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A random sample of size 25 is taken from a normal population having a mean of 80 and a standard deviation of 5. A second random sample of size 36 is taken from a different normal population having a mean of 75 and a standard deviation of 3. Find the probability that the sample mean computed from the 25 measurements will exceed the sample mean computed from the 36 measurements by at least 3.4 but less than 5.9. Assume the difference of the means to be measured to the nearest tenth.
A statistics professor would like to determine whether students in the class showed improved performance on the final exam as compared to the midterm examination.
One normal curve has mean 23 and standard deviation 1, a second normal curve has mean 5 and standard deviation 10. The curve that is more dispersed, or spread out, is
Find the range, standard deviation, and variance for the scores.
Calculate a 95% confidence interval for the population mean, based on the sample 10, 12, 13, 14, 15, 16, and 49. Change the number from 49 to 16 and recalculate the confidence interval. Using results, explain the effect of an outlier or extreme ..
The mean of a standard normal probability distribution.
Find the sample mean and sample standard deviation for the amount of unspent money returned at the end of the day.
How much variability will you have if you predict sales with this model?
Sample of 36 packages reveals mean weight to be 3.01 pounds, with standard deviation of 0.03 pounds. What is the estimated population mean?
Write out the multiple regression equation using the given data.
Your statistics instructor wants you to determine a confidence interval estimate for the mean test score for the next exam.
What the information do z-scores give that actual heights do no?
Evaluate the difference in the mean ratings and find the standard deviation of the difference in the ratings, what is the chance both children are boys?
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