Math& 146
Assignment #3
(Chapters 10 and 4)
Solutions
1.
The table below shows the data on average movie ticket prices for various years.
Year
Ticket
Price
1971
$1.65
1975
$2.03
1980
$2.69
a)
Find the linear regression equation.
Let
x
be the number
of years since 1960.
Round each number to 2 decimal
places.

1985
$3.55
1990
$4.22
1995
$4.35
2000
$5.39
b)
Identify the slope.
Describe what it represents in the
context of the problem.

c)
Identify the
y
-intercept.
Describe what it represents in the context of the problem.

d)
Find the correlation coefficient, rounded to 4 decimal places.
How would you describe the correlation
between years and average movie ticket price?

e)
Using your linear regression, find the average movie ticket price for this year.