In a survey, 25 people were asked how much they spent on their child's last birthday...

In a survey, 25 people were asked how much they spent on their child's last birthday gift. The results were roughly shaped as a normal curve with a mean of $40 and standard deviation of $6. Construct a confidence interval at a 98% confidence level.

Give your answers to one decimal place.

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Karen wants to advertise how many chocolate chips are in each Big Chip cookie at her bakery. She randomly selects a sample of 75 cookies and finds that the number of chocolate chips per cookie in the sample has a mean of 17.5 and a standard deviation of 2.4. What is the 90% confidence interval for the number of chocolate chips per cookie for Big Chip cookies? Enter your answers accurate to 4 decimal places.

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If n=370 and ˆpp^ (p-hat) = 0.41, construct a 90% confidence interval.

As in the reading, in your calculations:
--Use z = 1.645 for a 90% confidence interval
--Use z = 2 for a 95% confidence interval
--Use z = 2.576 for a 99% confidence interval.
Give your answers to three decimals

[,]

Expert Solution

1)

2)3)

Hope this will help you. Thank you :)

orchestra answered 2 years ago

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