Match the histogram with the appropriate...

Match the histogram with the appropriate information. Frequency 20 15 10 5 5 10 15 20 25 30 35 40 45 50 A. The mean is 30, and the standard deviation is 10.5. B. The mean is 25, and the standard deviation is 4.5. C. The mean is 30, and the standard deviation is 4.5. D. The mean is 35, and the standard deviation is 10.5.

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Transcript

00:01 In this video, we're asked to look at a histogram, a normal quartile plot, and a min tab printout to figure out if our information is indeed behaving normally.

00:13 So the histogram is hard to recreate by hand.

00:16 But if you take your pencil or imagine drawing your pencil over the histogram, it does appear to be symmetrical on both sides.

00:25 So this would be yes, because there is an appearance of symmetry on.

00:32 Both sides.

00:34 Then for the quartile plot, remember, we're looking to see if it forms a line or very close to a straight line, and this does, so that would also be a yes.

00:43 Then the next thing we're asked to do is to calculate the intercortile range, which is the difference between q3 and q1.

00:51 So when you look at min tab, just locate q1, which is 29.

00:56 Q3 is 31.

00:58 When you subtract the two, you find that your intercore trial range is two.

01:03 So then to determine if we have an outlier, we'll take q1 minus 1 .5 times 2.

01:15 So if we have any value below 26, we have an outlier.

01:20 And we see that the minimum value for our data is 27.

01:23 So we don't have to worry about that.

01:26 On that side, so let's check to make sure that we don't have an outlier above.

01:33 So 31 plus 3, which, we'd give us 34...

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