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1. In a study of the effects of stress on illness, a researcher tallied the number of colds people contracted during a six month period as a function of the amount of stress they reported during that same time period. There were three stress levels: minimal, moderate and high stress. The sums of squares appear in the following ANOVA summary table. The mean for each condition and the condition and the number of subjects precondition are also noted.
Source df SS MS F
Between groups 22.167
Within groups 14.750
Total 36.917
Stress Level Mean N
Minimal 3 4
Moderate 4 4
High 6 4
a. Complete the ANOVA Summary Table
b. Is Fobt significant at ?= .05; at ? = .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
Certain tubes manufactured by a company have a mean life of 800 hours and standard deviation of 60 hours. Find the probability that a random sample of 16 tubes taken from the group will have a mean life of?
A 99% confidence interval estimate of the population mean can be interpreted to mean that we have 99% confidence that the true population mean will fall within the confidence interval estimate.
Net sales of the Kaiser Aluminum and Chemical Corporation for the period beginning in 1975 and ending in 1984 were:
Explain your findings (including the logic of comparing within-group to between-group population variance estimates, how each of these is figured, and the F distribution).
Compare the two forecasts computed in (a) and (b), using MAD. Which one should the dealer use for January of the next year?
To exercise your skills, you are to perform the following using different tools available to you (e.g. Excel spreadsheet, graphing calculator, etc.) and write and explanation on your findings:
A Gallup Poll (June 9 to 12, 2008) interviewed a random sample of 822 adults (18 years or older). The people in the sample were asked about their level of confidence in a variety of institutions in the United States. Here are the results for small..
When the necessary conditions are met, a two-tail test is being conducted to test the difference between two populations proportions.
Develop an estimated regression equation using handling, dependability, and fit & finish to predict overall quality. Is the estimated regression equation significant? Why?
if a white-collar worker is chosen at random from this group, what is the probability that he or she prefers light beer (to reg. beer or none at all)?
Your high school graduating class had 564 members. Thirty-three percent of these are expected to attend college. The probability that less than 160 will attend college is
An overnight express company must include seven cities on its route. How many different routes are possible, assuming that it matters in which order the cities are included in the routing?
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