A study was done to investigate the use of text messaging over time. The correlating linear model is shown, where x represents the number of years after 2006, and y represents the average number of text messages a person sends monthly. Interpret the y-intercept.

A.

In 2006, a person sent an average of 65 text messages per month.

B.

In 2005, a person sent an average of 146 text messages per month.

C.

In 2005, a person sent an average of 65 text messages per month.

D.

In 2006, a person sent an average of 146 text messages per month.

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,

α = intercept of y,

β = slope (or regression) coefficient,

X = independent variable = number of years after 2006

Y = dependent variable = average number of text messages a person sends monthly.

The given regression line (or estimating line) is, .

The y-intercept is the expected mean value of Y when X = 0.

Compute the y-intercept as follows:

So, the y-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).

first anwser choice.

step-by-step explanation:

the greater/less or equal to symbol (> or < with the line at the bottom) is a closed/filled in circle.

-5c + 2 _< _27

subtract from both sides by 2

-5c _< _ 27

divide both sides by -5

c _< _ 5.4

flip the inequality sign

c _> _5.4

the only possible answer that would match the simplified inequality is the first answer choice

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb