Question 402 pts right handed golfers will likely incur...

Question 402 pts Right-handed golfers will likely incur epicondylitis where? Group of answer choices B. lateral epicondylitis on the right side C. medial epicondylitis on the left side D. occurs with equal frequency on both sides of both arms A. lateral epicondylitis on the left side

Transcript

00:01 We're looking at a golf tournament and we have some information on the average number of strokes for the 13th pole.

00:08 Typically, the mean, mu, is 4 .25 and the standard deviation, sigma, is 1 .6.

00:16 We're looking at a sample of 64 golfers.

00:21 So we're not actually looking at the original distribution.

00:23 We're taking a sample of 64 and we're looking at the average number of strokes that they need.

00:30 So we're looking at a sample mean.

00:33 So it doesn't matter what the shape of the original distribution is.

00:36 We have a nice big sample here, oversized 30.

00:40 So the sample means are going to be approximately normal.

00:44 So if you take every possible sample of 64 golfers for this particular course, then you plot out the sample means, you get something approximately normal.

00:57 Okay, but we need to know the mean of the means and the standard deviation of the means.

01:01 While the mean of the means, mu x bar, is the same as the original distribution.

01:08 Some groups of golfers will be better than average, some will be worse than average, but the average of the averages should be the same as the population mean.

01:18 The standard deviation, however, of the average number of strokes for a sample of size 64 is going to actually be less than the original.

01:27 And the larger the sample, the less variation between sample means.

01:32 Because small outliers have less than effect.

01:37 And the formula is the standard deviation of sample means is equal to original standard deviation over root n.

01:44 So that's going to be 1 .6 divided by 8, which is 0 .2.

01:50 Okay, now i have an approximately normal distribution.

01:53 I can get rid of this and just look at my new distribution.

01:59 So i want the probability of the sample average being greater than 4 .75...

Question

Question 402 pts Right-handed golfers will likely incur epicondylitis where? Group of answer choices B. lateral epicondylitis on the right side C. medial epicondylitis on the left side D. occurs with equal frequency on both sides of both arms A. lateral epicondylitis on the left side

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