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Question: Research indicates that people who volunteer to participate in research studies tend to have higher intelligence than non-volunteers. To test this phenomenon, a researcher obtains a sample of 200 high school students. The students are given a description of a psychological research study and asked whether or not they would volunteer to participate. The researcher also obtains an IQ score for each student and classifies the students into high, medium, and low IQ groups. Do the following data indicate a significant relationship between IQ and volunteering?
IQ
High Medium Low Total
Volunteer 43 73 34 150
Not Volunteer 7 27 16 50
Total 50 100 50
Conduct a hypothesis test using the following steps. Set alpha = .05
5A. Step 1: State the null hypothesis in words.
5B. Step 2: Set up the criteria for making the decision. That is, find the critical value.
5C. Step 3: Summarize the data into the appropriate test-statistic.
5D. Step 4: Evaluate the null hypothesis (circle one)
REJECT FAIL TO REJECT
5E. Step 5: State your conclusion in words.
Duration of stuttering (in seconds) was compared for patients who had already been classified as having mild or moderate speech disabilities.
a. Calculate Kim's investment return. b. Calculate Kim's total dollar gain or loss on his investment.
1. Z is a standard normal variable. Find the value of Z in the following
Why is the cumulative distribution function right continuous? That is F(X
Public Health and Nutrition Many restaurants are now offering "healthy" items on their menus. Research suggests that these items may increase sales.
What is the margin of error for a 95% confidence interval for the difference of the two means (low capacity - high capacity)? (Answer to the nearest hundredth.)
It has been reported that 80% of taxpayers who are audited by the IRS end up paying more money in taxes. Assume that the auditors are randomly assigned cases and that one of the ways the IRS oversees its auditors is to monitor the percentage of ca..
perform a t-test, but they are not sure whether to use a paired or unpaired test. Base on the information provided, how would you advise your colleague
The average number of acres burned by forest and range fires in a large Wyoming county is 4,300 acres per year, with a standard deviation of 750 acres.
The probability that the Kwacha will weaken against the dollar is 0.54. The probability that you will purchase the dollar tomorrow is 0.40.
Using a 99% confidence interval, estimate the percentage throughout the state planning to return to school next year.
a manufacturer produces lightbulbs at a poisson rate of 239 per hour.the probability that a lightbulb is defective is
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