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Unformatted text preview: ̅
c) ( ̅
√ √ ( )
, 2.2 (the population mean tested for) falls outside the confidence interval,
suggesting that the population means of the two different groups are significantly
different. This result is consistent with what was found in (a).
Test statistic: ̅
√ √ p-value
At a 1% level of significance, fail to reject
), conclude that the new
method does not significantly reduce the mean number of sulphur parts per million.
At a 5% level of significance, reject
), conclude that the new method
does significantly reduce the mean number of...
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- Spring '14