1. If a population mean is 300 and the sample mean is 400, the difference of 100 is called:
A.Standard error
B.Sampling error
C.Allowable error
D.None of the above.
2. Stratified Random Sampling involves:
A.Dividing the population into overlapping groups
B.Taking a random sampling of a percentage of the pre-chosen groups (usually 10%)
C.Choosing non-overlapping clusters (i.e. streets of a city) and collecting data from all members of the selected cluster
D.None of the above
3. Example/s of techniques used to describe data (descriptive statistics) is/are:
A.Median
B.Standard deviation
C.Correlation coefficient
D.All of the above
4. If we increase the confidence level
A.Confidence interval will also increase.
B.Confidence interval will not change.
C.Confidence interval will decrease.
D.None of the above.
5. In the regression equation, X indicates
A.the known value of the dependent variable
B.the amount of change in y with each change of one in the independent variable
C.the estimated value of the dependent variable when the independent variable is equal to zero
D.the known value of the independent variable
E.all of these