Statistics and Probability

A teacher surveys 25 of the current 321 enrolled students at a local college. What is the size of the sample: What is the size of the population: A political scientist surveys 22 of the current 159 representatives in a state's congress. 2 What is the size of the sample: What is the size of the population: 3 A student took five exams in a course last semester. The scores are shown below. 83, 85, 87, 86, 94 Calculate the mean, variance and standard deviation. Round to 4 decimal places when needed and use rounded answers for future calculations. The mean is / = The variance is o' = The standard deviation is o = A student took six exams in a course last semester. The scores are shown below. 85, 81, 95, 86, 93, 99 Calculate the mean, variance and standard deviation. Round to 4 decimal places when needed and use rounded answers for future calculations. The mean is / = The variance is o' = The standard deviation is o = Calculate i (x-bar) for the data shown, to two decimal places X 14.4 23.4 28.6 11.4 25.5 5.7 18.2 27.4 You measure 37 turtles' weights, and find they have a mean weight of 57 ounces. Assume the population standard deviation is 10.8 ounces. Based on this, construct a 99% confidence interval for the true population mean turtle weight. Give your answers as decimals, to two places ounces