A simple random sample of size 20 has mean $\bar { x } = 70.89$ and standard deviation s = 16.77. The population distribution is unknown. Determine the correct method of finding a 90% confidence Interval for the population mean and compute it.
A) Cannot compute: the population size is too small.
B) z-method: (64.72, 77.06)
C) t-method: (64.41, 77.37)
D) z-method: (64.41, 77.37)

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The Answer of A simple random sample of size 20 has mean $\bar { x } = 70.89$ and standard deviation s = 16.77. The population distribution is unknown. Determine the correct method of finding a 90% confidence Interval for the population mean and compute it.
A) Cannot compute: the population size is too small.
B) z-method: (64.72, 77.06)
C) t-method: (64.41, 77.37)
D) z-method: (64.41, 77.37)

A Simple Random Sample of Size 20 Has Mean xˉ=70.89\bar { x } = 70.89xˉ=70.89

A Simple Random Sample of Size 20 Has Mean $\bar { x } = 70.89$