Answers to Friday's Quiz

D-5:

A)  For essentially correct you needed three things:

• Randomly assign the treatment to
  
• two treatment groups (new drug and old drug)
• and compare the chltr. at the end

B)  Two things:

• Blocking LINKED to cholesterol level
• Randomly assign treatment

C)  Yes:  neither the PATIENT nor the DOCTOR knows who's getting which drug.  (only one guy with the secret code).


J-1:

A)  Boxplots must have labels and you should have figured out that their are two low outliers and one high outlier for graph A.

Bi)  To make the proportion sound best, chose A.  With A, over 75% of the cars improved, whereas with B only 50% improved.  Note:  must compare to B for full credit.

Bii)  To pick the highest mean, pick B.  B has a lot of higher values than A.  A has low outliers which will pull it down.  The top 25% of B is from 25 to 40, which is above A's max.

Email me if you have any questions this weekend!  (mrmathman@gmail.com)