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Sample Standard Deviation Question?
What is the width of a 95% confidence interval if: mean=7500 hours, sample size=25, standard deviation=500?
And also, if you know about Ho statements, random sample size: 36, abrasive content has to be exactly 15 oz per batch, the sample of 36 random items shows an abrasive content of 15.4 oz. What is the correct hypothesis to test the abrasive content?
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