Using Statistics to Predict

1
Page 584

• Lesson 8-5
• 1-10

2
Using Statistics to Predict

• Whats percent got to do with it?

3
When asked their favorite time to getaway, 40 of
adults say summer is the ultimate time to take a
trip.  Spring and fall tie for second at 16,
while the frigid winter months come in last at
12.
There are 65 adults who work at WMSHow many
would you expect prefer taking a winter vacation?
All Statistics from Rasmussen Reports
4
Since 12 prefer winter vacations.. 12 of the
65 adults at WMS should prefer winter vacations
12 of 65 .12 x 65 7.8
Since you cant have .8 of a person we would
round to 8 people prefer winter vacations.
5
According to the Rasmussen Report, 40 of adults
prefer summer vacations. How many WMS Staff
would prefer summer vacations?
40 of 65 26 staff members
6
Poll 17 of Computer Users Will Buy Vista Soon
Of the 65 adults working at WMS, how many would
you expect to upgrade to Vista?
17 of 65 11.05 OR 11 people
7
(No Transcript)
8
5 prefer Soccer.WMS has 539 students. How many
should pick soccer as their favorite sport?
27 students
45 prefer baseball..how many WMS students
should pick baseball as their favorite sport?
243 students
9
The are approximately 145 million working
adultshow many walk or ride a bike to work?
5,800,000 ride a bike or walk to work
10
Statistics Vocabulary

• Survey a question or set of questions designed
  to collect data about a specific group of people
• Population the group youre collecting
  information about. Example middle school
  students
• Random Sample a sample chosen without preference

11
If you survey a random sample of a population,
you can assume the sample represents the
population and you can use the results to make
predictions about the population.
12
What is your favorite subject?
number
Percent
13
How much allowance do you get each week?
number
percent
14
Your turn

• Page 59 in your workbook