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