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The normal distribution is always bell shaped. The normal distribution is defined in terms of its mean and variance (standard deviation). The weight gain associated with an antidepressant is normally distributed with a mean of 6 lbs and a standard deviation of 3 lbs. What is the probability of weight gain? What is the probability of gaining between 0 and 12 lbs?
Determine the point estimate and 95% confidence interval for the mean family dental expenses of all employees of the company.
Suppose you were preparing two-way tables of percentages for the following pairs of variables. How would you run the percentages?
Explain why it is not appropriate to perform a formal inference procedure and yet it is still reasonable to conclude that the incidence rate is higher for gulf war veterans than for those who did not serve in the gulf war.
Rita rows 12 km upstream and 12 km downstream in 3 hours. The speed of her boat in still water is 9 km/hr. Find the speed of the stream.
Compute β-error of test in part (a) if true difference in mean burning rate is 2.5 centimeters per second.
Suppose a random sample of 25 swatches are selected. What is the probability that the mean of the sample is less than 235 pounds per square inch.
Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work so I can see how to do this for the future. This one is good example of what I can do in future for real estate.
For each lettered part, a through c, examine the two given sets of numbers. Without doing any calculations, decide which set has the larger standard deviation and explain why. Then check by finding the standard deviation by hand .
JBGHI demands a sample large enough to ensure an error of ± 2% with 90% confidence. What is the necessary sample size?
What is the 25th percentile of a chi squared distribution with 20 degrees of freedom? What symbol is used to denote this value?
Select another sample of 30 scores from the same population, what measure of central tendency is likely to vary least between your first and second sample?
The drug Ancrod was tested in a double-blind clinical trial in which subjects who had strokes were randomly assigned to get either Ancrod or a placebo.
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