Question 186797
1. If the alternate hypothesis states that  does not equal 4,000, what is the rejection region for the hypothesis test? 
Ans: A. Both tails
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2. If 20 out of 50 students sampled live in a college dormitory, what is the estimated proportion of students at the University living in a dormitory?
Ans: B) 0.40
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3. Suppose we are testing the difference between two proportions at the 0.05 level of significance. If the computed z is –1.07, what is our decision? 
Ans: B) Do not reject the null hypothesis
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The mean gross annual incomes of certified tack welders are normally distributed with the mean of $20,000 and a standard deviation of $2,000. The ship building association wishes to find out whether their tack welders earn more or less than $20,000 annually. The alternate hypothesis is that the mean is not $20,000. 
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4. If the level of significance is 0.10, what is the decision rule?
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Ans: A. Do no reject the null hypothesis if computed z lies between –1.65 and +1.65; otherwise, reject it 
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5. Which of the following is the alternate hypothesis?
Ans) A) z is not equal to $20,000
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6. If the level of significance is 0.10, what is the critical value?
Ans: A) 1.65
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Cheers,
Stan H.