AP Statistics Gathering Data

To test a claim about a mean, when the population standard deviation is unknown we use:

• z procedures

• Pythagorean Theorem

• t procedures

• np > 10 and n(1-p) > 10

Margin of error equals:

• Critical Value ∗ standard Error

• z*

• 1.96

• Standard Error

What do we use to estimate unknown parameters?

• Hypothesis Test

• Confidence Interval

• Trig Identity

• Guess and check

Which method is most likely to produce a random sample of the members of your class? 

• listing the first six students that come to mind 

• choosing the five oldest students in the class

• writing the name of each student on a separate piece of paper and then drawing these slips from a hat 

• selecting the first six students to arrive at class 

Ms. Evans samples her class by selecting every third person on her class list.  Which type of sampling method is this?

• Simple

• Systematic

• Stratified

• Cluster

Dylan asked his school's basketball team to rate the school cafeteria. Is this a biased sample of the school's population?

• Yes, because it is a convenience survey

• No, the basketball team has the smartest students

• Yes, because it's voluntary survey

• No, he should have asked the football team

To study the amount of time students spend doing homework each day, use a random number generator to select 25 freshmen, 25 sophomores, 25 juniors, and 25 seniors to survey.

• Convenience Sample

• Simple Random Sample

• Stratified Random Sample

• Interval Sample

1000 surveys from ESPN are mailed but only 150 are returned. Most of the returned surveys said they hated football.

• This is an example of undercoverage bias.

• This is an example of voluntary response bias.

• This sample could have both voluntary response and non-response bias.

• This is good data, most people really hate football. 

The student newspaper runs a weekly question that readers can answer online or by campus mail. One question was “Do you think the college is doing enough to provide student parking?" Of the 136 people who responded, 79% said “No." The newspaper poll does not give a trustworthy estimate of student opinion because there is

• bias due to nonresponse.

• bias due to undercoverage.

• bias due to the suggestive wording of the question.

• bias due to relying on voluntary response.

Ms. Reynolds samples her class by selecting all students sitting at group 1 and group 5 in her classroom.  This sampling technique is called?

• Simple

• Stratified

• Systematic

• Cluster