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Sample standard deviation

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1. A purchasing agent at the Kelly Bread Company wants to estimate the mean daily usage of rye flour. She takes a sample for 50 straight days and finds that the sample mean is 180 pounds with a sample standard deviation of 38.5 pounds.

a) State the 90% confidence interval for the mean. (Round to hundredths)

b) State the margin of error (Round to tenths)

2. A high school counselor is interested in the percentage of students who will be going to college. She randomly picks 60 students and finds that 53 will be going to college. Use a 95% confidence level to find the population proportion.

a) State the 95% confidence interval for population proportion. (Round to tenth of a percent)

b) State the margin of error (Round to tenth of a percent) 

Could use some help with these.

Reference no: EM131936231

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