A random sample of 50 portable television sets of a certain brand showed a mean life span of 7.8 years with a population

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A random sample of 50 portable television sets of a certain brand showed a mean life span of 7.8 years with a population

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A random sample of 50 portable television sets of a certain
brand showed a mean life
span of 7.8 years with a population variance of 1.7 years. While a
random sample of 55
portable television sets of another brand showed a mean life span
of 6.5 years with a
population variance of 1.5 years. Construct a 95% confidence
interval for the true
difference of mean life span.
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