The high level of airline ticket sales that travel agencies experience during summer is an example of what component of a time series?
a. Long-term trend c. Seasonal variation
b. Cyclical variation d. Random variation
Q. 2In testing for the equality of two population variances, when the populations are normally distributed, the 10 level of significance has been used. To determine the rejection region, it will be necessary to refer to the F table corresponding to an upper-tail area of:
a. .90
b. .20
c. .10
d. .05
Q. 3Smoothing time series data by the moving average method or exponential smoothing method is an attempt to remove the effect of the:
a. trend component c. seasonal component
b. cyclical component d. random variation component
Q. 4The ratio of two independent chi-squared variables divided by their degrees of freedom is:
a. normally distributed
b. Student t-distributed
c. chi-squared distributed
d. F-distributed
Q. 5The model yt = Tt Ct St Rt that assumes the time series value at time t is the product of the four time series components is referred to as:
a. additive model c. moving averages model
b. forecast model d. multiplicative model
Q. 6Which of the following statements is correct regarding the percentile points of the F-distribution?
a. F.05,10,20 = 1/F.95,10,20
b. F.05,10,20 = 1/F.05,20,10
c. F.95,10,20 = 1/F.05,20,10
d. F.95,10,20 = 1/F.95,20,10
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