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jprust87 jprust87
wrote...
3 years ago
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).
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preetpatel94preetpatel94
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3 years ago
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