Transcript Example of survey

The Pulse Rate Survey
We Survey Ourselves
Learning More About Surveys
The Question
• Statistical surveys usually
begin with a general question
we want an answer for.
• Here’s our question:
– Is there a difference between the male and female
resting pulse rate of WHS students?
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We survey ourselves
How do we obtain the data?
• We examine the Intro Stats students
• We need calm & silence in the room
• Hold the fingers of one hand on the artery in
your neck or on the inside of the wrist to get a
heart beat so you can measure your pulse.
• Count the number of beats you feel in 30
seconds. Teacher will do the timing. Multiply by
2 to get BPM (beats per minute). Record.
• Do this 2 times. Average the 2 counts for an
average pulse rate.
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Now for the Data Collection
• Report your numbers for recording on the
overhead and on your classwork
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What do we need to do? Next step
• Record everyone’s results, separating
male and female results.
• Now we need a class average by gender
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Averaging Using The TI Calculator
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Turn on the calculator—ON at the bottom left
Hit the STAT key (column 3 row 2)
Go to #1 EDIT. Hit ENTER.
If L1 (list one) is not clear, clear it by going to the
top of the list, highlighting the L1 column by
using the ARROW UP key.
• Hit CLEAR and ENTER buttons to clear L1 List
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Averaging Using the TI Calculator
• Go to the first entry for L1
• Enter each piece of data for Males
followed by the ENTER key, making a
separate entry for each piece of data
• Go to the first entry for L2 and then enter
each piece of Female data
• When finished, return to the main screen
by hitting 2nd MODE (row 1 column 1 then
row 1 column 2)
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Averaging using the TI Calculator
• Hit 2nd STAT (row 1 col 1; row 2 col 3)
• RIGHT ARROW key to highlight the word
MATH
• ARROW DOWN to #3 MEAN. Hit ENTER
• Mean ( appears on the home screen.
• Hit 2nd and the number 1. Mean(L1
appears on your home screen
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Averaging Using the TI Calculator
• Hit ENTER. The mean of your list in L1 is
calculated and appears on the home screen.
• Hit 2nd STAT. Right arrow to math. Arrow down
to #3 MEAN. Hit ENTER.
• Hit 2nd and the number 2. The Mean(L2 appears
on your home screen
• Hit ENTER. The mean of your list in L2 is
calculated and appears on the home screen.
• Hurray! you’ve succeeded in using your TI for the
first time to find a Mean for Males and Females
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Back to the Pulse Rate Survey
• We have averaged the averages for each
gender
• Record the average for each gender at the
bottom of CW 102.
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Calculate Spread & Range
• Spread—the minimum and maximum for
any sample
• Range—the distance between the
minimum and maximum of a sample.
• Record the spread and range for the male
& female samples using the following
instructions:
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Finding Spread for Data Using TI
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Calculator is ON
Your data is already in L1
Hit the STAT key
ARROW DOWN to highlight #2 SORTA(
Hit ENTER
After Sort A( hit the 2nd key followed by the
number 1. The symbol L1 appears
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Finding Spread for Data Using TI
• Hit ENTER
• The word “done” appears on the screen
• Go back to your list by hitting STAT key
followed by 1 EDIT
• Look at List One (L1). It is now sorted from
lowest number to highest
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Finding Spread for Data Using TI
• Choose the first number on your list for the lower
number in the Spread and the last number on
the list for the higher number in your Spread
• Record those numbers on your CW
• Hurray! You’ve learned to SORT data and use it
to record a Spread
• On your home screen subtract the first number
from the last number to obtain the range.
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Homework
• Use the data you’ve recorded for your
reference
• Answer the ‘usual’ questions about the
nature of this survey using the data and
your powers of analysis.
• End of the Pulse Survey Presentation
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