Simplify the following expression:
1 answer:
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Answer:
Correct option: (A)
Step-by-step explanation:
The correlating linear model to investigate the use of text messaging over time is:
The general simple linear regression line is given by,
Here,
<em>α</em> = intercept of <em>y</em>,
<em>β</em> = slope (or regression) coefficient,
<em>X</em> = independent variable = number of years after 2006
<em>Y</em> = dependent variable = average number of text messages a person sends monthly.
The given regression line (or estimating line) is, .
The <em>y</em>-intercept is the expected mean value of Y when X = 0.
Compute the <em>y</em>-intercept as follows:
So, the <em>y</em>-intercept of 65 implies that in 2006 the average number of texts sent by a person is 65 texts per month.
Thus, the correct option is (A).