University Officials

16. If university officials say that at least 70% of the voting student population supporting the fee increase, If the 95% confidence interval is [0.75, 0.85], what conclusion can be drawn based on a 95% level of confidence?

Answer 

70% is not in the interval, need to take another sample

70% is not in the interval, so assume it will not be   supported

70%   is below the interval, so assume it will be supported

Since this was not based on population, cannot make   conclusion

 2 . It is claimed that in a bushel of peaches less than ten percent are defective. A sample of 400 peaches is examined and 50 are found to be defective. What is the z-statistic?

Answer 

0.025

0.278

-1.65

1.67

3. What are the two critical values for a two-tailed test with a 0.01 level of significance when n is large and the population standard deviation is known?

Answer 

Above 1.96 and below -1.96

Above 1.65 and below -1.65

Above   2.58 and below -2.58

Above 1.00 and below -1.00

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