A company produces an electric tool whose average life time is 260 days and variance 169 days. It is claimed that, in a newly developed process the mean life time can be increased. If the new process has increased the mean life time to 276 days, assuming a sample of 80 bulbs with estimated life time 269

MATLAB: An Introduction with Applications
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10. A company produces an electric tool whose average life time is 260 days and variance 169 days. It is
claimed that, in a newly developed process the mean life time can be increased. If the new process has
increased the mean life time to 276 days, assuming a sample of 80 bulbs with estimated life time 269
days, find a and B.
Transcribed Image Text:10. A company produces an electric tool whose average life time is 260 days and variance 169 days. It is claimed that, in a newly developed process the mean life time can be increased. If the new process has increased the mean life time to 276 days, assuming a sample of 80 bulbs with estimated life time 269 days, find a and B.
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