Data and Bias

Poll

Do you know about cheerleading?

• Yes

• No

Poll

I do not think cheerleading should be considered a sport.

• True

• False

Poll

I believe that cheerleading should be a sport and that track should not be.

• Strongly Agree

• Somewhat Agree

• Neutral

• Somewhat Disagree

• Strongly Disagree

Poll

How unjust do you believe it is that cheerleading is not a high school sport?

• Very

• Somewhat

• A little

• Not at all

Poll

How much do you agree with the statement: Cheerleading is harder than football.

• Strongly Agree

• Somewhat Agree

• Neutral

Poll

Sports should be part of high school

• Strongly Agree

• Somewhat Agree

• Neutral

• Somewhat Disagree

• Strongly Disagree

Poll

Sports should require teams and games with win/loss/tie outcomes.

• Strongly Agree

• Somewhat Agree

• Neutral

• Somewhat Disagree

• Strongly Disagree

Discuss at your tables...

• Are the questions in my survey "good"?

• Will my survey give useful information?

• Would my results be vastly different if I gave it to another group? For example, teachers, grandparents, patrons at a violin store?

A high school principal wants to determine how much time per day his school's students spend using screens (computers, tablets, TV, etc). For the poll, the principal talks to students who are staying after for track.

 

Before the 2010 elections for members of the US House of Reps, pollsters called American households on their landlines to see how they planned to vote. What kind of sample bias might have affected the poll?

 

A teacher wants to tell his students how the average student did on his exam, so he looks at the grades in his gradebook. Two students scored 0 because they were absent.

 

He uses the mean, 71, as the measure of center. Does the mean accurately represent the data? Should he use the mode or median instead?

A publisher is going to release a paperback edition of one of its books and wants to include positive press. They look at the reviews and decide to use the mode to claim that the book "received an average of 4 stars" in its reviews.

 

Is this the most accurate measure of center?

Which graph suggests that the business is extremely profitable?

 

The line graphs show a company's monthly profits.

​Is this a valid conclusion? Explain.

Multiple Choice

Type of Data arrangement

• Symmetrical

• Hairline

• Skewed Positive

• Skewed Negative

Multiple Choice

Shape?

• Skewed right

• Skewed left

• Symmetric

• Unimodal

Multiple Choice

What is the shape of the distribution?

• Symmetrical

• Uniform

• Skewed Right

• Skewed Left

Multiple Choice

What is the shape of the distribution?

• Skewed Left

• Skewed Right

• Symmetric

• Uniform

Multiple Choice

What is the shape of the distribution?

• Skewed Left

• Skewed Right

• Symmetric

• Uniform