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

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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 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?
Question 3 Your answer is CORRECT. A simple random sample of 100 8th graders at a large suburban middle school indicated that 81% 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.
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.
e) [0.686, 0.924] f) None of the above

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