Business Statistics Final Test

1. square foot square foot
DAY AMAZON APPLE amazonn earning monthly Apple monthly earnings
standard D
Standard D Amazon apple standard Deviatio
1 10.5 10.87 3.1 4.07 7.24 7.89
2 13.6 14.94 0.8 3.37 5.37 0.98
3 14.6 18.31 3.4 -3.23 8.13 3.57
4 18 15.08 2.5 1.41 15.13 0.0016
5 16 16.49 -3 -3.01 19.84 0.2
6 13 13.48 -3.5 1.47 17 0.3
7 9.5 14.95 3.1 0.1 8.59 2.43
8 8.8 15.05 0.2 -0.29 3.17 0.9
9 9 14.76 1 1.52 1.38 0.9
10 10 16.28 1.2 -0.5 3.18 0.18
11 11.2 15.78 6.8 0.67 9.72 4.08
12 18 16.45 -4.3 0.61 17.54 0.54
13 13.7 17.06 0.8 0.33 8.75 0.31
14 14.5 17.39 2.5 -1.07 15.73 21.43
15 17 16.32 13 5.45 140.77 43.7116
197.4 total= 27.6 10.9 4.21 0.67
Answer 1 Amazon Apple Amazonn answer 1 Answer 4 10.33 3.17
sample (n) 15 233.21 1.=95% confidence interval,Z? Increasing the confidence level increases the error bound,making the confidence interval wider.
z=1.96 95%= 1.96 YIELD MEDIAN
STDV 10.33 3.17 AMAZON Apple
Minim 10.5 10.87 24.67=mean -4.3 -3.23
Max 17 16.32 24.67+0.475+(10.33/3.74) -3.5 -3.01
median 8.8 15.05 27.905 -3 -1.07
mean 24.675 15.547 stav=10.33 0.2 -0.5
X 45 positvo 28,negativo 28 0.8 -0.29
z=95% 2.57 answer 2, Apple 0.8 0.1
varianza 0.92 0.38 99%,confidence interval, Z? 1 0.33
Error margin 2.71 0.83 99%=2.57, 1.2 0.61
NormDist 0.1744841 0.431500532 z=-0.495, z=+0.495 2.5 0.67
yield average 0.4643 0.389 mean=15.54 2.5 1.41
yield median 1.2 0.61 stav=3.17 3.1 1.47
15.54+0.495+(3.17/3.74) 3.1 1.52
0.847593583 3.4 3.37
21.34 6.8 4.07
positivo21.34,negativo21.34 13 5.45
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