A group of 10 adults is asked to type a passage of text. Here are their...

A group of 10 adults is asked to type a passage of text. Here are their times in seconds: 28.9, 27.3, 29.1, 31.5, 27.7, 29.3, 28.3, 30.1, 30.7, 30.9 where ¯x=29.38 and s=1.4. Typing time for the same text passage is normally distributed with unknown mean μ, and known standard deviation σ=1.6. At significance level α=0.005, is the sample showing strong evidence that mean typing time of this text passage is other than 30? Accurate to 4 decimal places, which of the following is σ¯x used for this testing hypothesis problem?

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milcah answered 1 year ago

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