The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 18. A random sample of 310 salespeople was taken and the mean number of cars sold annually was found to be 71. Find the 94% confidence interval estimate of the population mean.

asked by lupita

12 years ago

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1 answer

94% = mean ± 1.88 SEm

SEm = SD/√n

answered by PsyDAG

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Question

The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 18. A random sample of 310 salespeople was taken and the mean number of cars sold annually was found to be 71. Find the 94% confidence interval estimate of the population mean.

1 answer

94% = mean ± 1.88 SEm

SEm = SD/√n

PsyDAG · Answer

94% = mean ± 1.88 SEm SEm = SD/√n