ANSWER✔✔-· Null P<=.5 (Null always has the <= or >=)
| | | | | | | | | |
Alternative P>.5 (Greater than right tail, less than left tail)
| | | | | | | | |
What does the standard error of the estimate measure? - CORRECT
| | | | | | | | | | |
ANSWER✔✔-Measures the average difference between the actual | | | | | | |
values.
