1. The population of complaints follows a normal probability distribution. 2.The

Question

1. The population of complaints follows a normal probability distribution.

2.The population of complaints not follows a normal probability distribution.

3. The population of complaints follows a uniform probability distribution.

Most air travellers now use e-tickets. Electronic ticketing allows passengers to not worry about a paper ticket, and it costs the airline companies less to handle than paper ticketing. However, in recent times, the airlines have received complaints from passengers regarding their e-tickets, particularly when connecting flights and a change of airlines were involved. To investigate the problem, an independent agency contacted a random sample of 20 airports and collected information on the number of complaints the airport had with e-tickets for the month of March. The information is reported below:

Explanation / Answer

1) 1. The population of complaints follows a normal probability distribution.

b)for 19 degree if freedom and 0.02 level; reject Ho if t<-2.2047

test stat t=(X-mean)/std error =(13.25-15)/0.566 =-3.0919

reject Ho there is enough  evidence to conclude that the mean number of complaints is less than 15.

X 15 17 16 10 11 10 14 15 12 16 13 11 10 17 12 17 14 13 10 12 mean(X) 13.250 std deviation(S) 2.531 std error =S/(n)1/2 0.566

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