Quiz 9.pdf - CourseWare You scored 100 out of 100 Question...

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Quiz 9.pdf

Question 1   Your answer is CORRECT . The z - score associated with the 98 percent confidence interval is
a ) 2.326
b ) 1.985
c ) 2.829
d ) 2.254
e ) 2.054
f) None of the above
Question 2   Your answer is CORRECT . What will increase the width of a confidence interval ?
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Question 3   Your answer is CORRECT . A simple random sample of 100 8th graders at a large suburban middle school indicated that 86 % of them are involved with some type of after school activity . Find the margin of error associated with a 98 % confidence interval that estimates the proportion of them that are involved in an after school activity .
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Question 4   Your answer is CORRECT . A simple random sample of 64 8th graders at a large suburban middle school indicated that 88 % of them are involved with some type of after school activity . Find the 98 % confidence interval that estimates the proportion of them that are involved in an after school activity .
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Question 5   Your answer is CORRECT . Mars Inc. claims that they produce M&Ms with the following distributions : Brown 30 % Red 20 % Yellow 20 % Orange 10 % Green 10 % Blue 10 % A bag of M&Ms was randomly selected from the grocery store shelf , and the color counts were : Brown 22 Red 21 Yellow 22 Orange 13 Green 17 Blue 14 Find the 97 % confidence interval for the proportion of yellow M&Ms in that bag .
a ) [ 0.018 , 0.235 ]
b) [ 0.038 , 0.285 ]
c) [ 0.118 , 0.285 ]
d) [ 0.168 , 0.173 ]
e) [ 0.118 , 0.085 ]
f) None of the above
Question 7   Your answer is CORRECT . Mars Inc. claims that they produce M&Ms with the following distributions : Brown 30 % Red 20 % Yellow 20 % Orange 10 % Green 10 % Blue 10 % How many M&Ms must be sampled to construct the 98 % confidence interval for the proportion of red M&Ms in that bag if we want a margin of error of ± .14 ?
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Question 8   Your answer is CORRECT . An experimenter flips a coin 100 times and gets 56 heads . Find the 96.5 % confidence interval for the probability of flipping a head with this coin .
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11/2/2017CourseWare1/6You scored 100 out of 100Question 1Your answer is CORRECT.The z-score associated with the 98 percent confidence interval is a) 2.326b) 1.985c) 2.829d) 2.254e) 2.054f) None of the above
Question 2Your answer is CORRECT.What will increase the width of a confidence interval?
Question 3Your answer is CORRECT.A simple random sample of 100 8th graders at a large suburban middle school indicated that 86% of them are involvedwith some type of after school activity. Find the margin of error associated with a 98% confidence interval thatestimates the proportion of them that are involved in an after school activity.
11/2/2017CourseWare2/6Question 4Your answer is CORRECT.A simple random sample of 64 8th graders at a large suburban middle school indicated that 88% of them are involvedwith some type of after school activity. Find the 98% confidence interval that estimates the proportion of them that areinvolved in an after school activity.
Question 5Your answer is CORRECT.Mars Inc. claims that they produce M&Ms with the following distributions:Brown 30% Red 20% Yellow Orange 10% Green 10% Blue A bag of M&Ms was randomly selected from the grocery store shelf, and the color counts were:Brown 22 Red 21 Yellow Orange 13 Green 17 Blue 20% 10% 22

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