Posted by Tom 84 on Tuesday, June 18, 2013 at 7:40pm.
Assume that z is the test statistic. (Give your answers correct to two decimal places.)
(d) Calculate the value of z for Ho: ì = 81, ó = 13.3, n = 51, x = 79.7.
1.16 is my answer and it is wrong, can someone tell me how I missed this one, done several and got them right but not this one.

math check  Kuai, Tuesday, June 18, 2013 at 7:54pm
Yes. your anwser is wrong.

math check  Tom 84, Tuesday, June 18, 2013 at 8:06pm
In case you think I did not work it and just put a number down I worked it like this 79.781 over 13.3sqrt 51=1.3/1.8623 so did I put the formula in wrong or what, I got all the other ones right with this formula?

math check  Kuai, Tuesday, June 18, 2013 at 8:18pm
z= (79.7 81)/(13.3/sqrt(51))
z= 1.3/1.862372512
z = 0 .698 or 0.70

math check  Tom 84, Tuesday, June 18, 2013 at 8:32pm
Thank you, I am not sure how my calculator came up with that answer. But I had worked it out like you did.

math check  Kuai, Tuesday, June 18, 2013 at 8:45pm
because you multiply 13.3 sqrt (51) but it is division. 13.3/sqrt(51).
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