Question

An experiment is run. The mass of an object is recorded over time.

Time (min)	Mass (g)
10	34
13	24
20	18
22	8
39	4

Plot the points in the grid.

Using your calculator, run a linear regression to determine the equation of the line of best fit. Round to two decimal places, use x for the variable.

y=______________

Using your equation, estimate the mass of the object at 50 minutes.

_________grams

Answer 1

let time be x

mass be y

= 104

n1 = 5

mean,

My = 20.8

= 88

n2 = 5

Mean,

My = 17.6

b)

y = -0.9522 + 37.4064

x = 50

y = - 0.9522 × 50 + 37.4064

= - 10.2036