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Stat Review 4 Flashcards | StudBud
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Stat Review 4
Stat Review 4
20 terms
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15 plays
Probability intro
Flashcards
20 cards
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Practice quiz
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Questions
20
Answers
1
Which is an example of a potentially biased sample?
Stratified Sample
Voluntary Sample
Simple Random Sample
Clustered Sample
2
What is the notation of the BLUE shaded region in the diagram?
1 - Ac
Ac
1 - (Ac ∩ Bc)
A
3
T/F: An observational study records a group; whereas an experiment gives treatment then records
True
False
4
P( A | B) , in English, translates to...
Probability of A and B
Probability of A; given condition B
Probability of A or B
Probability of B complement
5
If we have mutually exclusive events; P(A ∩ B) will equal
P(A) + P(B)
P(A U B) - P(A) - P(B)
0
P(A U B)
6
Statistic A is independent of a condition B if, and only if...
P(A) < P(A | B)
P(A) = P(B)
P(A) > P(A | B)
P(A) = P(A | B)
7
The Box surrounding our Venn diagram in our probability graph represents...
1 - (A ∩ B)
The rest of our sample space S
0
1 - (A U B)
8
A fair die can simulate events of what probability?
1 in 6
1 in 9
1 in 4
1 in 5
9
True or False: In order to use conditional probability the problem doesn't need a 'given'.
False
True
10
To find a probability in a sample space, We use our event (A) and our sample Space (S) to find
# results in S / Probability of A
# results in A / (1 - S)
1 - (# results in A + Total results in S)
# results in A / Total results in S
11
When we use a computer or device to predict outcomes of something we cannot test, we are ____
Using Conditional Probability
Pretending to be good at Statistics
Gathering Data of Real Results
Using a Simulation
12
What is the reason to use Random Sampling when recording about a population?
It shows less bias
It is more specific to a sample within a population
It is better
It better represents the population
13
Our Sample Space; or all our possible outcomes, will ALWAYS sum up to ___.
1
100%
1%
100
14
We flip a fair coin and get heads. What is the probability that we get heads again?
0.33
0.5
0.25
1
15
Which of the following does NOT apply to our population of study: Restaurant chains?
McDonald's
Subway
Taco Bell
7-11
16
A deck of cards can simulate what following probability?
1 / 52
1 / 4
1 / 13
1 / 9
17
When we record statistics; we make inferences on a ______ by recording or surveying a sample.
Population
Random Stratified Sample
Person
Trend
18
If P(A) = 0.2 , What other equation below would also equal 0.2?
Bc
1 - P(A)
P(Ac)
1 - P(Ac)
19
If we have mutually exclusive events; P(A U B) will equal...
P(A ∩ B)
1
0
P(A) + P(B)
20
When we have no conditions, we use the total population. When we have a condition, we use a...
Different Total
Conditional Probability
Marginal Distribution
Portion of the Graph/Table
