The following data represents the number of insects counted in two different locations (A and B). Construct a 80% confidence interval for o2/o²B. (round to the nearest tenth): DATA: Observation 1 2 3 4 5 6 7 8 9 LOCATION A 45 45 32 46 45 44 43 49 48 LOCATION B 49 41 49 42 48 42 49 47 1. In the answer box enter the upper confidence interval. 2. Evaluate the confidence interval and indicate if the variances are (yes) or are not (no) homogeneous (yes/no; place your answer right beside the upper confidence interval. Do not leave a space between the two answers).

Construct both a 90% and a 99% confidence interval for B1. B1 = 42, s = 8.8, SSzx = 64, n = 19 90% : < B1 < 99% : < B1 <

2. What is the 95% confidence interval for the difference in the population means using paired samples given the sample data: xd= 2.05, sd= 0.75, n=16 D. [1.65 , 2.45] B. [1.59, 2.51] A. [1.73, 2.37] C. [1.84, 2.26] 4. A test is conducted on a new drug treatment to improve patient’s memories. The scores of the 9 subjects before and after the new treatment are given on the table.                                                            Before 55 57 57 64 64 67 70 71 71 After 57 63 67 67 70 72 73 80 81   What is the 95% confidence interval for the improvement of test scores after the new treatment is given to the patients? A. [3.63 , 8.37] C. [3.35 , 8.65] B. [3.69 , 8.31] D. [3.17 , 8.83]

To test the efficacy of a new cholesterol-lowering medication, 10 people are selected at random. Each has their LDL levels measured (shown below as Before), then take the medicine for 10 weeks, and then has their LDL levels measured again (After).                   Subject              Before                 After                      1                       188                    187                      2                       114                    125                     3                        167                    141                     4                        141                    109                     5                        151                     145                     6                         182                    152                     7                         193                    166                     8                         173                    154                     9                         135                    145                    10…