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A sample of 3000 observations has a mean of 82 and a standard deviation of 16. Using the empirical rule, find what percentage of the observations fall in the intervals , and x+/- 1s, x+/- 2s x+/- 3s.
Using data provided, test if there is a difference between means at alpha =.05.
The following data were collected as part of a study of coffee consumption among male and female undergraduate students. The following reflects cups per day consumed:
What is the probability of selecting a store at random and finding it has both a pharmacy and a floral shop?
Two balanced dice are rolled and the number of dots facing up is added. Find the probability that the sum is 10 or 12.
Use the Poisson Distribution the indicated probabilities in one year, there were 116 homicide deaths in Richmond VA. For a randomly selected day
The 90% confidence interval to estimate the true average difference in nationwide sales quantity before the ad campaign and after is (0.39, 16.64). Which of the following is the appropriate conclusion? The differences were calculated as (after ad ..
A IRS auditor randomly selects 3 tax returns from 57 returns of which 6 contains errors. What is the probability that she selects none of those containing errors?
If the production process is in control, the mean number of chips per cookie is 6.0 What is the probability that in any particular cookie being inspected. What is probability that in any partcular cookie being inspected, there are less than 4 choco..
if tow televisions are randomly selected, compute the probability that both televisions work. what is the probability that at least one does not work?
A random sample of 12 paired observations indicated a correlation of .32. Can we conclude that the correlation in the population is greater than zero? Use the .05 significance level.
Bicycle helmet use. Table lists data from a cross-sectional survey of bicycle safety. The explanatory variable is a measure of neighbourhood socioeconomic status (variable_RFM). The response variable is "percent of bicycle riders wearing a helmet"..
Archaeopteryx is an extinct beast having feathers like a bird but teeth and a long bony tail like a reptile. Five fossil specimens have preserved both the femur and humerus bones. The measurements (in centimeters) for each bone are given below.
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