Homework Help: statistics please

Posted by gina on Saturday, December 15, 2012 at 4:01pm.

a basketball scout randomly selected 144 players and timed howlong eah player took to perform a certain drill. the times in thissample were distributed with a mean of 8 minutes. the populationstandard deviation was known to be 3 minutes.
(a) find the critical value for a 95% confidence interval forthe population mean of drill times.
(b) using the 95% confidence interval,estimate the populationmean of drill times.

statistics please - MathGuru, Saturday, December 15, 2012 at 7:19pm
Formula for 95% confidence interval:

CI95 = mean ą 1.96 (sd/√n)
...where ą 1.96 represents the 95% interval using a z-table.

With your data:
CI95 = 8 ą 1.96 (3/√144)

Finish the calculation.

I hope this helps.

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