Algebra 1 Bell work. 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.

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Presentation transcript:

Algebra 1 Bell work

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 5 th person coming into a grocery store is asked to name a favorite radio station 2.Every 5 th 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

TypeDefinitionExample Simple random sampleA sample that is equally likely to be chosen as any other sample from the population 100 student id numbers are randomly drawn from a hat, and those students are given a survey Stratified random sampleThe population is first divided in similar, nonoverlapping groups. A random sample is then selected from each group. A candidate surveys citizens of various groups, based on their percent of the population. Systematic random sampleA sample in which the items in the sample are selected according to a specified time or item interval Every 10 minutes a toy is inspected. Or every 50 th 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.

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.