Using traditional methods it takes 9292 hours to receive an advanced flying license. A new training technique using Computer Aided Instruction (CAI) has been proposed. A researcher used the technique on 7070 students and observed that they had a mean of 9393 hours. Assume the population variance is known to be 3636. Is there evidence at the 0.050.05 level that the technique lengthens the training time?
Step 1 of 6 :
State the null and alternative hypotheses.
Step 1 of 6 : The null and alternative hypothesis is ,
The test is one-tailed test.
Since , the population standard deviation is known.
Therefore , use the normal distribution.
Step 2 of 6 : The test statistic is ,
Step 3 of 6 : The critical value is ,
; From Z-table
Step 4 of 6 : Decision : Here , the value of the test statistic does not lies in the rejection region.
Therefore , fail to reject the null hypothesis.
Step 5 of 6 : Conclusion : Hence , there is not sufficient evidence to support the claim that the technique lengthens the training time.
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