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p/ledge.apus.edu/portal/site/309110/page/1d70d746-8716-478a-bc7c-4950149odd31 Question 18 of 20 1.0 Points Accepted characters: numbers, decimal point markers (period or comma), sign idcators EMes (e g, as or "e" (used in scientific notation). NOTE: For scientific Complex numbers should be in the form la + bi where "at and "o need to have exdlicity stated vaues For example: {1+1) is valid whereas {1+i) is not {0 is vaid whereas (9) is not al point markers (period or comma), sign indicators (-, spaces (e.g. as thousands separator, 5 000), 'E notation, a period MUST be used as the decimal point marker S ) a not (o-9lI vaild wr The tollowing data represent the number of children in a sampe of 10 tamiles tom Chica 42. 1.1.5.3.0. 1.0 and 2 ot 10 families trom Chicago: 4, 2, 1. 1,5.3,0. 1,0, and 2 Compute the variance of the data. Place your answer, rounded to two decimal places, in the blank For example, 3.45 would be a legitimate entry to two dencimal placen. I nhe blank Ffor exampose.3.45 would bo a segtinas Part 3 of 3- 1.0 Points Question 19 of 20 If we draw a straight line through the points in a scat relationship between the two variables. True False 1.0 Points but a tew pui down the clas averege,the hintogram cdesemting th to Question 20 of 20 If you are in a class where most students do reasonably well on a test but a few pull down the class do roasonably well on a test but a tew pull down the class average, the histogram desaribing the teset scores will indicate a positively-skewed distribution. True FalseExplanation / Answer
18.
Getting the mean, X,
X = Sum(x) / n
Summing the items, Sum(x) = 19
As n = 10
Thus,
X = 1.9
Setting up tables,
x x - X (x - X)^2
4 2.1 4.41
2 0.1 0.01
1 -0.9 0.81
1 -0.9 0.81
5 3.1 9.61
3 1.1 1.21
0 -1.9 3.61
1 -0.9 0.81
0 -1.9 3.61
2 0.1 0.01
Thus, Sum(x - X)^2 = 24.9
Thus, as
s^2 = Sum(x - X)^2 / (n - 1)
As n = 10
s^2 = 2.766666667 = 2.77 [ANSWER, VARIANCE]
19.
TRUE. [ANSWER]
**************************
20.
FALSE. [ANSWER]
There are a few low scores, so it is negatively skewed.
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