Transcript Algebra 1 Bell work - Somerset College Preparatory Academy

Algebra 1 Bell work
Factor
1. 3𝑥 2 − 12
2. 𝑥 2 − 5𝑥 + 6
3. 2𝑥 2 + 24𝑥 + 16
EOY Reminders
1. Dress code still applies
2. My no food policy is enforce
with referrals (it is defiance).
3. Yes, we are still doing math. If
you don’t want to learn, stay
home.
4. You are responsible for your
grade—not me.
Statistics
Sample– some portion of a larger group
Population—an entire group
Biased sample—a sample that favors one
group over another
Unbiased sample—a random sample
Identify as biased or unbiased
1. Every 5th person coming into a grocery store is asked to name a favorite
radio station
2. Every 5th person at the Country Music Showcase is asked to name their
favorite radio station.
3. A journalist visits a senior center and chooses 10 individuals randomly to
poll about various political topics.
4. A shoe company conducts an observational study that involves 10 girls and 2
boys to see which shoes are the most popular
Type
Simple random sample
Definition
A sample that is equally
likely to be chosen as any
other sample from the
population
Stratified random sample The population is first
divided in similar,
nonoverlapping groups. A
random sample is then
selected from each group.
Systematic random sample A sample in which the
items in the sample are
selected according to a
specified time or item
interval
Example
100 student id numbers
are randomly drawn from
a hat, and those students
are given a survey
A candidate surveys
citizens of various groups,
based on their percent of
the population.
Every 10 minutes a toy is
inspected. Or every 50th
toy is inspected
Mean Absolute Deviation
1. Find the mean (mean is the same as average)
2. Find the sum of the absolute values of the
differences between each value in the set of data
and the mean.
3. Divide the sum by the number of values in the set of
data.
Variance—(𝜎 2 )a calculation used to show how
trustworthy the central measures (mean, median, and
mode) are. A high variance means that the central
measures are not a good description of the set of
values.
Standard deviation—(𝜎)another calculation that is
used to show how trustworthy the central measures
are.
Find the variance and standard deviation
Step 1. find the mean.
Step 2. find the variance: square the difference between each number
and the mean. Then sum the squares and divide by the number of
values.
Step 3. find the standard deviation: take the square root of the
variance.