subject
Mathematics, 22.04.2021 18:20 allanarayos5597

In 2017, the average reading score of the fourth graders in the United States was 222 points. In a simple random sample of 16,000 fourth graders taken nationally in 2019, the average reading score is 221 and the SD is 40 points. Is the national average reading score for fourth graders in 2019 different from what it was in 2017? Or is the observed difference just chance variation? Perform a test of hypotheses to answer the question, in the following steps. a) State an appropriate null hypothesis in non-technical terms and also as a set of assumptions about random variables.
b) State an appropriate alternative hypothesis.
c) What test statistic are you going to use? Justify your choice
d) Find an exact or approximate p-value.
e) At the 5% level, what is the conclusion of the test? Why?

ansver
Answers: 3

Other questions on the subject: Mathematics

image
Mathematics, 21.06.2019 14:00, angellv917
At the many chips cookie company they are serious about the number of chocolate chips in their cookies they claim that each cookie hasn't c chips. if their claim is true there will be 200 chips in 10 cookies
Answers: 2
image
Mathematics, 21.06.2019 15:00, nkh69
Given: x + y = 6. if xe (-15, -6, -1), then which of the following sets of ordered pairs are solutions? © {(-15, -21), (-6, -12), (-1, -7)} [(-15, 21), (-6, , 7)} {(-15, 21), (-6, 12), (-1, -7)}
Answers: 2
image
Mathematics, 21.06.2019 19:00, 0055babs
The width of a rectangle is 20 units. can the perimeter p of the rectangle be 64 units when its length x is 11 units? no, because p = 2x + 2(20) no, because p ≠ 2x + 2(20) yes, because p ≠ 2x + 2(20) yes, because p = 2x + 2(20)
Answers: 1
image
Mathematics, 22.06.2019 00:00, hdwoody2002
Percy rides his bike 11.2 miles in 1.4 hours at a constant rate. write an equation to represent the proportional relationship between the number of hours percy rides, x, and the distance in miles, y, that he travels.
Answers: 1
You know the right answer?
In 2017, the average reading score of the fourth graders in the United States was 222 points. In a s...

Questions in other subjects: