SP 1

9/18 Virtual SP1 and SP2 Review

MGSE6.SP.1/ MGSE67.SP.1 will recognize statistical questions and understand that statistics can be used to gain information about a population by examining a sample of the population.

MGSE7.SP.2 Use data from a random sample to draw inferences about a population.

Have you ever thought how award shows choose the winners for best song/new artist?

Class Discussion-Pre video

Poll

Did you learn anything???

• Yes

• No

Whole Group Practice

Help me determine whether the questions are statistical... or not.

Multiple Select

Which of the following questions are statistical questions?

• What is the favorite menu item for customers in the local restaurant.

• What time do most people eat their lunches?

• What did my dad eat for lunch today?

• What do 7th graders prefer to eat for lunch?

• What was the high temperature in Mexico City today?

Poll

100 7th graders were ask the following questions. Which question responses will yield the most variability?

• What is your favorite flavor skittle?

• What is your favorite sport?

• What is your favorite food?

• Do you like cats or dogs?

Multiple Choice

Which question is a statistics question that anticipates variability?

• Does my father like a Mazda more than a Lexus?

• What is my brother's favorite type of car to drive?

• What type of car do the seniors in high school prefer to drive?

• If I wanted to buy a car with the lowest insurance rate which one would it be?

Multiple Choice

Which describes a statistic of a sample?

• all the women in the world

• all registered voters in Texas

• all men who played golf at least once in the past year

• 58% of US residents agree with the health care proposal

Multiple Choice

A mayor wants to determine if the people in his city think that he is doing a good job.

Which choice BEST represents the population?

• Voters age 21 to 35.

• All the local business owners.

• The people who voted for him.

• All the residents of the city.

Multiple Choice

A librarian is interested in the numbers of books that visitors check out from the library. She examines the checkout records of 250 randomly selected adult visitors.

Identify the population and sample for this situation.

• The population is all visitors of the library; the sample is the adult visitors of the library.

• The population is all adult visitors of the library; the sample is the 250 visitors selected.

• The population is all visitors who check out at least 1 book from the library; the sample is the 250 visitors selected.

• The population is the 250 visitors selected; the sample is the 250 visitors who check out at least 1 book from the library.

Multiple Select

Which is a quantitative variable?

• eye color

• categories of plants

• population of a city

• status of a job application

Multiple Select

Which is a qualitative variable?

• gallons of water in pool

• cups of coffee served

• breeds of dogs

• weight of recycled cans

Multiple Choice

Which is an example of discrete data?

• amount of time required to drive to work

• square footage of a house

• height of a pepper plant

• number of days in a month

Multiple Choice

Which is an example of continuous data?

• numbers on the face of a clock

• number of peers on a jury

• time it takes to shower

• number of characters in a play

Sampling Methods...important vocabulary

• Biased: unfairly prejudiced for or against someone or something."we will not tolerate this biased media coverage"

• Convenience sample: The researcher chooses a sample that is readily available in some non-random way.

  Example—A researcher polls people as they walk by on the street.

  
  

  Why it's probably biased: The location and time of day and other factors may produce a biased sample of people..

  
  

• Voluntary response sample: The researcher puts out a request for members of a population to join the sample, and people decide whether or not to be in the sample.

  Example—A TV show host asks his viewers to visit his website and respond to an online poll.

  
  

  Why it's probably biased: People who take the time to respond tend to have similarly strong opinions compared to the rest of the population.

Multiple Select

Select all that you think are biased (fair)...

• All the girls get candy.

• All the athletes do not have to do their homework

• Every fifth student in the door gets a prize.

• Mrs. A chooses your name out of the bucket to answer the next question?

Multiple Choice

A politician wants to see what people in her district think about tax cuts. Which procedure would be a good way of conducting a survey?

• Answer listeners' calls on a morning radio program.

• Invite the public to a meeting held on a Wednesday at 10:00 AM.

• Conduct a clipboard survey of people entering and leaving a mall.

• Mail a questionnaire to randomly selected households in her district.

Multiple Choice

At the end of the city's annual marathon, each participant completed a questionnaire. The marathon's planner randomly chose 30 of the surveys to review. Which statement BEST describes the random sample?

• The 30 surveys are likely to be representative of all the runners in the marathon.

• The 30 surveys are likely to be representative of all who came to watch the marathon.

• The 30 surveys are not likely to be representative of all the runners in the marathon.

• The 30 surveys are likely to be representative of only the runners placed in the marathon.