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A standardized productivity scale has a μ = 25 and a σ = 5. The CEO of the company wants to know if employee participation in company decisions has an effect on productivity. A sample of n = 75 employees participated in the decision-making process was administered the productivity scale with a resulting mean of 27. Does participation in company decisions have an effect on productivity? Use α = 0.01
Concept of statistical signi cance
In order to evaluate the rate of error experienced in reading chest x-rays, the following experiment is done. Several people with known tuberculosis (TB) status (through other reliable tests) are subjected to chest x-rays.
Simulate 50 observations from a normal distribution with mean 0 and standard deviation 1. make a normal plot.
four different kinds of radar systems designed to detect or monitor the airspace around a major airport for high flying
Discuss how to minimize the problems of fatigue, boredom, or practice effects in within-subject designs. This doesn''t have to be very long. Brief and clear with only about 150 words.
Calculate P(X . What is the probability that X will exceed 0.5? Given that X > 0.5, what is the probability that X will be less than0.75?
Olympic Track related question: You know the last 5 race times at the same distance for 8 runners competing in a race. As such, you can calculate the mean, sd, and variance for each.
A film alliance used a random sample of 50 U.S. citizens to estimate that the typical American spent 78 hours watching videos and DVDs last year. The standard deviation of this sample was 9 hours.
What does analysis of variance mean? One of the students answers this question as follows:
a standard 6-faced die is rolled twice in an experiment. let a and b be the outcome of the 1st and 2nd rolls
Random Sample: Before you begin your analysis you are required to take a random sample of size 110 from the 170 cases in the file. Use the file Random_Sample_Generator-13-2.xls to do this.
six hundred draws will be made at random with replacement from the box 0 0 1 . the number of 1s among the draws will be
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