the US. They found data were searching the internet to find information on air t
ID: 3358858 • Letter: T
Question
the US. They found data were searching the internet to find information on air travel in the number of to the data. The below. The LSresiduals and part of the computer output for their regression are given commercial aircraft flying in the US during the years 1990-1998. The dates were recorde us the year 1990 was recorded as year 0. They fit a least squares regression line ars since 1990. Th yielded a correlation coefficient of 0.86. 40 30 10 -10 -30 -5o Predictor Coef Stdev tratio Constant 2939.93 2055 143.09 0.000 Years 233.517 4316 54.11 0.000 s 33.43 (a) Comment on the appropriateness of using linear regression on this data (b) What is the predicted number of commercial flights flying in 19922 (c) What is the actual number of commercial flights flying in 19927Explanation / Answer
a)
Correlation coeff = 0.86 which is quite high. Hence the linear regression can be used.
b)
Regression line
y = 2939.93 + 233.517*x
for x = 2
y = 2939.93 + 233.517*2 = 3406.964
c)
Actual number = 3406.964 + 40 = 3446.964
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