WorksheetsData Analytics
Total questions: 10
Worksheet time: 8mins
What would happen to the mean if all the scores in a data set are subtracted by 10 ?
Decrease by 10
Increase by 10
Remain Same
Can’t say – depends on # data points
The standard deviation of a sample of 100 observations equals 64. The variance of the sample equals
8
10
64
4096
If the probability that an event will occur is 0.83, then the probability that the event will not occur is:
0.07
0.17
0.69
0.49
If the salary of professionals is inversely proportional to their age, it indicates ___________ relationship between the two variables?
Positive
No Correlation
Negative
Linear
Which of the following is not a measure of variability?
Variance
Standard Deviation
Median
Inter Quartile Range (IQR)
Which of the following is true about a 95% confidence interval of the mean
95% chances that the population mean will lie between the confidence interval limits
5% chances that the population mean will lie between the confidence interval limits
95 out of 100 samples in the data set have mean with in the confidence interval limits
All are true
Coefficient of Variance (CV) indicate the ratio of
Median over the mean
Standard Deviation over the mean
Range over the mean
Variance over the median
Which statement is incorrect for a normal distribution
+/1 Sigma limit from mean should have 68.26% of the observations
+/2 Sigma limit from mean should have 95.44% of the observations
+/3 Sigma limit from mean should have 99.9966% of the observations
Mean, Median and Mode should coincide
Calculating the difference between the largest and smallest numbers in a data set produces which figure ?
Mode
Sum
Range
Sum of Squares
What is the minimum possible value of the standard deviation ?
0
-100
3.4
6
