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Draw a frequency histogram to display data

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Reference no: EM132173746

You work for a consumer watchdog publication and are testing the advertising claims of a light bulb manufacturer. The manufacturer claims that the life span of the bulb is normally distributed, with a mean of 2000 hours and a standard deviation of 250 hours. You test 20 light bulbs and get the following life spans.

2210

2406

2267

1930

2505

2502

1106

2140

1949

1921

2217

2121

2004

1379

1659

1577

2840

1728

1209

1639

a) Draw a frequency histogram to display these data. Use five classes. Is it reasonable to assume that the life span is normally distributed? Why?

b) Find the mean and standard deviation of your sample.

c) Compare the mean and standard deviation of your sample with those in the manufacturer's claim.

d) Do the data confirm the manufacturer's claim on life span at a 95% level of confidence?

Reference no: EM132173746

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