Lab assignment 7 (due Friday, March 31)

*** SLBD stands for the book "Statistics: Learning by Doing."  ***

*** SAWA stands for "Short Answer Writing Assignment"  ***

Please read lab session 7 (pages 94-102 of SLBD) BEFORE coming to class
on Monday.

I.  Answer SAWA questions 1 through 4 (in complete sentences where applicable).

II.  Compute, and interpret, a 95% (classical) confidence interval for p, where p 
is the proportion of the population that prefers the bargain product. 
(NOTE: Do this for each type of product, except for the Nilla Wafers.)


III.  In many clinical trials to determine the effectiveness of a new drug, 
patients are randomly assigned to receive the treatment (the new drug) or the 
control (a placebo, which is a fake pill that has no physical medical effect).  
Patients are not told whether they are receiving the drug or the placebo, and this 
aspect makes the experiment single-blind.  Explain why, in this situation, it is 
usually preferred that the experiment be "double-blind", that is, the doctor who 
actually gives out the drugs shouldn't know which patients are assigned to which 
group.