1. Trend Line: a ___________________ that comes ____________ to the ___________ on a scatter plot. When drawing a trend line, ignore any ____________ (data points that are very different from the rest of the data).
Explorations Workbook Pg 341
Joyce is training for a 10K race. For some of her training runs, she records the distance she ran and how many minutes she ran.
Make a scatter plot of Joyce’s running data (to the right).
To draw a trend line, use a straight edge to draw a line that has about the same number of points above and below it. Ignore any outliers.
Use your trend line to predict how long
it would take Joyce to run 4.5 miles.
How well does your trend line fit the data?
line of best fit
1. The scatter plot represents tips earned (in dollars) and time worked (in hours). Based on a linear model of the data, which is the best prediction for the amount of tips earned in 5 hours of work?
A. $2
B. $15
C. $23
D. $31
close
dots
outliers

2. #26 PreAlg8 Sem2 Practice Exam Version B
The scatter plot shows an individual’s age compared to their sitting height. What do the slope and y-intercept mean?
A. The slope of 60 tells how much the sitting height increases for each 1 year increase in age.
The y-intercept is 50 cm and gives the sitting height when the age is 0 years.
B. The slope of 2.5 tells how much the sitting height increases for each 1 year increase in age.
#25 PreAlg8 Sem2 Practice Exam V:B
The graph shows the number of members that have been in Theatre club and the number of years after the club began.
Based on the trend shown in the data, predict the year after which the club will have no members.
A. 1 year
B. 3 years
C. 6 years
D. 8 years
#37 PreAlg8 Sem2 Practice Exam Version B
Amy buys used books at different garage sales.
Which graph shows the
line of best fit for these data?