Amath teacher claims that she has developed a review course that increases the scores of students on the math portion of a college entrance exam. based on data from the administrator of the exam, scores are normally distributed with mu equals516. the teacher obtains a random sample of 2000 students, puts them through the review class, and finds that the mean math score of the 2000 students is 521 with a standard deviation of 111. complete parts (a) through (d) below. a) state the null and alternative hypothesis. let u be the mean score.

Null hypothesis :

Alternate hypothesis :

Step-by-step explanation:

Given :

To Find :  State the null and alternative hypothesis.

Solution:

We are given that A math teacher claims that she has developed a review course that increases the scores of students on the math portion of a college entrance exam.

So, claim is increase in he scores of students on the math portion of a college entrance exam.

So,

Null hypothesis :

Alternate hypothesis :

no one knows lol

step-by-step explanation:

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.