The components of a time series which is attached to short term fluctuation is ________.

(a)

Secular trend

(b)

Seasonal variations

(c)

Cyclic variation

(d)

Irregular variation

Factors responsible for seasonal variations are ________.

(a)

Weather

(b)

Festivals

(c)

Social customs

(d)

All the above

The additive model of the time series with the components T, S, C and I is ________.

(a)

y = T + S + C × I

(b)

y = T + S × C × I

(c)

y = T + S + C + I

(d)

y = T + S × C + I

Least square method of fitting a trend is ________.

(a)

Most exact

(b)

Least exact

(c)

Full of subjectivity

(d)

Mathematically unsolved

The value of ‘b’ in the trend line y = a + bx is ________.

(a)

Always positive

(b)

Always negative

(c)

Either positive or negative

(d)

Zero