Question

8. Which of the correlation coefficients shown below indicates the strongest linear correlation? a) - 0.903 b) 0.720 c) -0.410 d) 0.203 9. A manager of the credit department for an oil company would like to determine whether the average monthly balance of credit card holders is equal to $75. An auditor selects a random sample of 20 accounts and finds that the average owed is $83.40 with a sample standard deviation of $23.65. If you were to conduct a test to determine whether the auditor should conclude that there is evidence that the average balance is different from $75, which test would you use? a) Z-test of a population mean b) Z-test of a population proportion c) t-test of population mean with 19 degrees of freedom d) t-test of a population mean 20 degrees of freedom 10 A poll found that 46% of men voters and 50% of women voters support a particular candidate. To test whether this candidate has equal levels of support between men and women voters, the null hypothesis should be: a) Ho:ul - u2 <0 versus Hul-u2 > 0 b) Hosul - 2 2 0 versus Hul-u2 < 0 c) Ho:ul - u2 = 0 versus Huul - 420 d) Houl-u2 #0 versus Hul - 2 = 0 Part II - Word Problems Q11 A sample of 50 voters was taken and they were asked if they supported the incumbent representative. The percentage indicating support was 46%, which were 23 voters of the original sample. What is the 95% confidence interval for the population percentage supporting the incumbent? [4 Points

Answer 1