Question

1. You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=46.5. You would like to be 95% confident that your esimate is within 5 of the true population mean. How large of a sample size is required? n = Do not round mid-calculation. However, use a critical value accurate to three decimal places — this is important for the system to be able to give hints for incorrect answers. 2. You measure 49 backpacks' weights, and find they have a mean weight of 69 ounces. Assume the population standard deviation is 10.1 ounces. Based on this, what is the maximal margin of error associated with a 90% confidence interval for the true population mean backpack weight. Give your answer as a decimal, to two places ± ounces

          1. You want to obtain a sample to estimate a population mean.
Based on previous evidence, you believe the population standard
deviation is approximately σ=46.5. You would like to be 95%
confident that your esimate is within 5 of the true population
mean. How large of a sample size is required?
n = 
Do not round mid-calculation. However, use a critical value
accurate to three decimal places — this is important for the system
to be able to give hints for incorrect answers.
2. You measure 49 backpacks' weights, and find they have a
mean weight of 69 ounces. Assume the population standard deviation
is 10.1 ounces. Based on this, what is the maximal margin of error
associated with a 90% confidence interval for the true population
mean backpack weight.
Give your answer as a decimal, to two places
±  ounces

Added by Sabrina K.

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