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A researcher conducted a study on the effects of stress on migraines. The researcher computed the number of migraines individuals reported during a six-month time frame as a function of the amount of stress they reported during that same time period. There were three stress levels: low, mild, and severe. The sums of squares appear in the following ANOVA table. The means for each condition and the number of participants per condition are also provided.
Source
df
SS
MS
F
Between groups
22.167
Within groups
14.750
---------
Total
36.917
----------
Stress Level
Mean
N
Low
3
4
Mild
Severe
6
a) Complete the ANOVA summary table.
b) Is Fobt significant at a = .05?
c) Perform post hoc comparisons, if necessary.
d) What conclusions can be drawn from the F-ratio and the post hoc comparisons?
e) What is the effect size, and what does it mean?
Construct a 96% confidence interval for the mean weight of all firefighters six months after the exercise rooms were installed.
What can be done to remedy multicollinearity? Use ANOVA instead of Regression.
If the company does not want to replace more than 5% of the televisions?
The point estimate for the difference between the proportions is:
Ophelia O'Brien, VP of Consumer Credit of American First Banks (AFB), monitors the default rate on personal loans at the AFB member banks.
Perform exploratory data analysis on all variables in the data set. Realizing that you have six groups, be sure that your exploratory analysis is broken down by group. When possible, include appropriate graphs to help illustrate the dataset.
Set up a null and alternative hypothesis to test whether this sample is falling below expectations.
Support casinos in the sample? B) calculate a 95% confidence interval to estimate the population proportion of all residents who wupport casinos.
What control chart(s) would you use for this data and what are the final control limits?
A health care analyst would like to know that if the duration of a given eye surgical procedure has a normal distribution with a mean of 240 minutes and a standard deviation of 40 minutes
What are the similarities and dissimilarities between a chi-square analysis and a correlation analysis? Suppose you conducted a study to see if there was an association between political party affiliation and whether or not someone voted.
Does age make a difference in the amount of savings a worker feels is needed to be secure at retirement? Suppose 210 workers in the 25-33 age category and 176 workers in the 34-52 age category were involved in this study.
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