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StatisticsQ&A LibrarySuppose that 14 children, who were learning to ride two-wheel bikes, were surveyed to determine how long they had to use training wheels. It was revealed that they used them an average of six months with a sample standard deviation of three months. Assume that the underlying population distribution is normal.Construct a 99% confidence interval for the population mean length of time using training wheels.What is the error bound? (Round to 3 decimal places)Question

Asked Nov 16, 2019

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Suppose that 14 children, who were learning to ride two-wheel bikes, were surveyed to determine how long they had to use training wheels. It was revealed that they used them an average of six months with a sample standard deviation of three months. Assume that the underlying population distribution is normal.

Construct a 99% confidence interval for the population mean length of time using training wheels.

What is the error bound? (Round to 3 decimal places)

Step 1

The provided information are:

Step 2

The formula to calculate the confidence interval for population mean is:

Step 3

Here, the **population standard deviation** is unknown. So, the *t*-critical value is used.

The degrees of freedom is: *df *= *n* - 1 = 14 - 1 = 13

The criti...

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