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QUESTION 5 Construct a 95% confidence interval for the population mean, J. A study of 14 bowlers showed that their average score was 192 with a standard deviation of 8. What is the upper limit of this confidence interval? Answer to 2 decimal places. QUESTION 6 The grade point averages for 10 randomly selected high school students are listed below. Assume the grade point averages are normally distributed. 2.0, 3.2, 1.8, 2.9, 0.9, 4.0, 3.3, 2.9, 3.6, 0.8 Find a 90% confidence interval. What is the lower limit of this confidence interval? Answer to 2 decimal places. QUESTION 7 Many people think that a national lobby's successful fight against gun control legislation is reflecting the will of a minority of Americans. A random sample of 4000 citizens yielded 2250 who are in favor of gun control legislation. Estimate the true proportion of all Americans who are in favor of gun control legislation using a 95% confidence interval. What is the upper limit of this confidence interval? Answer to 2 decimal places. QUESTION 8 A state highway patrol official wishes to estimate the number of drivers that exceed the speed limit traveling a certain road. How large a sample is needed in order to be 99% confident that the sample proportion will not differ from the true proportion by more than 3% QUESTION 9 The standard IQ test has a mean of 96 and a standard deviation of 14. We want to be 90% certain that we are within 4 IQ points of the true mean. Determine the required sample size. QUESTION 10 A random sample of 16 fluorescent light bulbs has a mean life of 645 hours with a standard deviation of 31 hours. We have constructed a 95% confidence interval and it is (628.5, 661.5). What is the correct interpretation of this confidence interval? A. We are 95% confident that the population mean life of all fluorescent light bulbs is between 628.5 and 661.5. B. We are 95% confident that the sample mean life of all fluorescent light bulbs is between 628.5 and 661.5. C. We have 95% proof that the population mean life of all fluorescent light bulbs is between 628.5 and 661.5. D.We have 95% proof that the sample mean life of all fluorescent light bulbs is between 628.5 and 661.5