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Questions about non-parametric procedures
1. What are the most common reasons you would select a non-parametric test over the parametric alternative?
2. Discuss the issue of statistical power in non-parametric tests (as compared to their parametric counterparts). Which type tends to be more powerful? Why?
3. For each of the following parametric tests, identify the appropriate non-parametric counterpart:
a. Dependent t testb. Independent samples t testc. Repeated measures ANOVA (one-variable)d. One-way ANOVA (independent)e. Pearson Correlation
Can researcher conclude that humidity has significant effect on eating behavior? Use two-tail test with α = .05. Calculate estimated Cohen's d and r2 to measure size of treatment effect.
What percentage of the averages or medians of the sample will be greater than 140 seconds?
What is the probability that Susan passes on the first try? What is the probability that Susan first passes on the second try?
Is there reason to believe there is a positive linear correlation between the number of t.v. commercials and the sale of this product?
a bag contains 45 beans of three different varieties. each variety is represented 15 times in the bag. you grab 9 beans
Bill is doing a project for you in the marketing department. In conducting his analysis regarding consumer behavior and a new product that has come out
A) census bureau data show that the mean household income in the area served by a shopping mall is $62,500 per year. A market research firm questions shoppers at the mall to find out whether the mean household income of mall shoppers is higher..
a sample of 352 subscribers to wired magazine shows the mean time spent using the internet is 13.4 hours per week with
two samples of size 25 each yielding x-bar 6.47 sx 1.14 y-bar 6.17 and sy 1.166 show a significant difference
Suppose that among all participants, the mean test score is 70.07 and the standard deviation is 10.27. Use z-scores to interpret a raw score of 80. What is the corresponding z-score? How would you interpret this result? Show your work.
50 seconds and a standard deviation of 50 seconds. Find the probability that a randomly selected boy in secondary school can run the mile in less than 335 seconds.
What linear transformation will change sixth grade scores x into new scores xnew= a+bx that have the desired mean and standard deviation?
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