At the 5% level of significance, test the claim that the mean for all planes is more...

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...than 50 m Please Help!!!? An aircraft manufacturer randomly selects 12 planes of the same model and tests them to determine the distance(in meters) they recquire for takeoff. The sample mean and standard deviation are computed to be 524 m and 23 m. At the 5% level of significance, test the claim that the mean for all such planes is more than 50 m.
 
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