Sample Distribution Model for Mean? - automatic teller machine models
Show Recipes ATM withdrawals that customers have a skewed distribution, with an average of 72 $ and a standard deviation of $ 10. On behalf of the withdrawal is for the next 200 customers in the machine. Describe the sampling distribution model of this medium.
A. N (5.1, 10)
B. The distribution is uneven, with an average of 72 $ and a standard deviation of $ 10.
C. S (72, 0.7)
D. N (72, 10)
E. There is not enough information to describe the distribution
I know it is not D. Please Help!
Monday, February 22, 2010
Automatic Teller Machine Models Sample Distribution Model For Mean?
1 comment:
The answer is C.
Here's why:
For the normal distribution, N ~ (mean, standard deviation) for the pop --
Because (we treat the sample as indicated in the last sentence) are less than 200 people n () = sample size.
Thus, the default is 10, but in view of the sample, because there is an n, the standard changes to half of the same () / sqrt (n)), that is ...:
(10) / sqrt (200)), which corresponds to 0.7.
Thus, the average remains the same and the new standard (SD) is 0.7, which makes your answer C.
Good luck with the rest of the HW!
Post a Comment