Question 1 of 20
5.0 Points
Measures of dispersion:
A. provide information that allow comparisons between the spreads of two or more distributions.
B. cannot be calculated for grouped data.
C. convey information on how the data is clustered around the med
1. Compute the mean and variance of the following discrete probability distribution.
x
P(x)
2
.50
8
.30
10 .20
Work:
Mean = E(X)= 2(0.5)+8(0.3)+10(0.2)=1+2.4+2=5.4
V(X)=E(X^2)-E(X)^2
E(X^2)= 22(0.5)+82(0.3)+102(0.2)= 2+19.2+20=41.2
V(X)=41.2-5.42=12.04
An
Question 1 of 20
5.0 Points
When TV advertisements report that 2 out of 3 dentists surveyed indicated they would recommend Brand X
toothpaste to their patients, an informed consumer may question the conclusion because:
A. the results were incorrectly comp
Kate Moss famously does not say much in public, other than basic
bitch, so maybe her reticence is understandable. The silence of
Greens other 300 or so friends: not so much. Come in, Tess?
Leonardo? Gwyneth? Hello? Perhaps, given the star count,
showbusin