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**Unformatted text preview: **5/4/2015 Quiz 10 Fall Quiz 10 Fall Part 1 of 6 1.0/ 1.0 Points
1.0/ 1.0 Points Question 1 of 6 A major grocery store chain is trying to cut down on waste. Currently, they get peaches from two different
distributors, WholeFruits and GreenGrocer. Out of a two large shipments, the manager randomly selects items
from both suppliers and counts the number of items that are not sellable due to bruising, disease or other
problems. She then makes a confidence interval. Is there a significant difference in the quality of the peaches
between the two distributors?
95% CI for pWpG:(0.156, 0.064) A.We are 95% confident that the proportion of non sellable peaches from Whole Fruits is anywhere
between 6.4% and 15.6%. B.We are 95% confident that the proportion of non sellable peaches for Whole Fruits is about 6.4% and
15.6%. C.We are 95% confident that the proportion of non sellable items for Whole Fruits is anywhere between
6.4% and 15.6% HIGHER than the proportion of non sellable items for Green Grocer. D.We are 95% confident that the proportion of non sellable items for Whole Fruits is anywhere between
6.4% and 15.6% LOWER than the proportion of non sellable items for Green Grocer. E.We are 95% confident that the proportion of non sellable items for Whole Fruits is anywhere between
15.6% LOWER and 6.4% HIGHER than the proportion of non sellable items for Green Grocer. Part 2 of 6 1.0/ 1.0 Points
1.0/ 1.0 Points Question 2 of 6 Do students that are "Greek" (those who belong to a sorority/fraternity) have a tendency to be more involved in
student government events than students who are "not Greek"? Specifically, do more "Greek" students then "not
Greek" vote in the student elections? Let "Greek" students be group A and "NotGreek" students be group B. Out
of 250, 200 randomly selected "Greek" students voted in the last election. Out of 500, 140 randomly selected "not
Greek" students voted in the last election.
How would we write the alternative hypothesis? A.Ha: pA pB = 0 B.Ha: pA pB > 0 C.Ha: pA pB < 0 D.Ha: pA pB does not equal 0 Part 3 of 6 1.0/ 1.0 Points 1.0/ 1.0 Points
Question 3 of 6
When we make inferences about the difference of two independent population proportions, what assumptions do
we need to make? Mark all that apply.
1d9240b4a1377b83eeeed0ee/jsf/select/selectIndex 1/3 5/4/2015 Quiz 10 Fall A. Random samples. Feedback: We always need to do this. B. Normal distribution of the
response variable. C. Sample size must be greater
than or equal to 30. D. Counts of successes and
failures at least 15 each for each
group. Feedback: This is necessary for the distribution of phat to be fairly
symmetric (not too extreme in either direction) only in the case of one
proportion. E. The sum of the counts of
successes and failures must be
greater than 30. Part 4 of 6 1.0/ 1.0 Points 1.0/ 1.0 Points
Question 4 of 6
A social scientist is interested in determining if there is a significant difference in the proportion of Republicans
between two areas of town. He takes independent random samples of 20 families in each area of town and a
significance test was conducted. The pvalue was 0.016. What should be our conclusions? A.The evidence is pretty strong there is a difference in the
proportion of Republicans between the two areas of town. Feedback: correct small pvalue indicates
significant differences, and a pvalue of .016
is pretty small. B.The evidence is pretty strong there is no significant
difference in the proportion of Republicans between the two
areas of town. C.We do not have enough evidence to say that there is a
significant difference in the proportion of Republicans between
the two areas of town. Part 5 of 6 1.0/ 1.0 Points Question 5 of 6
What is the definition of Type 2 error? 1.0/ 1.0 Points A.Rejecting the null hypothesis when the null hypothesis is really false. B.Failing to reject the null hypothesis when the null hypothesis is really false. C.Rejecting the null hypothesis when the null hypothesis is really true. D.Failing to reject the null hypothesis when the null hypothesis is really true. Feedback: Check the definition in your textbook or lab workbook.
Part 6 of 6 1.0/ 1.0 Points 1.0/ 1.0 Points
Question 6 of 6
In 2012, the General Social Survey included a question that asked respondents if they had "often/sometimes"
1d9240b4a1377b83eeeed0ee/jsf/select/selectIndex 2/3 5/4/2015 Quiz 10 Fall been treated rudely at work. Out of 614 men, 62 said yes they had "often/sometimes" been treated rudely at work.
Out of 589 women, 79 said yes they had "often/sometimes" been treated rudely at work. What is the pooled
proportion for the null hypothesis Ho:p1p2=0 vs. alternative hypothesis Ha: p1p2 does not equal 0? A.0.0739 B.0.101 C.0.134 D.0.117 E.Unknown 1d9240b4a1377b83eeeed0ee/jsf/select/selectIndex 3/3 ...

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- Spring '08
- Ripol
- Statistics, Null hypothesis, Infantry battalions of the United States Marine Corps, Green Grocer, non sellable items