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The mean of a normal probability distribution is 60; the standard deviation is 5.
a. About what percent of the observations lie between 55 and 65?
b. About what percent of the observations lie between 50 and 70?
c. About what percent of the observations lie between 45 and 75?
Draw the graph of the regression line on the same plot as the scatter diagram above.
A function sometimes associated with a continuous nonnegative random variable is the failure rate (or hazard rate) function which is defined as:
Calculate chi-square for the cross-tab. Show your work. Is there a statistically significant relationship between these variables?
Determine the probability that a randomly selected sample of 31 patients would produce an average diameter of 6.6 mm or less for the non affected tendon?
Interpret this data using regression and interpret all the findings, R 2 , F, IV coefficient, and the intercept.
Construct a 90 percent confidence interval for the true mean weight. Describe factors which might cause variation in the weight of Tootsie Rolls during manufacture.
Create the indicated confidence interval for population mean µ using a t- distribution.
A sample of 10 persons is used to measure the effectiveness of two massage techniques. The effectiveness of the techniques is measured by the number of days that pass by before the subjects feel the need for another massage session.
Taking care to control for weather conditions and other variables as much as possible. Define the null hypothesis.
A certain random experiment can result in one of four different possible outcomes, which we'll call A, B, C and D.
What is the standard deviation of expected returns for Stock X? For Stock Y?
What can we say about the probability distribution of x? Is it approximately normal? What are the mean and standard deviation?
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