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Posted by on Saturday, April 27, 2013 at 6:47am.

A Toyota dealer wants to find out the age of their customers (for advertising purposes). They want the margin of error to be 3 years old. Suppose the sigma is 13 years old. If they want a 90% confidence interval, how many people do they need to know about?

  • Statistic - , Saturday, April 27, 2013 at 12:49pm

    90% = mean ± 1.645 SEm

    SEm = SD/√n

    3 = 1.645 SEm

  • Statistic - , Sunday, April 28, 2013 at 8:32am

    at least 47

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