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1. You are comparing whether a junior high anti-drug program has an effect on the rates of drug use in junior high students such that students completing the anti-drug program will have lower rates of drug usage. You random sample 100 seventh grade students before they enter the program and after they complete the program. Which test do we use to see if the difference in our sample is statistically significant? Why? Should it be one or two-tailed?
2. A researcher is studyin the difference between gender and support of the death penalty. The researcher feels that men are more likely to support the death penalty than women. Both the IV and DV are defined as nominal dichotomies and compared in a cross-tab. Which measure of association would the researcher use to compare the relationship between the IV and DV? Why?
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Can we conclude that mean time for game is less than 3.50 hours? Use.05 significance level.
Assume that the smiling time of eight-week old babies, in seconds, follows a uniform distribution between 0 and 23 seconds, inclusive. This means that any smiling time from 0 to and including 23 seconds is equally likely.
Develop an appropriate forecast model for the given problem whereas the student population has remained constant during this period.
Change the frequencies to percentages - is there a group more likely to get high salaries.
The market model relating the rate of return of stock XYZ (denoted RXYZ) to the rate of return Of a broader index of the stock market (denoted RM) is reported as:
In addition, record the values for the UCL, center line, and LCL. Also, record any points that are out of control. Use a z-value of three.
The dimension is supposed to be 224 mm and the variability of the manufacturing process is unknown. Is there evidence that the mean dimension is not 224 mm?
A group of students collected data at the Cedar Point amusement park and reported that the "wait time" to ride the "Top Thrill Dragster" roller coaster is consistently distributed within a range of 40 minutes to 90 minutes.
Find the t c for a 90% confidence level with a sample size of 18.
Compute the within group variability. Do you require any post hoc testing? Why or why not? Decribe in detail.
You have two unbiased estimates, e 1 and e 2 , of a quantity with variances V 1 and V 2 respectively, and covariance Cov {e1,e 2 } = C. Form a new unbiased estimate:
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