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The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a mean of 5.2 inches and a standard deviation of .08 inch. Suppose a random sample of 20 balls is selected. Find the interval that contains 87% of the sample means.
Determine the probability in big class that both sections are covered? Only one section? Neither section? Determine the expected number of sections covered?
According to Chebyshev's theorem, proportion of values from data set that is further than 2 standard deviations from the mean is at most?
Interpret values of b1, b2, b3 and b4 in this estimated regression equation.
As we can say there is 5.5 percent chance of seeing the current policy having an effect on smog in the results we observed from natural sampling variation.
What quantitative method can be applied to help the Department make the decision? Outline how this method can be applied and explain how a qualitative method can also be applied to help the Department make the decision
She knows that 60% of the minerals have mass less than a certain amount m, and needs to select a random sample of n = 16 specimens for an experiment. With what probability will their average mass be less than the same amount m? (Hint: Calculate th..
At the start of the study the mean of the group was 24 and the end of the study the mean of the group was 30. The standard deviation of the difference scores was 12.0 and we had 16 subjects.
Determine the dependent variable(s)? Determine the value of the statistic? Write down the name of one variable not mentioned in this study that one might wish to control for.
We are certain the the average difference in reaction times between the two light types for all golfers is between 0.27 and 7.13.
The trail was repeated 54 times with 22 correct identifications and 32 wrong identification.
You know that all sociology majors study 2.5 hours per day with a standard deviation of 1.
Derive the formula for the expected value Y, derive the formula for the moment generating function of Y
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