Reasons for Incorrect Statements for the Midterm Flashcards
1
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/988/787/q_image_thumb.png?1519568085)
A
0, 1, 2, 3, 4
2
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/988/809/q_image_thumb.png?1519568109)
A
0, 1, 2, 3, …, +∞
3
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/989/334/q_image_thumb.png?1519568138)
A
If X is discrete quantitative
4
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/989/356/q_image_thumb.png?1519568161)
A
The equality of the two probabilities hold only if the population mean is equal to 0
5
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/989/366/q_image_thumb.png?1519568733)
A
then P(X=1)+P(X=2)+P(X=3) = 1.0–P(X=0)
6
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/990/082/q_image_thumb.png?1519568805)
A
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/990/082/a_image_thumb.png?1519568816)
7
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/990/102/q_image_thumb.png?1519568834)
A
P(X ≥ 1) = 1 – P(X ≤ 1)
8
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/990/140/q_image_thumb.png?1519568862)
A
then 2P(Z ≤ a) – 1 = P( – a ≤ Z ≤ a)
9
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/990/186/q_image_thumb.png?1519569144)
A
then E(X) = np ≠ Var (X)
10
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/990/472/q_image_thumb.png?1519569162)
A
m is the population mean, but X ~ Po(m) is not symmetrical in general
11
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/990/515/q_image_thumb.png?1519569186)
A
then P(X ≥ 1) = 1 – P(X ≤ 1)
12
Q
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/990/525/q_image_thumb.png?1519569215)
A
![](https://s3.amazonaws.com/brainscape-prod/system/cm/232/990/525/a_image_thumb.png?1519569231)
13
Q
The distribution X ~ Bi(4, 0.5) is symmetrical with respect to 4.
A
is symmetrical with respect to 4 x 0.5 = 2
14
Q
P(X≤4) = P(X<3)+P(X=4) if X ~ Bi(5, 0.5)
A
= P(X ≤ 3) + P(X = 4)
15
Q
If X ~ Po(m), then Var(X) = m2
A
Var(X) = m