SOLUTION: the mean weight of trucks traveling on a particular section of a highway is not known. A highway inspector needs an estimate of the mean. He selescts a random sample of 49 trucks

Question 296773: the mean weight of trucks traveling on a particular section of a highway is not known. A highway inspector needs an estimate of the mean. He selescts a random sample of 49 trucks passing the weight station and finds the mean is 15.8 tons with a sample standard deviation of 3.8 tons. in tons and rounding to the closest 0.1 ton, what is the 95 percent interval for the population mean?
14.7 and 16.9 tons
13.2 and 17.6
10.0 and 20.0 tons
16.1 and 18.1 tons
none of the above
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
the mean weight of trucks traveling on a particular section of a highway is not known. A highway inspector needs an estimate of the mean. He selescts a random sample of 49 trucks passing the weight station and finds the mean is 15.8 tons with a sample standard deviation of 3.8 tons. in tons and rounding to the closest 0.1 ton, what is the 95 percent interval for the population mean?
------------
Using both the t-dist and the z-dist on a TI
caluculator I get the following:
14.7 < u < 16.9
===============
Cheers,
Stan H.
===============

14.7 and 16.9 tons
13.2 and 17.6
10.0 and 20.0 tons
16.1 and 18.1 tons

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