additional 4 - review issues Flashcards
Geometric Mean : if you are given a rate what should you remember
that this is a percentage, not the growth factor and not the annual growth rate. You need 1 plus or 1- the % to get the growth factor
Geometric Mean: Which is the order
- Rate of return % , Growth Factor, Growth rate
How do you calculate growth rate
growth factor - 1, this is a percentage
How do you know what is the WI for the weighted mean
in GPA, its how many credits not the weight of the letters or If it is quality assessment and business school deans, use the # of business school deans for that category as the Wi (weight)
what is the mean growth rate if you invest in an asset and it goes down from 10,000 to 3,000 in the past 3 years
10,000 / 3,000 =3.33
then 3 square root of 3.33
the growth factor is 4.479910447
growth rate is 4.479910447 -1 = 3.4799
Not sure this is correct
What is the mean annual growth rate if you have an asset that is worth 10,000 5 years ago but now is worth 15,000
15,000 / 10,000 = 1.50
5 square root of 1.5 = 1.0845
Growth rate = 1.0845 - 1 =0.0845 or 8.45%
How do you calculate the mean if you have to use a midpoint
midpoint x frequency for the total
divide it by the total of the frequency
Can variance be negative?
yes, b/c it is the square root
ie, negative x negative = positive
What is the sum of the deviations from their mean
0
What is 6 Choose 3 look like in factorial
6! / 3!3!
for prob a, prob b,etc what do you use to find prob at least 1
1 - P(none) ?
for prob a, prob b,etc what do you use to find prob at both
P(ANB) - multiply
Probability question: Probability you do not get either
1-P(AUB)
1 minus the prob you get both
P(AUB) = P A or B or Both
You get B but not A
P(Ac)
P(B)
P(Ac) x P(B)
If A and B are mutually exclusive, then P(ANB) is
0
If A and B are mutually exclusive, then P(AUB)
P(A) + P(B)
If A and B are mutually exclusive, then P(A|B)
0
If A and B are mutually exclusive, then P(A|B)
0
Prob of A or B
P(AuB)
Prob of A or B
P(AuB)
if events A and B are mutually exclusive, If event A has occurred then the prob of B happening is
0
if you are given the mean but not the prob, what distribution is this likely
poisson
Hints that it is a possion distribution
- give you the mean and not the probability
- occurrence
- interval / time etc
What are the types of Bivariate distributions
- Binomial
- Poisson
- Hypergeometric
what does bivariate mean
2 variables
A contractor for CCR submitted a bid for a project. The Subcontractor felt at first they had a 50% chance of getting the job. But, CCR asked for more info on the bid. In the past, they noticed that for 75% of the successful bids CCR asked for additional info and that 40% were unsuccessful.
1. what is the prior prob?
- what is the conditional prob of a request for more info given that the bid will be successful?
- Compute the posterior probability that the bid will be successful given a request for additional info.
- 50%
- P(B|S) = .75
- P(B|S) = (.5.75)/ (.5.75)+(.5*.4)
