1. Complete the 2 way table and answer the questions showing all work.
A swim club has 112 members. Fifty-seven of these members are boys. Thirty of the members are girls who are under the age of 18 and 35 of the members are boys who are over the age of 18.
Complete the table:
Under 18
18 or older
Total
Boys
Girls
Total
How many members of the swim club are girls 18 or older?
What is the relative frequency of members who are girls
and 18 or older?
2. Match the graph with the Scenario and with the
table.
Graph
Scenario
G
H
I
J
Scenario 1: Tom went for a walk with friends. He realized he forgot his wallet. He ran home and then had to run to catch up with the others.
Scenario 2: Tom ran from his home to the bus stop and waited. He realized he had missed the bus, so he walked home.
Scenario 3: This graph is just plain wrong! How can Tom be in 2 places at the same time?
Scenario 4: Tom was at a school event. When it was over, he walked steadily home.
Linear Regression Model Portfolio
Scatter Plot Data
Step 1
Work with a partner and a timer (phone timer) to take measurements and test your conjecture. One of you will be the timer and the other will count their own number of heartbeats per period of time.
Step 2
Is there a relationship between the two quantities? Do you think that the number of heartbeats is proportional to the number of seconds?
Show the heartbeats/seconds for each # of seconds to see if it is consistent for you and for you and your partner.
How many times would you expect your heart to beat in 25 seconds? ____________ 60 seconds? _____________ 120 seconds? ___________
Show your work here:
Step 3
Plot the points that you found in the table on the graph below making a scatter plot of the 3 points for you…and one scatter plot for your partner.
Step 4
Draw a line of best fit for your heart rate scatter plot using a ruler.
Draw a line of best fit for your partner’s heart rate scatter plot using a ruler.
Is there a correlation or pattern (as one increases, the other increases; or as one increases, the other decreases)? _________________
Is it a positive correlation or a negative correlation? __________________
Is it a strong correlation or a weak correlation? ___________________
Step 5
Write the equation of the line of best fit for your heart rate.
Y = mx + b Where m is the slope = rise/run and b is the y-intercept.
y = ______ x + _______