The symbol xo refers to:
a. the difference in the means of two independent populations.
b. one matched pairs difference.
c. the mean difference in the pairs of observations.
d. None of these choices.
Q. 2The term seasonal variation may refer to:
a. systematic patterns that occur during the period of one week
b. systematic patterns that occur over the course of one day
c. the four traditional seasons
d. All of these choices are true
Q. 3The number of degrees of freedom associated with the t-test, when the data are gathered from a matched pairs experiment with 10 pairs, is:
a. 10
b. 20
c. 9
d. 18
Q. 4Which of the four-time series component is more likely to exhibit the changes in stock market prices at particular times during the course of one day?
a. Long-term trend c. Seasonal variation
b. Cyclical variation d. Random variation
Q. 5If some natural relationship exists between each pair of observations that provides a logical reason to compare the first observation of sample 1 with the first observation of sample 2, the second observation of sample 1 with the second observation of sample 2, and so on, the samples are referred to as:
a. matched pairs.
b. independent samples.
c. nonrandom samples.
d. None of these choices.
Q. 6The time series component that reflects the irregular changes in a time series that are not caused by any other component, and tends to hide the existence of the other more predictable components, is called:
a. long-term trend c. seasonal variation
b. cyclical variation d. random variation
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