STA301 Quiz No.2 Shared by Uzma Komal

Question # 1 of 10 ( Start time: 07:56:50 PM ) Total Marks: 1
Among 18 articles, six having minor Defects and three have major defects. Determine the probability that an article selected at random has major defect.
Select correct option:
1/6
1/5
0.25
0.11


Question # 2 of 10 ( Start time: 07:57:47 PM ) Total Marks: 1
The deviation of a distribution from symmetry is called:
Select correct option:
Kurtosis                                ok
Skewness
Dispersion
Flatness


Question # 3 of 10 ( Start time: 07:58:14 PM ) Total Marks: 1
The variance of a sample of 81 observations is equal to 64; The standard deviation of these observations will be:
Select correct option:
256
4096
8
6561


Question # 4 of 10 ( Start time: 07:59:10 PM ) Total Marks: 1
Bowley’s coefficient of skewness for a certain data is ZERO. What is the shape of the distribution of data?
Select correct option:
Symmetrical                       ok
Asymmetrical
Uniform
Bi-modal


Question # 5 of 10 ( Start time: 07:59:57 PM ) Total Marks: 1
Moment ratio b1 is used to measure:
Select correct option:
Mean
Peakedness
Skewness            ok
Kurtosis


Question # 6 of 10 ( Start time: 08:00:46 PM ) Total Marks: 1
Which of the following is not a measure of central tendency?
Select correct option:
Percentile
Quartile
Standard deviation
Mode                    ok


Question # 7 of 10 ( Start time: 08:01:13 PM ) Total Marks: 1
When our data set contains a few very high or a few very low values we use ....... as a representaitve average.
Select correct option:
Mode
Mean
Median                                ok
All above

Question # 8 of 10 ( Start time: 08:02:01 PM ) Total Marks: 1
According to Chebychev’s rule, at least 8/9 of the data values will fall within:
Select correct option:
(Mean-S.D, Mean+S.D)
(Mean-2S.D, Mean+2S.D)
(Mean-3S.D, Mean+3S.D)                            ok
None of these


Question # 9 of 10 ( Start time: 08:02:57 PM ) Total Marks: 1
If P(A or B) = P(A)+P(B), then A and B are:
Select correct option:
Mutually exclusive events           ok
Independent events
Exhaustive events
Equally likely events


Question # 10 of 10 ( Start time: 08:03:48 PM ) Total Marks: 1
If a distribution has negative skewness, in what order (lowest to highest) will the averages be?
Select correct option:
mean, mode, median                    ok
mean, median, mode
mode, median, mean
median, mode, mean