2:51 4 I ? C} ('2 AA 8 myopenmathcom Mastery Test #4 14 points possible 0/14 answered (9 1hr59mins X Progress saved Submit and End 15' 0 Question 1 v 81 pt '0 1 G) Details 8.1 Confidence Interval for Mean u with 0 Known (Z- table) You measure 47 turtles' weights, and find they have a mean weight of 31 ounces. Assume the population standard deviation is 11.8 ounces. Based on this, construct a 90% confidence interval for the true population mean turtle weight. Give your answers as decimals, to two places CE i Error :1 i > Next Question 2:51 4 I ? [3' B myopenmath.com .v...'-.J I--- .. . 14 points possible 0/14 answered (9 1hr59mins X Progress saved Submit and End VE' 0 Question 2 v 81 pt '0 1 6) Details 8.3 Confidence Interval Summary JaJuan wants to estimate the average student GPA at his high school. He surveys 40 students and finds their average GPA to be 2.69 with a standard deviation of 0.28. Which statement is true? JaJuan is estimating... O a mean and will use the t-table because the population standard deviation is known 0 a mean and will use the t-table because the population standard deviation is unknown 0 a proportion and will use the Z-table O a mean and will use the Z-table because the population standard deviation is unknown 0 a proportion and will use the t-table O a mean and will use the Z-table because the population standard deviation is known > Next