A survey is planned to determine what proportion of high-school students in a metropolitan school system...
A survey is planned to determine what proportion of high-school students in a metropolitan school system have regularly smoked marijuana. The school administrators would like to estimate the proportion with 98 % confidence and a margin of error of no more than 3.25%.
- It was reported that 26.19% of high school students in a similar metropolitan area regularly smoke marijuana. If this estimate is used, what sample size would be required? n =
- If the administrators choose not to use the estimate from the similar metropolitan area, what sample size would be required? n =
- If the level of confidence were decreased to 96 %, what would
happen to the required sample size?
- The sample size would not be affected.
- A smaller sample size would be required.
- A larger sample size would be required.
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A survey is planned to determine what proportion of high-school
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It was reported that 31.62% of high school students in a metropolitan area regularly smoke marijuana. If school administrators would like to estimate the proportion of students at their school who regularly smoke marijuana, how large a sample should be selected so that the margin of error is + 4% with a level of confidence of 98%? n=
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Large Sample Proportion Problem. A survey was conducted on high school marijuana use. Of the 2266 high school students surveyed, 970 admitted to smoking marijuana at least once. A study done 10 years earlier estimated that 45% of the students had tried marijuana. We want to conduct a hypothesis test to see if the true proportion of high school students who tried marijuana is now less than 45%. Use alpha = .01. What is the critical value for this test?...
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