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Level 3 Stats Flashcards | StudBud
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Level 3 Stats
Level 3 Stats
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Answers
1
Poisson distribution is known as
Continuous distribution of rare event
Distribution of rare event
Discrete data distribution with an average
Lambda distribution
2
Complementary events are two events with a combined probability of 1
True
False
3
Which one of the following is FALSE for Binomial and Poisson Distribution?
Both distribution apply to discrete variables
The events must occur simultaneously
The events/trials must be indepedent
Both distribution are right-skewed
4
What are the population parameters of normal distribution often used to calculate probability?
Mean and variance
Median and Standard Deviation
Mean and Standard Deviation
Variance and Standard Deviation
5
Binomial Distribution is a discrete data distribution
False
True
6
In Inverse Binomial Question, you are asked to find:
n
p
P(X=0)
n or p
7
When do we use the z-score formula for Normal Distribution?
To calculate missing variable
To calculate mean
To calculate standard deviation
All of the above
8
Which one of these statements are false?
Experimental probability is calculated by carrying out a simulation
Theoretical probability is calculated using a statistical model
True probability is always unknown
True probability means combining experimental and theoretical probabilities
9
How do you prove that two events are independent?
P(A) + P(B) - P(A∩B) = 0
P(A) + P(B) = P(A∩B)
P(A) x P(B) = P(A∩B)
P(A) x P(B) = P(AUB)
10
Which one is NOT a condition for Poisson
Each event is independent
Events occurs simultaneously
Events occur randomly
Probability of events is proportion to size of interval
11
Mutually exclusive events means
P(A∩B) = 0
P(A∩B) = P(A) + P(B)
All of the above
Nothing in common
12
What is the first step to complete a Venn Diagram?
Fill in the inner centre
Fill in the number outside the venn diagram
Let one probability be x
Tick off each percentage/probability as you go
13
What is the definition of uniform distribution?
Continuous data with a min, max and peak
Discrete data with a min and a max, same probability for all interval
Continuous data with a min and max, same probability for all interval
Discrete data with a min, max and peak
14
What is the main difference between observational study and experiment?
Population distribution
Population parameter
Sample size
Level of interference with subject
15
The factor doesn't contribute to the chance of a negative outcome if the relative risk is less than 1
True
False
16
Which one is NOT the condition for Binomial
Success rate constant
Fixed no. of trials
Two outcomes only
Random trial
17
What is the purpose of a simulation in Statistics?
To see if there is any variation in the results
All of the above
To compare between observed results and model results.
To test randomness
18
Which one is the most common sampling method?
Convenient sampling
Random simple sampling
Stratified sampling
Systematic sampling
19
To determine the validity of a claim from a study in Stats Report, which one you don't have to consider?
Confounding variables
Background of the researchers
Sampling method
Non-sampling bias
20
Normal Distribution only applies to variables that can be measured, not counted.
True
False
