If a continuous random variable is said to be exponentially ...

[tichca]

If a continuous random variable is said to be exponentially distributed, what would be the easiest way to reduce the standard deviation?
 
  What will be an ideal response?

Question 2

In a situation where the population standard deviation is known and we wish to estimate the population mean with 90 percent confidence, what is the appropriate critical value to use?
 
  A) z = 1.96
  B) z = 2.33
  C) z = 1.645
  D) Can't be determined without knowing the degrees of freedom.

[katkat_flores]

Answer to Question 1

The standard deviation of an exponential distribution is equal to the mean (1/) so the easiest way to reduce the standard deviation is to reduce the mean. This would be done by increasing .

Answer to Question 2

C