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Question: A researcher conducted and experiment on the effects of a new drug on depression. The researcher had a control group that received nothing, a placebo group, and an experimental group that received the drug. A depression inventory that provided a measure of depression on a 50-point scale was used (50 indicates that an individual is very high on the depression variable). The ANOVA summary table appears next, along with the mean depression score for each condition.
Source df SS MS F
Between groups 1,202.313
Within groups 2118.00
Total 3,320.313
Drug Condition Mean N
Control 36.26 15
Placebo 33.33 15
Drug /experimental 24.13 15
a. Complete the ANOVA Summary Table
b. Is Fobt significant at α'= .05; at α' = .01
c. Perform post hoc comparison if necessary
d. What conclusions can be drawn from the F-ration and the post hoc comparisons
e. What is the effect size, and what does this mean
f. Graph the means
Determine the sum of these probabilities , and why is the number less than 1
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In a study of 24 criminals convicted of antitrust offenses, the average age was 55 years, with a standard deviation of 7.6 years. Construct a 98% confidence interval of the true mean age.
Psychologists once measured 77 variables on a sample of schizophrenic people and a sample of people who were not schizophrenic. They compared the two samples using 77 separate significance tests.
The Minneapolis Tribune ran an article on gender differences in shopping behavior. When 400 women were asked to respond to the question "Where I shop is influenced by which store has a greater variety," 60% answered "Yes.
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A family has 5 children and 1 of them is a boy...the percentage of boy is 1/5, or .020. Do you think one could say the chances of any woman having a boy would be 1/5? Explain your answer.
An economist is interested in studying the incomes of consumers in a particular region. The population standard deviation is know to be $1,000. A random sample of 50 individuals resulted in an average income of $15,000.
A random sample is selected from a normal population. The population mean is 60 and the standard deviation is 15. after treatment the sample mean is 65. the sample size is 25.
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Also, what information do you need to get from the problem to put into Minitab to run a binomial calculation?
Find the percentage of such males that weigh between 190 and 210 lb. (Note: Make sure you choose the flag value closest to 190 and 210.) Give the proportion as a decimal rounded to thousandths.
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