Question: NEED HELP ASAP! PROBLEM: A city planner claims that the mean speed of westbound traffic along a road segment during morning peak hours is less

NEED HELP ASAP!

PROBLEM: A city planner claims that the mean speed of westbound traffic along a road segment during morning peak hours is less than 50 miles/hr. In a random sample of 45 motor vehicle traveling westbound along the road segment during morning peak hours, the mean speed is 51 miles/hr. Assume the standard deviation is 5 mils/hr. A t = 0.05, is there enough evidence to support the city's planners claim?

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