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1. The mean body mass index (BMI) for boys age 12 is 23.6. An investigator wants to test if the BMI is higher in 12-year-old boys living in New York City. How many boys are needed to ensure that a two-sided test of hypothesis has 80% power to detect a difference in BMI of 2 units? Assume that the standard deviation in BMI is 5.7.
=
Alpha = ________
Z1-α/2= ________
Z1-β= ________
ES = ________
n= ________
2. An investigator wants to estimate caffeine consumption in high school students. How many students would be required to estimate the proportion of students who consume coffee? Suppose we want the estimate to be within 5% of the true proportion with 95% confidence.
Z= ________
p= ________
Effect Size = ________
n=________
3. A crossover trial is planned to evaluate the impact of an educational intervention program to reduce alcohol consumption in patients determined to be at 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 2 drinks of the true mean difference? Assume that the standard deviation of the difference in the mean number of drinks is 6.7 drinks.
Alpha = _______
s= ________
Total Points forChapter Problems 4: /15
Attended a religious service at least once a month, 20 stopped to help a person with car trouble. At the 0.05 significance level, test the claim that the two proportions are equal.
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Assume there're three states of the economy: boom, moderate growth, and recession. The annual return on company A stock and company B stock in each state of the economy is given below
Determine the largest village in terms of the population?
To test whether there is a significant mean difference among the three.
Our sample size is 17. Which value most accurately represents the critical value of Z that you would use to plug in for your interval?
The level of significance indicates the probability of rejecting a false null hypothesis.
The average buglary rate for a juisdiction has been 311 per year with a standard deviation of 50 what is the probability that next year the number of burglaries will be more than 350.
The standard deviation is 0.73. Would it be unusual to randomly select 10 people and find that greater than 8 recognize the Famous Brand?
A description of what information the effect size would tell you that the probability value would not, and your hypothetical results in a few sentences using correct APA format.
If the estimated population variance of the change scores is 20, what would the variance of the distribution of the means of change scores be?
One of the children, though, fails to solve the problem so the researcher has an undetermined score. What is the best measure of central tendency for these data?
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