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STA 301 Quiz # 01 Opening date 20-11-2014 close date 21-11-2014 11.59pm Share your quizes and discuss
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1. A quantity obtained by applying certain rule or formula is known as
Select correct option:
Estimate
Estimator
2. Criteria to check a point estimator to be good involves
Select correct option:
Consistency
Unbiasedness
Efficiency
Above all pg 258
3. The F-distribution always ranges from:
Select correct option:
0 to 1
0 to -8
-8 to +8
0 to +8
5. Parameter is a ………quantity.
Select correct option:
Constant
Variable
6. To find the estimate of a parameter…….methods are used.
Select correct option:
Two
Three
Four
Many
7. A failing student is passed by an examiner. It is an example of:
Select correct option:
Type I error
Type II error
Correct decision
No information regarding student exams
8. For two mutually exclusive events A and B, P (A) = 0.2 and P (B) = 0.4, then P(AUB) is:
Select correct option:
0.8
0.2
0.6
0.5
P(AUB)=P(A)+p(B)=0.2+0.4=0.6
9. An urn contains 4 red balls and 6 green balls. A sample of 4 balls is selected from the urn
without replacement. It is the example of:
Select correct option:
Binomial distribution
Hypergrometric distribution
Poisson distribution
Exponential distribution
10. A standard deck of 52 cards is shuffled. What is the probability of choosing the 5 of diamonds:
Select correct option:
1/5
1/13
1/52
11. If P(AnB) = 0.12 P (A) = 0.3, find P (B) where ‘A’ and ‘B’ are independent:
Select correct option:
0.1
0.2
0.3
0.4
0.3X0.4=0.12
12. The mean deviation of the normal distribution is approximately:
Select correct option:
7/8 of the S.D
4/5 of the S.D
3/4 of the S.D
1/2 of the S.D
13. We use the Poisson approximation to the binomial when:
Select correct option:
p is 0.01 or less & n is 10 or more
p is 0.05 or less & n is 20 or more pg221
p is 0.04 or less & n is 15 or more
p is 0.02 or less & n is 10 or more
14. The conditional probability P (A\B) is:
Select correct option:
P(A n B)/P(B) pg157
P(A n B)/P(A)
P(A U B)/P(B)
P(A U B)/P(A)
15. We use the General Rule of Multiplication to combine:
Select correct option:
Events those are not independent
Mutually exclusive events
Events that total more than 1.00
Events based on subjective probabilities
in me say koi b q nhe aya .. mean and medain pahar loo .. quiz complete ho jai ga bas thora sa ...
D_Asif please dnt confuse the students jo question ap nay share keye hain ya last k chapters k hain and quiz number 1 is from lesson 1 to 9.. andha dhund copy paste mat mar dia karo..
16. Which statement is NOT CORRECT?
Select correct option:
The sample standard deviation measures variability of our sample values
A larger sample will give answers that vary less from the true value than smaller samples
The sampling distribution describes how our estimate (answer) will vary if a new sample is taken
A large sample size always gives unbiased estimators regardless of how the sample is chosen
17. Probability of an impossible event is always:
Select correct option:
Less than one
Greater than one
Between one and zero
Zero
18. The number of parameters in uniform distribution is (are):
Select correct option:
12
pg 224
34
19. The probability can never be:
Select correct option:
1 1/2
1 -
1/2
20. The conditional probability P (A\B) is:
Select correct option:
P(A n B)/P(B)
P(A n B)/P(A)
P(A U B)/P(B)
P(A U B)/P(A)
21. A random sample of n=25 values gives sample mean 83. Can this sample be regarded as drawn
from a normal population with μ= 80 and s= 7? In this question the alternative hypothesis will
be:
Select correct option:
H1: μ = 80
H1: μ ? 80
H1: μ > 80
H1: μ <80 pg 278
22. If f(x) is a continuous probability function, then P(X = 2) is:
Select correct option:
10 1/2
2
23. The binomial distribution is negatively skewed when:
Select correct option:
p>q pg 214
p<q
p=q
p=q=1/2
24. If we roll three fair dices then the total number of outcomes is:
Select correct option:
6 36
216
1296
6^3=216
25. When we draw the sample with replacement, the probability distribution to be used is:
Select correct option:
Binomial
Hypergeometric
Binomial & hypergeometric pg 219
Poisson
26. The moment ratios of normal distribution come out to be:
Select correct option:
0 and 1
0 and 2
0 and 3 pg 226
0 and 4
27. The probability of an event is always:
Select correct option:
less than 1
between o and 1
greater than 1
28. Symbolically, a conditional probability is:
Select correct option:
P(AB)
P(A/B)
P(A)
P(AUB)
29. Suppose the test scores of 600 students are normally distributed with a mean of 76 and
standard deviation of 8. The number of students scoring between 70 and 82 is:
Select correct option:
272
164
260
328
30. If P (A) = 0.3 and P (B) = 0.5, find P (A/B) where ‘A’ and ‘B’ are independent:
Select correct option:
0.3
0.5
0.8
0.15
31. An urn contains 4 red balls and 6 green balls. A sample of 4 balls is selected from the urn
without replacement. It is the example of:
Select correct option:
Binomial distribution
Hypergrometric distribution
Poisson distribution
Exponential distribution
32. If the second moment ratio is less than 3 the distribution will be:
Select correct option:
Mesokurtic
Leptokurtic
Platykurtic pg 226
None of these
33. For the independent events A and B if P (A) = 0.25, P (B) =0.40 then P (A and B) =……
Select correct option:
0.65
0.1
0.50
0.15
P(A)*P(B)0.25*0.40=0.1
34. A set of possible values that a random variable can assume and their associated probabilities of
occurrence are referred to as __________.
Select correct option:
Probability distribution
The expected return
The standard deviation
Coefficient of variation
35. A random variable X has a probability distribution as follows: X | 0 1 2 3 P(X) | 2k 3k 13k 2k
What is the possible value of k:
Select correct option:
0.01
0.03
0.05
0.07
36. The probability of drawing any one spade card is:
Select correct option:
1/52
4/52
13/52
52/52
37. The function abbreviated to d.f. is also called the......
Select correct option:
Probability density function
Probability distribution function pg 172
Commutative distribution function
Discrete function
38. Binomial distribution is skewed to the right if:
Select correct option:
p=q
P<q
p>q
p=n
39. A discrete probability function f(x) is always:
Select correct option:
Zero
One pg 172
Negative
Non-negative
40. For a binomial distribution, n= 10 & q= 0.6, the mean of the distribution is:
Select correct option:
0.6
6.0
10
4
P=1-q
1-0.6=0.4,
mean =np10*0.4=4
41. In the FA examination, 24candidates offered Statistics. If the probability of passing the subject
be 1/3, what will be the mean of the distribution?
Select correct option:
7865
42. The probability that a certain machine will produce a defective item is 1/4. If a random sample
of 6 items is taken from the output of this machine, what is the probability that there will be 5
or more defectives in the sample?
Select correct option:
3/4096
18/4096
19/4096
4/4096
43. Probability of type II error is
Select correct option:
a
B pg 276
1-a
1-B
44. If the values of variables are increasing or decreasing in the same direction then such kind of
correlation is referred as
Select correct option:
Zero Correlation
Perfect Correlation
Positive Correlation
Negative Correlation
45. The moving averages of the Prices 55,60,65,70 are
Select correct option:
70, 75
60, 65
65,65
70,60
46. The best measure of variation is
Select correct option:
Range
Quartile deviation
Variance
Coefficient of variance
47. Ms. Christian calculated a correlation coefficient of .75. Which of the following reflects the
best interpretation of this?
Select correct option:
Weak negative.
Strong negative.
Weak positive.
Strong positive.
48. ………use the division of a circle into different sectors. Select correct option:
Line graph
Sector graphs
Frequency Polygon
Conversion Graphs
49. The measurement of measure of degree of to which any two variables vary together is called
Select correct option:
Regression Coefficient
Correlation
Both (a) and (b)
None of these
50. Analysis of Variance (ANOVA) is a test for equality of:
Select correct option:
variances
means
proportions
only two parameters
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