Statistics Detective Review Lab
Recall that an underlined phrase means that it is a link off of the
web page itself. The lab can be accessed from
tomorrow's due date on the main web page.
Take our your mean, median and mode lab in addition to your
regression lab.
Use the
clues below and effective reasoning skills in order
to identify the "odd person out" in our
class data set.
To mark off eliminated people on the computer, be sure that
View/Toolbar/Formatting is checked. Use the fill-in feature
to eliminate suspects by
clicking on the row number
(in grey) and then the paint can
in the formatting toolbar. You may change fill-in colors by clicking on
the arrowhead just to the right of the paint can.
The suspect...
- satisfies the statement "did improve their MRT score"
Describe the combinations of scores of the
people that can be eliminated
(the people who contradict the statement).
How many people can you
eliminate?
- does not hit the 1st quartile (q1)
"on the head" for the number of competitors of
the family bathroom. The general command for the 1st quartile in the
sth column is =quartile(s2:s23,1). Do not re-order the column - Excel
doesn't need that for the command to work.
Which column does the clue apply to?
What is q1?
Describe the kinds of numbers that can be eliminated.
How many additional suspects can you eliminate?
How many total people have now been eliminated?
- falls within the middle 50% of the class on
the boxplot of the
distance from home
Sketch the boxplot here (you should have this in class notes -
use our by-hand work).
Describe the kinds of distances that can be eliminated.
How many additional suspects can you eliminate?
How many total people have now been eliminated?
- has a golden mean of (1+sqrt(5))/2 embedded in the
forearm to hand
ratio within a 0.1 decimal range.
Compute the golden mean in decimal form and write it down
here.
Describe the kinds of numbers that can be eliminated.
In Excel, compute the forearm to hand ratios of the remaining
suspects (in the second row of
an empty column, type =G2/F2 and hit return.
Then, go back up to that box, go to the bottom
right until you see the symbol that resembles a square with
arrowheads on the top left and bottom right corners,
click, and pull the mouse down to fill down the column (as we did in
the golden mean lab).
Now use the clue to eliminate people.
How many additional suspects have been eliminated?
How many total people have now been eliminated?
- helps the statistics that show that, on average,
women perform more poorly than
men on the timed test.
What is the female timed test average?
What is the male timed test average?
Describe the scores of the men that can be eliminated.
How many additional men were you able to eliminate?
Describe the scores of the women that can be eliminated.
How many additional women were you able to eliminate?
How many total people have now been eliminated?
- helps the statistics that say that people
are better able to remember real words than nonsense words.
How many additional suspects have been eliminated?
- pulls
the original regression line for "does armspan predict height" down
since the actual height value corresponding to the actual armspan is
below the predicted value for the actual armspan given by plugging into
the equation of the best fit line.
What is the equation of the best fit line (use the one from
your last lab with the problem point removed)?
Compute the predicted value for the actual armspan for
your suspect and show work to give evidence that your suspect does
indeed satisfy this clue.
Your Suspect
Once you have your guess, call me over and show it to me, and have
your suspect approved.
Gender______
Armspan______
Height______
Foot Length______
Head Circ______
Hand______
Forearm______
Class Yr_________________
Siblings______
Home_______
Major_______________________
Minute______
RealWds______
NonsenseWds______
Timed MRT______
Untimed MRT______
Next work on Homer's taxes.