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Question regarding the population standard deviations

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Reference no: EM131068819

Pooling is used in calculating the standard error for the difference between means when the population standard deviations are unknown, for which of the following reasons?

  • because the weighted average of the two sample variances gives a better estimate of the common population variance
  • because the weighted average of the two population variances gives a better estimate of the common sample variance
  • because the variances in the populations are assumed equal
  • because the null hypothesis usually shows there is no difference between the means

Reference no: EM131068819

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