Influence & Leverage
Linear Models & Re-expression
Random Category
Just a Sampling
Word Power!
100
The outlier in this diagram has this (leverage/influence/both/neither).
What are leverage and influence?
100
Re-expression is used in order to do this.
What is straighten nonlinear data?
100
A system in which each individual is given an equal, random chance of selection is called this.
What is randomization?
100
We want to conduct a survey of families of local high school students to determine how they feel about the new high school graduation policy. We want a sample size of 100. We take the high school directory, number each family, and select 100 at random using a random number table. This is an example of a ___ sampling technique.
What is simple random sample?
100
A sample that consists of the entire population.
What is a census?
200
The blue point has this (influence/leverage/both/neither).
What is influence?
200
Three types of re-expression are these.
What are square root, logarithmic, reciprocal, square, or negative of any of the above?
200
We want to know what percentage of local businesses will extend their hours during the holiday season. We take a page out of the phone book and call every business on that page. Tell whether this is an appropriate sampling method and why or why not.
What is no, this will result in undercoverage bias because only one or two types of businesses will be listed on that page?
200
We want to conduct a survey of families of local high school students to determine how they feel about the new high school graduation policy. We want a sample size of 100. We take the high school directory, select four pages at random, and call each family on those pages. This is an example of a ___ sampling technique.
What is cluster?
200
The entire group of individuals or instances about whom we hope to learn.
What is the population?
300
The point labeled "dc" has this (influence/leverage/both/neither).
What is leverage?
300
Tell whether re-expression should be tried, and why or why not.
What is yes, because the residuals plot is curved?
300
We want to know what percentage of local businesses will extend their hours during the holiday season. We will select 50 businesses at random from those that advertise on a certain website. Tell whether this is an appropriate sampling method and why or why not.
What is no, this will result in undercoverage of the businesses that didn't purchase an ad on the website?
300
We want to conduct a survey of families of local high school students to determine how they feel about the new high school graduation policy. We want a sample size of 100. We take the high school directory, number each family, select a starting place at random, and then choose every 25th family. This is an example of a ___ sampling technique.
What is systematic?
300
Any systematic failure of a sampling method to represent its population.
What is bias?
400
The outlier in this scatterplot has this (influence/leverage/both/neither).
What is both?
400
Tell whether re-expression should be used, and why or why not.
What is no, because there is random scatter?
400
A certain Statistics teacher wants to select three of her 27 students at random to receive a special prize. She numbers the students from 01 to 27 and then uses a random number table to determine who gets the prize. Using the following random numbers, these are the numbers of the students who will receive the prize: 35020 28926 17029 45671
Who are students 2 (02), 26, and 17?
400
We want to conduct a survey of families of local high school students to determine how they feel about the new high school graduation policy. We want a sample size of 100. We stand outside after the monthly board meeting and talk to families as they leave. This is an example of a ___ sampling technique.
What is convenience?
400
Anything in a survey design that influences responses.
What is response bias?
500
The difference between influence and leverage.
What is influence changes the slope of the regression line, whereas leverage means the point is far from the mean of the x-values?
500
A linear model is appropriate for a set of data when this occurs.
What is random scatter in the residuals plot?
500
Modeling a real-world situation by using random-digit outcomes to mimic the uncertainty of a response variable of interest is called this.
What is a simulation?
500
We want to conduct a survey of families of local high school students to determine how they feel about the new high school graduation policy. We want a sample size of 100. We take the high school directory, divide families into groups by grade level of the students, and then select 25 families at random of each grade level. This is an example of a ___ sampling technique.
What is stratified?
500
A small trial run of a survey to check whether questions are clear.
What is a pilot?