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What are the degrees of freedom

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The life in hours of a 75-watt bulb manufactured by a company follows a normal distribution but has an unknown standard deviation. A simple random sample of 15 bulbs is selected and the lives of the bulbs are measured. The average life of the 15 bulbs is found to be 900 hours. The sample standard deviation, s, is 200 hours.

Since we do not know the standard deviation, we will use the t distribution..

What are the degrees of freedom? (no decimals)

What is the standard error of xbar (s / sqrt(n))? (three decimals)

For a 90% confidence, what is the t-value? (three decimals)

Using 90% confidence, what is the lower confidence interval number? Blank 4 (no decimal for the remaining answers)

What is the higher confidence interval number at 90% confidence?

What is the width of the confidence interval?

For a confidence interval of 99% with the x-bar, sample size and standard deviation remaining the same, what would be the width of the confidence interval?

Reference no: EM132399906

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