A random sample of 64 students at a university showed an average
age of 20 years...
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Statistics
A random sample of 64 students at a university showed an averageage of 20 years and a sample standard deviation of 4 years. The 90%confidence interval for the true average age of all students in theuniversity is
19.50 to 20.50
19.36 to 20.38
19.18 to 20.49
19.02 to 20.59 Â Â Â Â Â Â Â Â Â Â Â
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Solution Given thatPoint estimate sample mean 20sample
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