An industrial designer wants to determine the average amount of time it takes an adult to assemble an “easy to assemble” toy. A sample of 16 times yielded an average time of 19.9 minutes, with a...

An industrial designer wants to determine the average amount of time it takes an adult to assemble an “easy to assemble” toy. A sample of 16 times yielded an average time of 19.9 minutes, with a sample standard deviation of 4.4 minutes. Give the following information for a 95% confidence interval.

Sample mean =

Standard Deviation =

Sample size =

Do you use Z or t?

Z or t (value from the table) =

Standard Error (Rounded to one decimal place)=

Margin of Error (Rounded to one decimal place) =

Lower limit (Rounded to one decimal place) =

Upper limit (Rounded to one decimal place) =