# Question

Refer to the Southern Economic Journal (Apr. 2008) rankings of Ph.D. programs in economics at 129 colleges and universities, Exercise. Recall that the number of publications published by faculty teaching in the Ph.D. program and the quality of the publications were used to calculate an overall productivity score for each program. The mean and standard deviation of these 129 productivity scores were then used to compute a z-score for each economics program. The data (z -scores) for all 129 economic programs are saved in the ECOPHD file. A MINITAB normal probability plot for the z -scores is shown in the accompanying printout.

a. Use the graph to assess whether the data are approximately normal.

b. Based on the graph, determine the nature of the skewness of the data.

a. Use the graph to assess whether the data are approximately normal.

b. Based on the graph, determine the nature of the skewness of the data.

## Answer to relevant Questions

Why do we need a correction for continuity when approximating a binomial probability with the normal distribution? In Exercise, you learned that 32% of all births in the United States occur by Caesarian section each year (National Vital Statistics Reports, Mar. 2010). In a random sample of 1,000 births this year, let x be the number that ...The random variable x can be adequately approximated by an exponential probability distribution with θ = 2. Find the probability that x assumes a value a. More than three standard deviations from μ. b. Less than two ...Find a z -score, say, z0, such that a. P(z ≤ z0) = .8708 b. P(z ≥ z0) = .0526 c. P(z ≤ z0) = .5 d. P(-z0 ≤ z ≤ z0) = .8164 e. P(z ≥ z0) = .8023 f. P(z ≥ z0) = .0041 Refer to the Teaching Psychology (May 1998) study of how external clues influence performance, presented in Exercise. Recall that two different forms of a midterm psychology examination were given, one printed on blue paper ...Post your question

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