Review 5

Question 1

When do you use this variance formula sum of (x-xbar)squared/ n-1

Answer 1

Squared - used for sample (statistics)
- Hint - no probabilities will be given
- you only have x = observations
n= number of observations
x bar over top = mean

Question 2

When do you use this variance formula Sum(x-M)squared / N

Answer 2

Qsquared - used for population (statistics)

Question 3

When do you use this variance formula Var (x) = (n)(P)(1-P). And what does n and p stand for

Answer 3

When they give you the prob =p and n=number of trials only (probability)

Question 4

When do you use the variance formula Sum of (x-M)squared x F(x)

Answer 4

when you are given a list for x and probabilities for x which is f(x) (probability)

Question 5

Exactly so many use

Answer 5

Binomial or Poisson pdf

Question 6

At most

Answer 6

use Binomial or Possion CD

Question 7

At least

Answer 7

Use Binomial or Possion CD for less than the number you want. Ie At least 5, calculate for 4 and then 1 - your answer

Question 8

Calculator shows 2.5 to 10x-3 =

Answer 8

0.0025

Question 9

Calculator shows 2.5 to 10x3 =

Answer 9

2500.0