StatisticsdrillMargin of error for a mean (t)
A statistics problem from Statisticsdrill. Solve it with one answer box, with a fresh sample on every attempt and the worked steps and spreadsheet function in the answer, and it is checked the moment you submit.
The task
A random sample of 8 minutes customers waited on hold: 19, 14, 11, 9, 10, 6, 11, 15. What is the margin of error of a 90% confidence interval for the population mean, using the t distribution? Round to 2 decimal places.
What this problem teaches
The formula: ME = t* × s / √n.
A hint if you get stuck
Margin of error = t* × s / √n, with t* from n - 1 degrees of freedom and s the sample standard deviation.
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