Statistics Quiz Week4

University of Phoenix Material

Week Four Quiz

1A. WHICH OF THE FOLLOWING STATEMENTS ARE determine? (2 POINTS)

a. A normal distribution is any distribution that is not unusual. (no)

b. The graph of a normal distribution is bell-shaped. (yes)

c. If a existence has a normal distribution, the mean and the median are not equal. (no)

d. The graph of a normal distribution is symmetric. (yes)




B and D are correct




1b. Using the 68-95-99.7 rule:

Assume that a good deal of test tons is normally distributed with a mean of ascorbic acid and a standard deviation of 20. Use the 68-95-99.7 rule to watch over the following quantities (3 points):

Show your work as well as the result. You may find that drawing the distribution may serve up for this question.

a. helping of scores less than 100 = 50 %

34%+13.5%+2.35%+0.15%= 50%

b. congenator frequency of scores less than one hundred twenty = 84%

0.34+0.34+0.135+0.0235+0.0015 = .84 or 50%+34%= 84 %

c. piece of scores less than 140 = 97.5%

50%+47.5%=97.



5%

d. Percentage of scores less than 80 = 16%

50%-34%= 16%

e. Relative frequency of scores less than 60 = 2.5%

50%-47.5%= 2.5%

f. Percentage of scores greater than 120 = 16%

50%-34%= 16%





100 is in the middle of the axis
80 is 1 std to the left wing; 120 is 1 std to the right
68% is in between them
60 is 2 std to the left ; 140 is 2 std to the right
95% is in between them
40 is 3 std to the left ; 160 is 3 std to the right
99.7% is in between themIf you want to get a serious essay, order it on our website: Ordercustompaper.com



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