In forming the classes for a frequency distribution and ...

[Hungry!]

In forming the classes for a frequency distribution and histogram, suppose there were a number of empty classes. You should:
 
  A) increase the class width.
  B) decrease the class width.
  C) keep the current class width.
  D) use an ogive instead.

Question 2

In discussing a confidence interval estimate for a population mean, is it acceptable to provide an interpretation like the following: There is a 95 percent chance that  lies in the range 20 to 40?
 
  What will be an ideal response?

[fur]

Answer to Question 1

B

Answer to Question 2

No, this interpretation is not correct. As stated, it implies that  is a random variable that can take on different values when in fact  is a parameter and has a fixed value. The 95 percent confidence level indicates that of all possible confidence intervals constructed from a given size sample selected from the population, and using a z critical value associated with 95 percent confidence, 95 percent of the intervals would contain the true population mean. The particular interval that we actually have computed (20 to 40 ) will either contain  or it won't.

[Hungry!]

Excellent

[FergA]

Wow, this really help