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A ramdon of 30 birth records from a local hospital were slected. Assume that the distrubition birth weights is normally distributed. In a sample average birth weight was 123 ounces with a standard deviation of 7.5 ounces.

Calculate the 99% confidence interval for the unknown parameter the mean birth weight for all babies in that hospital. Report the upper and lower limit of the interval.

Show your work!

What is the degree of freedom?

Write the formula for solving the for the Estimation (E)?

Calculate the upper and lower limits of the confidence level

Upper =
Lower =

The hospital claims that the average birth weight in 2013 was 119 ounces. Was this likely or unlikely results given the confidence interval?

Draw a bell curve diagram to help expalin your analysis

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