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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. A random sample of 7 students selected from a large class revealed the following scores: midterm 70, 62, 57, 68, 89, 63, 82 and on the final 80, 79, 87, 88, 85, 79, 91. We will test to determine if there evidence of an improvement on the final examination, at the 1% significance level. What is your test statistic?
Using the results, describe the effect of an outlier or extreme value on the confidence interval.
Compare and contrast random selection and random assignment. Be sure to include a discussion of when you would want to do one or the other and the possible consequences of failing to do random selection or random assignment in particular situation..
The closing price of a company's stock tomorrow can be lower, higher or the same as today's closed. Without any prior information that may affect the price of the stock tomorrow, the probability that it will close higher than today's close is 1/3
What is the 95% confidence interval for the true average number of hands per hour during peak hours?
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
Is there evidence of difference in median performance between two methods? (Use α = 0.05.)
Testing for Population mean - Based on this sample evidence, is Joan's supervisor correct? Use a = .05.
In performing the symmetric approximation, you calculate a mean of the total system cost as $1,725K. The variance is 22500. The POE is $1,600K.
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
Revenue and cost functions for producing and selling quantity x for certain production facility are given below. Find out profit function P(x).
Porphyrin is a pigment in blood protoplasm and other body fluids that is significant in body energy and storage. Let x be a random variable that represents the number of milligrams of porphyrin per deciliter of blood.
To perform a certain type of blood analysis, lab technicians must perform two procedures. The first procedure requires either 1 or 2 separate steps, and the second procedure requires either 1, 2, or 3 steps. a) List the experimental outcomes assoc..
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