8. Company claims that its employees earns a mean of at least $40 000 in a year and that the population standard is no more than $6 000. Earnings of a random sample of nine employees of this company produced Ex, = 333 and E(x, -x)? = 312 where x, are measured in thousands of dollars and population distribution can be assumed to be normal. Test at 10% significance level the null hypothesis that the population standard deviation is at most $6 000.

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8. Company claims that its employees earns a mean of at least $40 000 in a
year and that the population standard is no more than $6 000. Earnings of a
random sample of nine employees of this company produced
2x, = 333
and
E(x, - x)? = 312
where x, are measured in thousands of dollars and population distribution
can be assumed to be normal. Test at 10% significance level the null
hypothesis that the population standard deviation is at most $6 000.
Transcribed Image Text:8. Company claims that its employees earns a mean of at least $40 000 in a year and that the population standard is no more than $6 000. Earnings of a random sample of nine employees of this company produced 2x, = 333 and E(x, - x)? = 312 where x, are measured in thousands of dollars and population distribution can be assumed to be normal. Test at 10% significance level the null hypothesis that the population standard deviation is at most $6 000.
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