In testing the difference between the means of two normally distributed populations, the number of degrees of freedom associated with the unequal-variances t-test statistic usually results in a non-integer number. It is recommended that you:
a. round to the nearest integer.
b. change the sample sizes until the number of degrees of freedom becomes an integer.
c. assume that the population variances are equal, and then use df = n1 + n2 - 2.
d. None of these choices.
Question 2
Seasonal variation is one of the four different components of a time series. These are cycles that occur over short repetitive calendar periods and, by definition, have duration of less than one year.
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