The national average for an 8th grade reading comprehension test is 73. a school district claims that its eighth-graders outperform the national average. in testing the school district's claim, how does one define the population parameter of interest?

a. the standard deviation of the score on the 8th grade reading comprehension test

b. the number of 8th graders that took the reading comprehension test

c. the proportion of 8th graders that scored above 73 on the reading comprehension test

d. the mean score on the 8th grade reading comprehension test

The axis of symmetry for the graph of the function f(x)=1/4^2+bx +10 is x=6. what is the value of b?

What are the excluded values? m+5/mn+3m

Which scenarios are most effectively explored by conducting an experiment? there is more than one correct answer. select all that apply. researchers want to study the effectiveness of a particular drug for treating migraines. they want to know which dosage of the drug yields the best results with the least side effects. to ensure fair results, the researchers want to ensure that participants and dosage administrators do not know which dosage participants receive. a teacher wants to plan a class fieldtrip and quickly determine where students prefer to go for the class fieldtrip. a car mechanic wants to know which of two engine brands makes better-performing engines. he wants to test the engines in identical situations and rate their performance in a way that can be fairly measured. a chemist studies the properties of a metal compound. she wants to know how the sample size of the metal affects its ability to conduct electricity. she wants to conduct the research in a controlled environment to minimize bias. a realty company wants to know the average income of its clients. the company wants to gather data income from current clients.