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Suppose that 14 children, who were learning to ride two-wheel bikes, were surveyed to determine how...

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 seven months with a sample standard deviation of two months. Assume that the underlying population distribution is normal. a.) Construct a 99% confidence interval for the population mean length of time using training wheels. b.) (iii) Calculate the error bound. (Round your answer to two decimal places.)

math   Statistics-And-Probability   
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Answer #1

The statistical software output for this problem is:

On the basis of above output:

a) 99% confidence interval:

(5.39, 8.61)

b) Error bound = Margin of error = (8.61 - 5.39)/2 = 1.61

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