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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
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. a) [0.722, 0.978] b) [0.802, 0.978] c) [0.702, 0.928] d) [0.802, 0.778] e) [0.852, 0.857] f) None of the above
What will increase the width of a confidence interval? a) Decrease confidence level. b) Increase variance. c) Decrease variance d) Increase number in sample
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