Quiz 10 - PRINTABLE VERSION Quiz 10 You scored 100 out of...

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Quiz 10

Question 1   Your answer is CORRECT . The z-score associated with the 97.5 percent confidence interval is
a ) 2.160
b ) 1.900
c ) 2.241
d ) 2.744
e ) 1.960
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 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 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 49 8th graders at a large suburban middle school indicated that 89 % of them are involved with some type of after school activity . Find the 95 % 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 22 Yellow 22 Orange 12 Green 15 Blue 15 Find the 95 % confidence interval for the proportion of yellow M&Ms in that bag .
a ) [ 0.128 , 0.280 ]
Question 6   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 24 Red 21 Yellow 21 Orange 15 Green 15 Blue 15 Find the 99 % confidence interval for the proportion of green M&Ms in that bag .
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PRINTABLE VERSION Quiz 10 You scored 100 out of 100 Question 1 Your answer is CORRECT. The z-score associated with the 97.5 percent confidence interval is a) 2.160 b) 1.900 c) 2.241 d) 2.744 e) 1.960 f) None of the above
Question 2 Your answer is CORRECT. What will increase the width of a confidence interval?
Question 3 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 margin of error associated with a 98% confidence interval that estimates the proportion of them that are involved in an after school activity.
c) 0.094 d) 0.083 e) 0.041 f) None of the above Question 4 Your answer is CORRECT. A simple random sample of 49 8th graders at a large suburban middle school indicated that 89% of them are involved with some type of after school activity. Find the 95% confidence interval that estimates the proportion of them that are involved in an after school activity.
Question 5 Your 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 22 Yellow Orange 12 Green 15 Blue Find the 95% confidence interval for the proportion of yellow M&Ms in that bag. 20% 10% 22 15

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