# Statstics:Multiple choice question

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What is the "up-and-down" variation, the periods of prosperity followed by recession that occurs over extended periods of time?

a. secular trend

b. seasonal variation

c. cyclical variation

d. irregular variation

What is the variation within a year called? This is variation, such as high sales at Christmas and Easter and low sales in January.

a. secular trend

b. seasonal variation

c. cyclical variation

d. irregular variation

A linear trend for time series data beginning in 1995 and extending up through 2001 is Y' = 5.2 + 3.1X. The forecast for 2002 is

a. 23.8

b. 26.9

c. 30

d. 21.7

The least squares equation for sales data going from 1995 to 2001 is Y' = 10 + 1.3t. What is the plot for the year 1999?

a. t = 6, y = 17.8

b. t = 0, y = 10.0

c. t = 4, y = 15.2

d. t = 10, y = 0.0

The linear trend equation developed for the annual sales (in $thousands) of the Jordan Manufacturing Company is: Y' = 500 + 60t. By how much are sales increasing per year?

a. $60,000 per year

b. $6,000 per month

c. $500,000 per year

d. $6,000 per year

The linear trend equation developed for the annual sales (in $thousands) of the Jordan Manufacturing Company is: Y' = 500 + 60t. By how much are sales increasing per year?

a. a

b. b

c. X

d. Y'

You can describe the moving average method as:

a. Useful in smoothing a time series

b. Used in measuring seasonal fluctuations

c. A technique which does not result in an equation

d. All of the above

How many years would be lost in a three year moving average for an annual time series?

a. 2 at the start and 1 at the end

b. 1 at the start and 1 at the end

c. 2 at the start and 0 at the end

d. 0 at the start and 2 at the end

How will data that increases or decreases by equal percents appear when plotted on an arithmetic scale?

a. Straight line

b. linear

c. curvilinear

d. both a and b are correct

A logarithmic trend equation should be used for forecasts when the time series is increasing by:

a. equal amounts

b. increasing percents

c. increasing amounts

d. decreasing percents

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