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A recent study investigated the association between heading a soccer ball and subclinical evidence of traumatic brain injury.5 Amateur soccer players were selected, and each completed a questionnaire to determine the number of times (x) they headed the ball in the last 12 months. In addition, each player was subject to diffusion-tensor magnetic resonance to measure the fractional anisotropy (FA, y). Suppose the estimated regression line was y = 20.00026x + 0.6877.
a. Find the expected value of y if the number of headers is 1000.
b. Find an estimate of an observed y value for x = 1200.
c. Suppose σ = 0.06. Find the probability that an observed y value is more than 0.5 when the number of headers is 750.
Compute the standard error of estimate, and interpret its meaning.
Compute the probability for the given frequency distribution.
A drug company is considering marketing a new local anesthetic. The effective time of the anesthetic the company is currently producing has a normal distribution with an average of 7.5 minutes and a standard deviation of 1.2 minutes.
What is an example of a normal distribution? please articulate what the example is (post the graph, picture of the graph, etc); discuss what the normal distribution means for this example, and how the graph is being used to articulate the problem.
What are the limitations of this analysis? Can you think of some hidden variables that could affect what you are seeing in the data?
What is the expected number of wins for the that upcoming month? LetX= number of games won in November 2005.
Evaluate the value of the F statistic for Devices- I plan an experiment to test the latest conflicting diet programs. The factor for Diet will involve three different levels: low fat, low carbohydrate, and low calorie. The other factor will involve..
Find a 90% confidence interval for the ratio of the variances of the delay times for the two vendors. (b) What assumptions are needed to solve part (a)?
consider the normal distribution of iqs with mean of 100 and a standard deviation of 16. what percentage of iqs are
test whether there is a significant difference in obesity in the us and canada. in a study of 500 americans the average
By removing one of these points, we could make the association appear to be stronger. Which point? Explain.- Would the slope of the line increase or decrease?
Draw the density curve corresponding to each of the following normal random variables, and then shade the area corresponding to the desired probability.
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