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Q1) A student was asked to calculate mean and standard deviation for given sample of n = 5 81, 87, 89, 86, & 87. To simplify arithmetic, student first subtracted 80 points from each score to get a new sample consisting of 1, 7, 9, 6, & 7. Mean and standard deviation for new sample were then computed to be M = 6 and s = 3. Determine the values of mean M and standard deviation s for original sample? What occurs to mean when you subtract constant from each observation?
Q2) There are 2 various formulas or methods which can be used to compute SS.
a) Under what situation is definitional formula easy to use?
b) Under what situation is the computational formula easy to use?
Could mud-wrestling be the cause of a rash contracted by University of Washington students in the spring of 1992? Two physicians at the University of Washington health center wondered this when one male and six female students complained of rashes..
Iindicate all samples are approximately Normal with no outliers. Is the ANOVA appropriate?
Compute a 95% confidence interval for the mean using the formula and where is the mean of the ten random numbers.
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study and gender differences were also to be investigated. One of the variables measured was the heart rate after..
Researchers are studying the absorption of two drugs into the bloodstream. Each drug is to be injected at three dosages. There are 24 people in the study, and they are randomly divided into six groups.
The variable recorded for each subject was the number of additional yards (possibly negative) that the subject could drive the ball by the end of the season. In the two-way ANOVA the DFM
Calculate descriptive statistics for each stock and the S&P 500. Comment on your results. Which stocks are the most volatile? Calculate the value of beta for each stock.
The world record time (in minutes) in the marathon is plotted versus the year in which the record was set for men and women separately. The plotting symbol o is used for men and x for women. The data include only records set between 1908 and 1988.
Would you expect the mean absolute percentage error to be more than or less than 0.25? Describe.
An advantage of the permutation test over the t test for a difference in means is that - distribution interval or a bootstrap percentile interval
A major benefit of two-way ANOVA over several one-way ANOVAs, If an F test for interaction is significant.
Use a scatter plot to determine the relationship between the x values and the y values.
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