IDS 270 EVALUATION TEST QUESTIONS AND
ANSWERS SURE A+
✔✔What is a skyscraper? - ✔✔All data in one category
✔✔What is a pancake? - ✔✔Too many categories = not a lot of data
✔✔What does it mean to minimize chart ink? - ✔✔Cleaning up the chart
✔✔What are some techniques to cleaning up chart ink? - ✔✔Taking away things like:
Redundant legends, unnecessary lines and borders, etc.
✔✔Define Non-Response bias - ✔✔Someone is selected for a sample and they do not
respond.
✔✔Define convenience sample - ✔✔Sampling those who are convenient to reach. ex
mall intercepts, or asking the people on the floor of your dorm to fill out a survey
✔✔Define response bias - ✔✔Not answering truthfully to sensitive questions/topics. Ex
how much pot do you smoke
✔✔(T/F) Bigger standard deviation, bigger spread - ✔✔True
✔✔Define voluntary response sample - ✔✔Voluntarily giving data to a study. Ex people
text to a phone number of they agree with a statement and text to a different one of they
disagree
✔✔Why could there be a difference between two departments? (3) - ✔✔Outliers, right-
skewed charts, lurking variables
✔✔When and only when can you compare the means of two charts? - ✔✔If they are
symmetric
, ✔✔Define Simpson's Paradox - ✔✔When aggregate data shows one result, but when
you look at the details, you find a different result
✔✔When finding a regression line, what is the formula for finding the slope? what is the
formula for finding the y intercept? - ✔✔slope = (sy/sx) * r
then
y intercept = ybar-slope * xbar
yhat= yintercept +slope
✔✔What is the regression equation actually equal to? - ✔✔yhat
✔✔If the x variable is increased by 1, what happens to y? - ✔✔The variable changes by
the amount of the slope
✔✔Variance formula - ✔✔r^2
✔✔How can you describe the strength of a regression relationship? - ✔✔The amount of
variance. The closer to 100%, the better the relationship
✔✔Define Bias - ✔✔Bias occurs when the center of the sampling distribution is not the
same as the center of the population distribution
✔✔How do you combat bias? - ✔✔Simple random sampling
✔✔How do you combat variability? - ✔✔Larger sample
✔✔For one variable at a time, what types of graphs/tables are categorical? (3) - ✔✔Bar
chart, Pareto Chart, Pie Chart
✔✔For one variable at a time, what types of numbers/computations are categorical? -
✔✔None
✔✔For one variable at a time, what types of graphs/tables are quantitative? (3) -
✔✔Histogram, Box plot, Stem & Leaf plot
✔✔For one variable at a time, what types of numbers/computations are quantitative? (2)
- ✔✔Measure of center, measures of spread
✔✔For two variables at a time, what types of graphs/tables are categorical?
What chapter does this relate to? - ✔✔Two way table and their graphs?
ANSWERS SURE A+
✔✔What is a skyscraper? - ✔✔All data in one category
✔✔What is a pancake? - ✔✔Too many categories = not a lot of data
✔✔What does it mean to minimize chart ink? - ✔✔Cleaning up the chart
✔✔What are some techniques to cleaning up chart ink? - ✔✔Taking away things like:
Redundant legends, unnecessary lines and borders, etc.
✔✔Define Non-Response bias - ✔✔Someone is selected for a sample and they do not
respond.
✔✔Define convenience sample - ✔✔Sampling those who are convenient to reach. ex
mall intercepts, or asking the people on the floor of your dorm to fill out a survey
✔✔Define response bias - ✔✔Not answering truthfully to sensitive questions/topics. Ex
how much pot do you smoke
✔✔(T/F) Bigger standard deviation, bigger spread - ✔✔True
✔✔Define voluntary response sample - ✔✔Voluntarily giving data to a study. Ex people
text to a phone number of they agree with a statement and text to a different one of they
disagree
✔✔Why could there be a difference between two departments? (3) - ✔✔Outliers, right-
skewed charts, lurking variables
✔✔When and only when can you compare the means of two charts? - ✔✔If they are
symmetric
, ✔✔Define Simpson's Paradox - ✔✔When aggregate data shows one result, but when
you look at the details, you find a different result
✔✔When finding a regression line, what is the formula for finding the slope? what is the
formula for finding the y intercept? - ✔✔slope = (sy/sx) * r
then
y intercept = ybar-slope * xbar
yhat= yintercept +slope
✔✔What is the regression equation actually equal to? - ✔✔yhat
✔✔If the x variable is increased by 1, what happens to y? - ✔✔The variable changes by
the amount of the slope
✔✔Variance formula - ✔✔r^2
✔✔How can you describe the strength of a regression relationship? - ✔✔The amount of
variance. The closer to 100%, the better the relationship
✔✔Define Bias - ✔✔Bias occurs when the center of the sampling distribution is not the
same as the center of the population distribution
✔✔How do you combat bias? - ✔✔Simple random sampling
✔✔How do you combat variability? - ✔✔Larger sample
✔✔For one variable at a time, what types of graphs/tables are categorical? (3) - ✔✔Bar
chart, Pareto Chart, Pie Chart
✔✔For one variable at a time, what types of numbers/computations are categorical? -
✔✔None
✔✔For one variable at a time, what types of graphs/tables are quantitative? (3) -
✔✔Histogram, Box plot, Stem & Leaf plot
✔✔For one variable at a time, what types of numbers/computations are quantitative? (2)
- ✔✔Measure of center, measures of spread
✔✔For two variables at a time, what types of graphs/tables are categorical?
What chapter does this relate to? - ✔✔Two way table and their graphs?
