A toy manufacturer wants to see how long, on average, a new toy captures children's attention. He tests 15 children sele

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A toy manufacturer wants to see how long, on average, a new toy captures children's attention. He tests 15 children sele

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A Toy Manufacturer Wants To See How Long On Average A New Toy Captures Children S Attention He Tests 15 Children Sele 1
A Toy Manufacturer Wants To See How Long On Average A New Toy Captures Children S Attention He Tests 15 Children Sele 1 (18.56 KiB) Viewed 89 times
A toy manufacturer wants to see how long, on average, a new toy captures children's attention. He tests 15 children selected at random and finds that their mean attention spans 31 minutes with a standard deviation of 7 minutes. If we assume that attention spans are normally distributed, find a 90% confidence Interval for the mean attention span of children playing with this new toy. Then find the lower limit and upper limit of the 90% confidence interval Carry your intermediate computations to at least three decimal ploon, Round your answers to one decimal place (if necessary, consult a list of formulas) Lower litt 12 Upper limit:
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