题目内容

Six years ago material M cost $10 per kg and the price index most appropriate to the cost of material M was 130. The same index show stands at 510.What is the best estimate of the current cost of material M per kg?

A. $2.55
B. $29.23
C. $39.23
D. $51.00

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What is the purpose of seasonally adjusting the values in a time series?

A. To obtain an instant estimate of the degree of seasonal variatio
B. To obtain an instant estimate of the trend
C. To ensure that seasonal components total zero
D. To take the first step in a time series analysis of the data

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A. i and ii
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Six years ago material M cost $10 per kg and the price index most appropriate to the cost of material M was 130. The same index show stands at 510.What is the best estimate of the current cost of material M per kg?

A. $2.55 B. $29.23 C. $39.23 D. $51.00

What is the purpose of seasonally adjusting the values in a time series?

Which of the following are components of a time series analysis?i. Trendii. Seasonal variationiii. Cyclical variation

Under which of the following circumstances would a multiplicative model be preferred to an additive model in time series analysis?

如要确诊大肠杆菌，常采用

A. $2.55
B. $29.23
C. $39.23
D. $51.00