A study of 200 insomniacs paid for by the Serta Mattress Company - 6265

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A study of 200 insomniacs paid for by the Serta Mattress Company found that the average insomniac counted 350 sheep before falling asleep, with a standard deviation of 120. An insomniac is a person who has difficulty falling asleep. Some useful numbers might be:

  

=NORMSINV(0.89)1.2265

=NORMSINV(0.945)1.5982

=TINV(0.89,199)0.1385

=TINV(0.11,199)1.6053

=TINV(0.055,199)1.9302

Solution Description

 

A study of 200 insomniacs paid for by the Serta Mattress Company found that the average insomniac counted 350 sheep before falling asleep, with a standard deviation of 120. An insomniac is a person who has difficulty falling asleep. Some useful numbers might be: