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İstatistik ve Olasılık
İstatistik ve Olasılık
19 terms
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StudBud Administration
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İstatistik ve olasılık konularında bilginizi test edin ve öğrenin
Flashcards
19 cards
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Practice quiz
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Questions
19
Answers
1
True or false: Discrete variables can be infinite.
False
True
2
True or false: Density curves must total one.
True
False
3
Which variable type uses integrals?
Discrete
None
Continuous
Both
4
True or false: Probability mass function lists probabilities.
False
True
5
Which function describes continuous variables?
None
CDF
PMF
PDF
6
True or false: E(XY) = E(X)E(Y) if X, Y are independent.
False
True
7
What is variance a measure of?
Mean
Spread
Median
Total
8
True or false: All random variables have a CDF.
True
False
9
What does the z-score indicate?
Total area
Variance
Standard deviations
Mean
10
What is a discrete random variable?
Counts
Continuous
Measurements
Infinite values
11
What shape is a normal distribution?
Linear
Bell-shaped
Circular
Square
12
True or false: Continuous variables have specific values.
True
False
13
Which is a property of expected value?
E(X+Y) = XY
E(X) = 0
E(XY) = X+Y
E(CX) = CE(X)
14
True or false: σ2 is the formula for variance.
True
False
15
True or false: Continuous variables are countable.
True
False
16
What does the cumulative distribution function do?
None
List outcomes
Integrate values
Sum probabilities
17
True or false: Expected value is always positive.
False
True
18
Which is not a property of the distribution function?
F(x) is always increasing
F(x1)≥F(x2)
P(a
P(X=x1)=0 if continuous
19
What does E(X) represent?
Sum
Variance
Probability
Expected value
