STA301 Quiz Statistics [4]

STA301 Quiz Statistics

Question # 1
A discrete probability function f(x) is always:
Select correct option:

Zero
One
Negative
Non-negative


Question # 2
If f(x) is a continuous probability function, then P(X = 2) is:
Select correct option:

1
0
1/2
2


Question # 3
The range of the binomial distribution is:
Select correct option:


0, 1, 2, ………… 100
0, 1, 2, ………… n
0, 1, 2, ………… x
1,2, …………….n


Question # 4
In which of the following situations binomial distributions is approximate to normal distribution?
Select correct option:

n = 50, p = 0.01
n = 500, p = 0.001
n = 100, p = 0.05
n = 50, p = 0.02


Question # 5
The location and shape of the normal curve is (are) determined by:
Select correct option:

Mean
Variance
Mean & variance
Mean & standard deviation


Question # 6
A random experiment has five outcomes in its sample space {s1, s2, s3, s4, s5}. If P(s1)=0.2,P(s2)=0.3, P(s3)=0.1 and P(s4)=0.2 then P(s5)=?
Select correct option:

1
0.2
0.8
0.5


Question # 7
The joint density function f(x,y) will be a pdf if
Select correct option:

Both of integrals f(x,y) dx dy =1
Both of integrals f(x,y) dx dy >1
Both of integrals f(x,y) dx dy <1
Both of integrals f(x,y) dx dy =0


Question # 8
Which of the following is correct property for joint probability distribution of X and Y:
Select correct option:

Sigma f(X,Y)=1
Sigma f(Y,X)=1
Both of above
None of above


Question # 9
A random variable that can assume every possible value in an interval [a, b]:
Select correct option:

Discrete variable
Continuous variable
Qualitative variable
Categorical variable


Question # 10
Normal approximation to the binomial distribution is used when:
Select correct option:

np>5
nq>5
Both of the above
None of the above