The manager of a computer help desk operation has collected enough data to conclude that the ...

The manager of a computer help desk operation has collected enough data to conclude that the distribution of time per call is normally distributed
 
  with a mean equal to 8.21 minutes and a standard deviation of 2.14 minutes. Based on this, what is the probability that a call will last longer than 13 minutes?
  A) About 0.0125
  B) Approximately 0.4875
  C) About 0.5125
  D) About 0.9875

Q. 2

The Holt-Winters multiplicative model is based on the equation ________.
 
  A) Ft + 1 = at (bt + St - s  2 )
  B) Ft + 1 = at (bt + St - s + 1 )
  C) Ft + 1 = (at + bt) St - s + 1
  D) Ft + 1 = (at + bt -1 ) St - 2

Q. 3

A 95 percent confidence interval estimate will have a margin of error that is approximately 95 percent of the size of the population mean.
 
  Indicate whether the statement is true or false

Q. 4

In estimating a confidence interval for the difference between two means, when the samples are independent and the standard deviations are unknown, it can be acceptable for there to be small violations of the assumptions of normality and equal
 
  variances, especially when the sample sizes are equal. Indicate whether the statement is true or false

Q. 5

If the age distribution of customers at a major retail chain is thought to be bell-shaped with a mean equal to 43 years and a standard deviation equal to 7 years, the percentage of customers between the ages of 29 and 57 years is:
 
  A) approximately 81.5.
  B) approximately 68.
  C) at least 75.
  D) approximately 95.

Q. 6

What is a slack? Explain with an example.
 
  What will be an ideal response?