1. (1 point) The probability a Standard Normal Random variable is between 0.36 and 1.1 away from the mean is?' (a) 0.4474 (b) 0.2237 (c) 0.2239 (d) 0.4478 2. (1 point) In the past, the mean production for a certain type of car was known to be 8.5 hours. Recently a change in the production method was introduced and a sample average of 6 cars was found to be 5.5 hours. We want to know if the production time has changed as a result of this new method. The Hypothesis would be (a) Ho : / = 8.5 hours vs. Ha : p 5.5 hours 3. (1 point) In stating a confidence-interval estimate of a population mean, as the level of confidence increases, the size of the interval (1) and as the sample size increases, the size of the interval (2) (a) (1) increases (2) increases (b) (1) decreases (2) increases (c) (1) increases (2) decreases (d) (1) decreases (2) decreases4. (1 point) Based on a sample of 30 randomly selected years, a 90% confidence interval for the mean annual precipitation in one city is from 47.8 inches to 50.2 inches. Find the margin of error (a) 0.10 inches (b) 1.20 inches (c) 1.645 inches (d) 2.40 inches 5. (1 point) For estimating the population mean using a t-curve with n = 24, the t-value having a lower tailed area of 0.10 is (a) -2.500 (b) -1.319 (c) 1.319 (d) 2.500 6. (1 point) At one school, the average amount of time that tenth-graders spend watching television each week is 21.6 hours. The principal introduces a campaign to encourage the students to watch less televi- sion. One year later, the principal wants to perform a hypothesis test to determine whether the average amount of time spent watching television per week has decreased. (a) Ho : / 21.6 hours (c) Ho : # = 21.6 hours vs. Ha : # # 21.6 hours (d) Ho : # = 21.6 hours vs. Ha : /