SOLUTION: A random sample of 61 Basic Statistics students were asked what they thought of statistics on a scale of 0 (very stupid) to 100 (very nice). Interestingly, students seem to find st

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Question 1132661: A random sample of 61 Basic Statistics students were asked what they thought of statistics on a scale of 0 (very stupid) to 100 (very nice). Interestingly, students seem to find statistics quite nice: the sample mean equals 83. The sample standard deviation equals 7. We know that the standard deviation in the population (all BS students) is 8. Calculate the 90% confidence interval.
Answer by stanbon(75887) About Me  (Show Source):
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A random sample of 61 Basic Statistics students were asked what they thought of statistics on a scale of 0 (very stupid) to 100 (very nice). Interestingly, students seem to find statistics quite nice: the sample mean equals 83. The sample standard deviation equals 7. We know that the standard deviation in the population (all BS students) is 8. Calculate the 90% confidence interval.
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mean = 83
std = 8
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For 90% CI, z = +/- 1.645
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Lower Limit:: 83 - 1.645*8 = 69.84
Upper Limit:: 83 + 1.645*8 = 96.16
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Cheers,
Stan H.
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