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The Standard Error Of The Mean, The Z Value And The Interval Half Width

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Can you help me put this on excel? I tried several times but I don't think I'm doing something right.

If we knew the confidence level was 90%, the sample mean was 3, the sample size was 30 and the population standard deviation was 1.5, we could use this to find the standard error of the mean, the z value and the interval half width.

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Solution Summary

The expert examines z values and the interval half widths.

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Standard error of the mean = = 0.273861279
Z-value = 1.644853627
Interval half width = Standard error of the mean * ...

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