If a sample containing 20 observations is taken from a normally ...

[sheilaspns]

If a sample containing 20 observations is taken from a normally distributed population and a 90 confidence estimate for  is needed, the appropriate t-score is:
 a. 2.12.
  b. 1.746.
  c. 2.131.
  d. 1.729.
  e. 2.602.

Question 2

The security department of a state university is planning its budget for the next year. In estimating the man-hours for security during university sponsored music concerts, the average length of music concerts is needed. A random sample from thirty-six security departments at universities was taken and the sample mean length of concerts was 160 minutes. Suppose the population standard deviation is 45 minutes. A 95 percent confidence interval for the true mean duration of music concerts is:
 a. 157.55 to 162.45.
  b. 147.63 to 172.37.
  c. 71.8 to 248.2.
  d. 145.3 to 174.7.
  e. 160  1.96(45 / 36).

[jxjsniuniu]

Answer to Question 1

D

Answer to Question 2

D

[sheilaspns]

Thank you

[jxjsniuniu]

No problemo