This is the first time Patty is teaching INDE 315 as a distance learning (DL) class and wants to understand whether students are spending less time (in hours) on her class than they should be, because it is DL and is taken over the summer. It is known from previous studies from other DL classes the population standard deviation of this variable is about 4 hours. Fill in the blanks: 1. Patty sampled the 65 students in this class and found a sample mean of 6.90 hours worked. Construct a 95% two-sided confidence interval on / based on this sample. Round to 2 decimal points. 2. Multiple Choice: Patty is using a 95% confidence in her interval, instead of 100%, because she needs to account for the fact that: a. The sample may not be truly random. b. We have a sample, and not the whole population. c. The distribution of hours worked may be skewed d. All of the above The correct answer is letter 3. Multiple Choice: Patty is not satisfied with her confidence interval and wants to do another study to find a shorter confidence interval. What should she do in order to ensure she achieves a shorter confidence interval with an Error of 0.5? You must show your work on your paper to receive full credit for this problem. a. She should keep her confidence level the same and increase her sample size to 246. b. She should keep her confidence level the same and increase her sample size to 245. c. She should increase her confidence level to 99% and increase her sample size to 246. d. She should increase her confidence level to 99% and increase her sample size to 245. The correct answer is letter