A test is being conducted to test the difference between two population means using data that are gathered from a matched pairs experiment. If the paired differences are normal, then the distribution used for testing is the:
a. normal distribution.
b. binomial distribution.
c. Student t-distribution.
d. F-distribution.
Question 2
The time series component that reflects variability over short repetitive time periods and has duration of less than one year is called:
a. long-term trend c. seasonal variation
b. cyclical variation d. random variation
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