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Home Q & A Board Science-Related Homework Help Mathematics Statistics and Probability
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jprust87 jprust87
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6 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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smdavis
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6 years ago
Thanks for your help!!
sweetalia
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Yesterday
Just got PERFECT on my quiz
loki1345
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2 hours ago
This helped my grade so much Perfect
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