Project #6370 - statistcis

 

The personnel director of a large corporation wants to study absenteeism among

 

      clerical workers at the corporation’s central office during the year. A random

 

      sample of 25 clerical workers reveals the following:

 

 

 

Ø  Absenteeism: = 9.7 days, S = 4.0 days.

 

                   12 clerical workers were absent more than 10 days.

 

 

 

 

 

 

  1. Set up a 95% confidence interval estimate of the population proportion of clerical workers absent more than 10 days last year.

 

 

 

 

A manufacturer of power tools claims that the average amount of time required to

 

       assemble their top-of-the-line table saw is 90 minutes with a standard deviation of 40

 

       minutes.  Suppose a random sample of 64 purchasers of this table saw is taken. Find the 

 

       probability that the sample mean will be greater than 98 minutes?

 

 

 

b) Given that X is a normally distributed random variable with a mean of 60 and a

 

 standard deviation of 4, find the probability that X is between 57 and 64.

 

 

 

(show working)

 

Subject Mathematics
Due By (Pacific Time) 05/18/2013 10:00 am
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