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Computer Terminal Reports

The manufacturer of a computer terminal reports in its advertising that the mean life of the terminal, under normal use, is 6 years, with a standard deviation of 1.4 years. (Assume these are population values.) A sample of 90 units sold 10 years ago revealed the following distribution of the lengths of life. At the .05 significance level, can the manufacturer conclude that the terminal lives are normally distributed?

Length of life (years) Frequency
Up to 4 7
4 up to 5 14
5 up to 6 25
6 up to 7 22
7 up to 8 16
8 or more 6

Solution Summary

The solution discusses The manufacturer of a computer terminal reports in its advertising that the mean life of the terminal, under normal use, is 6 years, with a standard deviation of 1.4 years. (Assume these are population values.) A sample of 90 units sold 10 years ago revealed the following distribution of the lengths of life. At the .05 significance level, can the manufacturer conclude that the terminal lives are normally distributed?

Length of life (years) Frequency
Up to 4 7
4 up to 5 14
5 up to 6 25
6 up to 7 22
7 up to 8 16
8 or more 6

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