Identifying and Measuring Angles
How many degrees is a straight angle?
180 degrees
What are the three angle relationships we have focused on?
Vertical, Supplementary, Complementary angles
How do you find the mean of a data set?
Add all the values and divide by the number of values
While he was at soccer practice, Tom asked everyone at practice what their favorite brand of cleats was. What type of sample did Tom collect?
A convenience sample
What is everybody going to do for at least 15 minutes tonight at home?
STUDY FOR THEIR MATH TEST
What are supplementary angles?
Angles that add up to 180 degrees
Two angles make up a straight line. One angle is 42 degrees. How many degrees is the other angle?
138 degrees
How do you find the median of a data set?
Line them up from least to greatest and find the middle value.
Jenna sent an email survey to 500 people. 126 people responded. Jenna used that data.
What type of sample did Jenna collect?
A voluntary response sample.
What five values are required to make a box plot?
Min
Max
Q1
Median
Q2
What are complementary angles?
Angles that add up to 90 degrees
Two angles are vertical.
Angle 1 has a measure of 90 degrees.
Angle 2 has a measure of (30 + 3x) degrees.
Set up an equation and solve for x.
x = 20
Find the median of the data set below.
34 12 65 12 17 28 19
19
What is the difference between a cluster sample and a convenience sample?
A cluster sample has folks randomly divided into equal groups and then groups are selected at random.
A convenience sample is taken just from people directly around the person taking the sample.
Solve for x.
2x - 5 + 8x = 6x + 7
x = 3
What is the name of the tool used to measure an angle?
A protractor
Two angles are supplementary.
Angle 1 has a measure of (2x - 4) degrees.
Angle 2 has a measure of 27 degrees.
Set up an equation and solve for x.
x = 78.5
Find the mean of the data set below.
34 12 65 12 17 28 19
26.714
Describe what makes a sample representative of a population?
It is entirely random and includes the features of the whole population.
When looking at a box plot, what percent of the data set can be found between the minimum and the median of a data set?
50%
What symbol signfies a right angle on a diagram?
A square or box in the corner
Two angles are complementary.
Angle 1 has a measure of (x + 5) degrees.
Angle 2 has a measure of (3x + 2) degrees.
Set up an equation and solve for x.
x = 20.75
Which value - the mean or median - is a better representation of the "typical" value in a data set? Why?
A median is a better measure of typical, since it is not skewed by outliers.
John's voluntary response sample said that 64% of people prefer sleeping outside. Can John confidently say that most people prefer sleeping outside? Why or why not?
No. The sample is voluntary response, which is not a representative sample of the population (all people who sleep).
Solve for x.
-12 + 4x = -3x + 2
x = 14