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Difference between teenage female and male depression

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1.) The difference between teenage female and male depression rates estimated from two samples is 0.08. The estimated standard error of the sampling distribution is 0.04. What is the 95% confidence interval? Use the critical value z = 1.96.

2.) Quit Smoking: Previous studies suggest that use of nicotine-replacement therapies and antidepressants can help people stop smoking. The New England Journal of Medicine published the results of a double-blind, placebo-controlled experiment to study the effect of nicotine patches and the antidepressant bupropion on quitting smoking. The target for quitting smoking was the 8th day of the experiment.

In this experiment researchers randomly assigned smokers to treatments. Of the 171 smokers taking a placebo, 26 stopped smoking by the 8th day. Of the 253 smokers taking only the antidepressant buproprion, 84 stopped smoking by the 8th day. Calculate the estimated standard error for the sampling distribution of differences in sample proportions.

3.) Quit Smoking: Previous studies suggest that use of nicotine-replacement therapies and antidepressants can help people stop smoking. The New England Journal of Medicine published the results of a double-blind, placebo-controlled experiment to study the effect of nicotine patches and the antidepressant bupropion on quitting smoking. The target for quitting smoking was the 8th day of the experiment.

In this experiment researchers randomly assigned smokers to treatments. Of the 162 smokers taking a placebo, 28 stopped smoking by the 8th day. Of the 272 smokers taking only the antidepressant buproprion, 82 stopped smoking by the 8th day.

Calculate the 99% confidence interval to estimate the treatment effect of buproprion (placebo-treatment). (The standard error is about 0.0407. Use critical value z = 2.576.)

4.) Gardeners on the west coast of the United States are investigating the difference in survival rates of two flowering plants in drought climates. Plant A has a survival rate of 0.72 and plant B has a survival rate of 0.41. The standard error of the difference in proportions is 0.082. What is the margin of error for a 99% confidence interval? Use critical value z = 2.576.

Reference no: EM132351242

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