Standard deviation of difference in mean number of drinks

Reference no: EM13102605

A crossover trial is planned to evaluate the impact of an educational intervention program to reduce alcohol consumption in patients determined to be risk for alcohol problems. The plan is to measure alcohol consumption ( the number of drinks on a typical drinking day) before the intervention and then again after participants complete the educational intervention program. How many participants would be required to ensure that a 95% confidence interval for the mean difference in the number of drinks is within two drinks of the true mean? Assumed that the standard deviation of the difference in the mean number of drinks is 6.7 drinks.

Reference no: EM13102605

Questions Cloud

Estimate the difference in the mean bmi between boys-girls : An investigator wants to design a study to estimate the difference in the mean BMI between boys and girls age 12 living in new york city. How many boys and girls are needed to ensure 95% confidence interval estimate for the difference in mean BMI ..

Description of probability based on z score : What is the expected value of M and the standard error of M for a sample of n=4 scores? What is the expected value of M and the standard error of M for a sample of n = 25 scores?

Explain influence of issues in multicultural psychology : Create the 700-word paper in which you analyze at least two emerging issues in multicultural psychology. Explain the influence that these issues will have on society.

Difference in proportions with a margin of error : How many men and women are needed to generate a 95% confidence interval estimate for the difference in proportions with a margin of error not exceeding 4%?

Standard deviation of difference in mean number of drinks : Assumed that the standard deviation of the difference in the mean number of drinks is 6.7 drinks.

Explaining binomial probability distribution : An article in USA Today stated that "Internal surveys paid for by directory assistance providers show that even the most accurate companies give out wrong numbers 15% of the time."

Evaluate the solubility of the two salts : Give explanation why it is not practical to evaluate the solubility of the two salts AX and BY2, by simply comparing the solubility product constants?

Simulation of queueing systems : Consider the following continuously operation job shop. Inter arrival times of jobs are described as follows: What is the average time for the 10 new jobs?

How development of atlantic world influence kingdoms : How did development of "Atlantic World" influence kingdoms and colonies which were part of it? Choose three examples and discuss.

User Account

All Pages