The governor of a state wanted to assess the public education system of the stat

Question

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 80 points out of 100, with a standard deviation of 30 points. Complete parts (a) through (c) below. O D. The population is the group of all high school teachers in the state. . Choose the correct variable below O A. O B. OC. The variable is the number of high school seniors. The variable is the test length. The variable is the number of high school students. D. The variable is the test score b. For samples of size 200, find the mean , and standard deviation '80. (Type an integer or a decimal.) -2.1 (Round to one decimal place as needed.) of all possible sample mean test scores. c. Repeat part (b) for samples of size 400 (Type an integer or a decimal.)

Explanation / Answer

Solution:- Given that information mean = 80 , sd = 30 , there fore n = 400

c) x = 80

x= sd/sqrt(n) = 30/sqrt(400) = 1.5

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