A biologist claims that warmer temperatures affect the growth of plants. He randomly assigns 90 plants at the same stage of development to two treatment groups, 20oC or 35oC. After three months, he measures the weights of the plants and calculates the difference in mean weights of the plants for each temperature (35oC – 20oC). What is the appropriate inference procedure?

The mathematical expression 9€ t means

Use the distributive law to multiply. 3(4x + 5y + 6)

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.