D Question 14 2 pts Previously, Arthur constructed a confidence interval from a sample mean of 65, a population standard deviation of 6, 95% confidence level, and a sample size of 200. His colleagues convince him to instead assume a population standard deviation of 7. Which of the following will occur? The sample mean will increase The margin of error will increase The standard error of the mean will decrease The sample standard deviation will increase Next 1 Previous Not saved Submit QuizD Question 12 2 pts A sample of 100 items has a sample mean of 1,420. The population standard deviation is equal to 5. What is the margin of error at the 95% level? O 1.65 O 0.98 O 0.5 O 1.96 Previous Next Not saved Submit QuizD Question 11 2 pts A sample of 100 items has a sample mean of 1,420. The population standard deviation is equal to 5. What is the standard error of the mean? O 9.8 0 5 O 0.5 O 0.98 Next Vext 1 Previous t QuizD Question 13 2 pts Arthur is interested in the mean weight of adult male sea otters. He has data on 200 otters, and the sample mean is 65 pounds. He assumes that the population standard deviation is 6. What is the 95% confidence interval around the mean? [64.84, 65.16] O [59.00, 71.00] O [61.19, 68.81] [64.17, 65.83] Next Previous Not saved Submit QuizD Question 15 2 pts The sample mean is 68, the population standard deviation is 15, and the confidence level is 90%. Which of the following sample sizes will produce a margin of error closest to 3.5? O 50 O 40 60 30 Previous Next Not saved Submit Quiz