# 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. Standard errormargin of error

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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.

Standard error

margin of error

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Step 1

The standard error of the distribution of sample means is obtained as follows:

Step 2

Thus, the standard error of the distribution of sample means is 1.1.

The degrees of freedom is obtained as follows:

Step 3

From the t table, the critical value for 15 degrees of freedom with 95% con...

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