The governor of a state wanted to assess the public education system of the state. She instructed a group of researchers to create a test to assess the knowledge of every high school senior in the state. The researchers administered the tests and found that the average score was 74 points out of 100, with a standard deviation of 20 points. Complete parts (a) through (c) below. a. Identify the population and variable. Choose the correct population below. A. The population is the group of all high school seniors in the state. B. The population is the group of every state's governor. C. The population is the group of all high school teachers in the state. O D. The population is the group of all high school students in the state. Choose the correct variable below. A. The variable is the number of high school seniors. O B. The variable is the test length. c. The variable is the test score. O D. The variable is the number of high school students. b. For samples of size 225, find the mean u; and standard deviation o; of all possible sample mean test scores. (Type an integer or a decimal.)

A study dealing with health care issues plans to take a sample survey of 1500 Americans to estimate the proportion who have health insurance and the mean dollar amount that Americans spent on health care this past year. a. Identify the population parameters that this study will estimate. b. Identify the statistics that can be used to estimate these parameters. a. Identify two population parameters that this study will estimate. A. The population proportion who have health insurance B. The sample proportion who have health insurance C. The population mean dollar amount spent on health care this past year D. The number of people who have health insurance b. Identify two statistics that can be used to estimate these parameters. O A. The population proportion B. The sample mean C. The sample proportion D. The sample size

SOLVE FOR a AND b, include complete solutions.

For an article in a magazine, 20 different vehicles were selected to obtain data for comparison.  From each vehicle the price in dollars, the fuel economy (in miles per gallon), the number of doors, the type of vehicle (car, truck, SUV, other), and if it had all wheel drive or not.                                          ​a. What are the cases?     ​b.  List the variables and identify them as quantitative or categorical.