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

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Basic Math

A group of 10 adults is asked to type a passage of text. Hereare 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 forthe same text passage is normally distributed with unknown mean ?,and known standard deviation ?=1.6. At significance level ?=0.005,is the sample showing strong evidence that mean typing time of thistext passage is other than 30? Accurate to 4 decimal places, whichof the following is ?¯x used for this testing hypothesisproblem?

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