Confidence Intervals

a) Define\Describe the purpose of constructing confidence intervals( in 1-2 full sentences - for full credit )

and b) Briefly list two sample point estimates used to construct confidence intervals.

The standard deviation of the volumes of blood draws in purple-top tubes is known to be approximately 4 milliliters ( mls ). Later, in problem # 4 , we will wish to construct a 95% confidence interval for the mean volume of blood draws in purple top tubes. The volumes of 75 blood draws in purple-top tubes are determined. The sample mean volume is 6 ml. The sample standard deviation is 2.5 ml.

Identify the following:

a. x(with line over it)= _____

b. = _____

c. n = _____

Determine the correct distribution for problem # 2 ( above ) in the format of:x(with line over it) ~ ?(?,?)

( that is, fill in the 3 question marks above with the appropriate terms )