5. For a sample of 150 that has a mean of 6,540 and a standard deviation of 2,644, calculate the 95% confidence interval. a. 5,433.77 to 7,624.36 b. 5,946.30 to 7, 133.70 c. 6, 173.64 to 6,906.37 d. 6, 116.87 to 6,963.13 6. What would be the 95% confidence limits for a sample that included 325 individuals with a mean of 8 and a standard deviation of 11.36? a. (6.765, 9.235) b. (6.931, 9.069) C. (6.267, 9.235) d. (6.267, 9.733) 7. What is the 95% confidence limit for a sample of 42 that has a mean of 34.45 and a standard deviation of 4.32? a. 95% c.i. (33.143, 35.765) b. 95% c.i. (34.135, 35.752) c. 95% c.i. (32.148, 35.752) d. 95% c.i. (31.148, 35.765) 8. For a sample of 20 individuals with a mean of $64,000 and a standard deviation of $14,327, what would the confidence interval be for an a = .05. a. 57,294.83 to 70,705.17 b. 60,796.29 to 70,705.37 c. 57,294.63 to 70,682.94 d. 60,796.29, 70,682.93