Test 2

Question 1

What is the formula for the mean when working with general probability distribution (graph)

Answer 1

Sumx px

Question 2

What is the sd for general probably distributions

Answer 2

O= square root of (sum (x-u)^2 px)

Question 3

When drawing a histogram for a general probability distribution, which values go along the x axis and which values go along the y axis

Answer 3

X= x axis 
Px= y axis

Question 4

What is the formula for binomial problems for

Answer 4

P(r)= Cn,r p^r q^n-r

Question 5

How to tell if a problem is binomial or normal

Answer 5

If it is normal, it will say so in the question

Question 6

When to use binomialcdf or binomialpdf

Answer 6

Use pdf when the value is exact

Use cdf for all others

Question 7

How to find the mean of a binomial problem

Answer 7

U=np

Question 8

How to find SD of binomial problem

Answer 8

O= square root of (npq)

Question 9

What are the empirical rules?

Answer 9

68% of data will be 1 standard deviation away from mean

95% of data will be 2 SD away from mean

99.7% of data will be 3 SD away from mean

Question 10

In a normal distribution, how do we find the z score when n=1

Answer 10

X= x-u / o

Question 11

In a normal distribution, who do we find z score when n>1

Answer 11

Z= x(bar) - u (xbar) divided by o/ square root of n

Question 12

When finding mean of x bar, what equation do we use

Answer 12

U of x bar = u

Question 13

Find SD of x bar

Answer 13

O of x bar= o/square root of n

Question 14

How do we use invnorm?

Answer 14

(Area to the left that is already given, u, o)

Question 15

Invnorm only calculates to the ___

Answer 15

Left