What is the test statistic?

What is the p value?

I previously calculated the test statistic as 1.282 using a t-table. But I was told this is incorrect.

Help please!!

- Thread starter aweimer
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What is the test statistic?

What is the p value?

I previously calculated the test statistic as 1.282 using a t-table. But I was told this is incorrect.

Help please!!

A recent survey on drug use and health measured the prevalence of drug use in the United States. This survey is designed to provide estimates on the use of illicit drugs, alcohol, and tobacco among members of United States households aged 12 and older. In addition, numerous demographic variables like gender,age, race, etc. are recorded. Assume that this is a legitimate statistical survey and that valid inferences for the US population may be drawn from its results.

In the 2007 survey, 90 out of 760 respondents aged 12 to 15 years old indicated that they had tried marijuana. Investigators would like to estimate the true proportion for the population of 12 to 15 year olds in the US that have tried marijuana. To do this, they wish to construct a 90% confidence interval.

Does this help?

I may be closer now... Can I use the point estimate for smokers/non-smokers so calculate the standard deviation?

I got square root of ((p(1-p))/n) = 0.0117.

If I can get the proper test statistic I can figure the rest of it out, but I feel like I'm going in circles right now.