Question

UP TO 50 POINTS ON BRAINLY

TASK

Mobile phone usage has been steadily increasing The data below shows the mobile phone usage in (Millions ) base on years

1994- 37. 5 million users
1998- 70 million users 2002 - 102.5 million user

Performance Task :
You are to to the director of marketing that discusses your predications for phone usage and why you that it would be good for your company to get involved in the mobile phone industry include the following in your report

- The equation of the line of best fit based on the data above

- An interpretation of the value the slope and the y-intercept

- The reliability of your model

- A prediction for the amount phone usage two years from today

Answer 1

Answer:

273.075 millions users

Step-by-step explanation:

We can use the date and users as x and y values for our graph.

point 1 = (1994, 37.5)

point 2 = (1998, 70.0)

point 3 = (2002, 102.5)

We know that linear equation can be represented as y = mx + b

where m is the slope and b is the y intercept value when x equal to 0.

m = (y2 -y1)/(x2-x1) = (102.5 - 37.5)/(2002 -1994)

m = 8.125

Now let's solve for b by using point3 values.

102.5 = 8.125(2002) +b

b = -16163.8

Now predict two years from now.  Which is the year 2023.

For year 2023, how many mobile phone usage?

y = 8.125(2023) - 16163.8

y = 273.075 millions users

As for model robustness(reliability), it's fairly good be cause all three data points have consistent 8.125 slope.  So the predictivity is fairly accurate.