A ____ study is designed to test a new drug or treatment in a ...

[eruditmonkey@yahoo.com]

A ____ study is designed to test a new drug or treatment in a small group of people to evaluate its safety, determine a safe dosage range, and identify potential side effects.
 
  a. pilot
 b. Phase I
 c. Phase II
 d. Phase III

Question 2

How does a t test differ from a z test in terms of when it is used, how it is calculated, and how we determine significance?
 
  What will be an ideal response?

[blakcmamba]

Answer to Question 1

b

Answer to Question 2

A t test differs from a z test in that s is not needed to make the calculations and the sample size should be smaller (30 or lower), whereas for a z test s is known and the samples are 30 or greater. The calculations are similar except that with a t test they are based on using s (the estimated standard deviation) rather than s. The z test has set critical values to determine significance and the critical values for the t test vary based on sample size.