Question 334646: A toy manufacturer wants to see how long, on average, a new toy captures 12 children's attention. He tests children selected at random and finds that their mean attention span is 7 minutes with a standard deviation of minutes. If we assume that attention spans are normally distributed at 29 minutes, find a 90% confidence interval for the mean attention span of children playing with this new toy.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A toy manufacturer wants to see how long, on average, a new toy captures 12 children's attention.
He tests 12 children selected at random and finds that their mean attention span is 7 minutes with a standard deviation of ? minutes.
If we assume that attention spans are normally distributed at 29 minutes, find a 90% confidence interval for the mean attention span of children playing with this new toy.
A number is missing from your post.
Cheers,
Stan H.
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