A college admission director wishes to estimate the population mean age of all students currently enrolled ...

  

l. Assume cholesterol levels are  normally distributed. The Chief Statistician for the Center  for Disease Control  takes a random  sample of six females (ages 21-35) and obtains the following results:  189, 177, 188, 195, 183 and 179.  All work must be shown.  (10pts)

Please compute the following statistical indicators: 

Arithmetic Mean:  _

Median:   _ Mode:  _ Range:  _ Variance:  _

Standard Deviation:  _

Set up a normal distribution model plus and minus three "z" values, showing the cholesterol levels of females (ages21-35).

  

2. A college admission  director wishes to estimate  the population  mean  age of all students currently enrolled.  He takes a random sample of 57 students, the mean age is found to be 22.95 years.  From  past studies, the population  standard deviation is known to be 5.55 years.  Construct an eighty-five percent  confidence interval  of the population mean age.  Assume  the  standard  deviation  is  known;  use  "z" procedure).  (5 points)