QUESTION 5 Your statistics instructor wants you to determine a confidence interval estimate for the mean test score. Past experience indicated that tests scores are normally distributed with a sample mean of 160 and a population standard deviation of 45. A 90% confidence interval estimate if your group has 36 students is: 41 1. 145.3 to 174.7 2. 157.55 to 162.45 3. 152.5 to 167.5 4. 140.65 to 179.35 5. 147.66 to 172.34