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September 20, 2014

September 20, 2014

Posted by **Angela** on Saturday, May 5, 2012 at 8:19pm.

90, 72, 75, 60, 75, 72, 84, 72, 88, 74, 105, 115, 68, 74, 80, 64, 414, 82, 48, 58, 60, 80, 48, 58, and 108.

Consider the average available. Identify the point estimate of the average number of available hotel rooms in this lesson from each sample. Construct and Interpret a 95% confidence level for the true mean number of available hotel rooms, based on the point estimate of each sample. Describe how the confidence intervals will change depending on whether the population standard deviation is known or unknown.

- Statistics -
**PsyDAG**, Sunday, May 6, 2012 at 3:52amFind the mean first = sum of scores/number of scores

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation (SD) = square root of variance

95% = mean ± 1.96 SEm

SEm = SD/√n

I'll let you do the calculations.

From the equations above, you cannot estimate the confidence levels, if the SD is unknown.

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