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Quiz 10.pdf

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Question 1   Your answer is CORRECT . The z-score associated with the 96.5 percent confidence interval is
a ) 2.108
b ) 1.812
c ) 1.767
d ) 2.012
e ) 2.611
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 INCORRECT . A simple random sample of 100 8th graders at a large suburban middle school indicated that 82 % 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 23 Red 21 Yellow 22 Orange 14 Green 17 Blue 14 Find the 97 % confidence interval for the proportion of yellow M&Ms in that bag .
a ) [ 0.116 , 0.280 ]
b ) [ 0.016 , 0.230 ]
c ) [ 0.166 , 0.171 ]
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 23 Red 21 Yellow 20 Orange 16 Green 15 Blue 14 Find the 95 % confidence interval for the proportion of blue M&Ms in that bag .
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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 yellow M&Ms in that bag if we want a margin of error of ± .11 ?
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10/26/2019Print Test1/7PRINTABLE VERSIONQuiz 10You scored 49 out of 100Question 1Your answer is CORRECT.The z-score associated with the 96.5 percent confidence interval is a) 2.108b) 1.812c) 1.767d) 2.012e) 2.611f) 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 64 8th graders at a large suburban middle school indicated that 88% of them areinvolved with some type of after school activity. Find the margin of error associated with a 98% confidenceinterval that estimates the proportion of them that are involved in an after school activity.
10/26/2019Print Test2/7
Question 4Your answer is INCORRECT.A simple random sample of 100 8th graders at a large suburban middle school indicated that 82% of themare involved with some type of after school activity. Find the 95% confidence interval that estimates theproportion of them that are involved in an after school activity.