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Random Variables, Binomial and Geometric Part 1 Flashcards | StudBud
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Random Variables, Binomial and Geometric Part 1
Random Variables, Binomial and Geometric Part 1
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1
Which of the following is NOT a requirement for a Geometric Random Variable?
Number of trials n is fixed in advance
Exactly two possible outcomes for each trial
Each trial is independent
Probability of success p for each trial is fixed
2
What does the 'B' in BINS represent?
Binomial-coefficient
Binary- there is a clear success and failure
Bivariate-data
Binary- only 0's and 1's
3
Is this a binomial distribution?
This is a binomial distribution
This is NOT a binomial distribution
4
You draw a card, replace it, then draw again until you get an Ace. # of draws = _____
Geometric Random Variable
Binomial Random Variable
Quadratic Random Variable
4
5
What does the 'N' in BINS represent?
Number- of successes
Number- set number of trials
Numbers-we need numbers to do math
Nothing
6
Which is true for a Binomial Distribution and
NOT
true for a Geometric Distribution?
An observation must have 2 outcomes: success or failure
The probability of success is the same for each observation
Observations are independent
There is a fixed # of observations
7
In a binomial experiment, outcome of each trial is _____________ from the others.
Independent
Unconditional
Conditional
Dependent
8
Multiple Choice Exams
A
B
D
C
9
When can we use binomial distribution to estimate a distribution that is not independent?
The sample is 1/100 or less the size of the population
The sample is 1/10 the size of the population
The sample is the same as the population
The population is 1/10 the size of the sample
10
If n = 10 and p =0.8, then the mean of the binomial distribution is _____?
10.8
0.8
10
8
11
μ=$4 and std.dev=$1 for lunch prices. The price goes up by $1. What are the new μ and S.D?
μ=$4 and S.D.=$1
μ=$5 and S.D.=$2
μ=$5 and S.D.=$1
μ=$4 and S.D.=$2
12
The expected value is synonymous with what feature of a RV probability distribution?
Mean
Spread
Variance
Median
13
Back to Basketball
D
C
A
B
14
How do you find the standard deviation of the sum of two random variables (assuming they are independent)?
Subtract the standard deviations
Subtract the variances, then find the square root
Add the variances, then find the square root
Add the standard deviations
15
How many outcomes can a binomial trial have?
0
2
1
4
16
Refer to the picture
.079
1
0
.894
17
Refer to the picture
.9849
.9571
.0796
.8775
18
Number of pages in your statistics textbook is a ____________ random variable.
Indiscrete
Discrete
Continuous
Discontinuous
19
Refer to the picture
.017
.989
.139
.149
20
Student Cards
D
C
A
B
