You must first poll fellow students from around the school, getting at least 10 people who fit the criteria set in class (eg. you might only be allowed to poll people whose last name starts with letters from A – F).
The two questions you will ask your fellow students are:
how many hours do you watch TV on an average week?
how many hours do you spend on the internet (surfing, IMing, on YouTube, Facebook, etc) on an average week?
Record the answers from the questions above, then input the data onto the class spreadsheet at:
period 2 class spreadsheet is at http://tinyurl.com/5ur2oc
period 3 class spreadsheet is at http://tinyurl.com/5jc4ee
period 4 class spreadsheet is at http://tinyurl.com/6bbdqy
| # hrs TV/week |
# hrs Internet/week |
# hrs TV/week | # hrs Internet/week | |
Once I give the go ahead in class (when everyone has submitted their data), please do the following. You can do it by hand, using a calculator, or using Excel (if you choose to do this via Excel, you may want to just type/copy/paste this out rather than writing it).
For the following questions, assume a normal distribution.
1. Calculate the mean, median, mode, range and standard deviation for the class data (find each value for both the TV and Internet times).
__
10
2. Assume that the students we polled are representative of the whole school, where the schools population is 500 students.
a) What % will watch less than 5 hours of TV on an average week? How many people is this?
__
2
b) What % will watch between 6 hours and 15 hours of TV on an average week? How many people is this?
__
2
c) What % will watch more than 20 hours of TV on an average week? How many people is this?
__
2
3. Assume that the students we polled are representative of the whole school, where the schools population is 500 students.
a) What % will be on the internet for less than 5 hours on an average week? How many people is this?
__
2
b) What % will be on the internet between 6 hours and 15 hours on an average week? How many people is this?
__
2
c) What % will be on the Internet for more than 20 hours on an average week?
How many people is this?
__
2
4. Zoe watches an average of 10 hours of TV per week. Given the information from the
rest of the school, what would her z-score be?
__
1
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