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Time Series & Trend · Question 60 of 68

Question 60

MediumOriginal question

The trend line of a town's population, in thousands, is y=25+1.8xy = 25 + 1.8x, with xx in years from 2023. What trend value does it give for 2020?

Options for question 60

Show the answer and explanation
CorrectNot quiteAnswer A

Correct answer: A

Explanation

  1. 2020 is 3 years before 2023, so x=−3x = -3.

  2. y=25−5.4=19.6y = 25 - 5.4 = 19.6 thousand.

Worth noting

30.4 uses x=+3x = +3, a year after the origin.

Concept
Estimating from the trend line
Typical time
90 s
Your time
—
The rule this testsA straight-line trend by least squares
Practise this chapter →

Ten questions from Time Series & Trend, at your own pace.

Practise this chapter →

Ten questions from Time Series & Trend, at your own pace.