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Which of the following relationships represents a no correlation between two variables?  

A. As a student’s class attendance decreases, the student’s overall grade remains the same

B. As the number of hours a person exercises decreases, the weight of that person increases

C. As the number of miles driven increases, the amount of the gasoline in the tank decreases

D. As the amount of water plant receives increases, the growth rate of the plant increase.

Answer Explanation:

Correlation of two variables falls into:

Positive correlation: an increase in one variable causes another variable to increase

Negative correlation: an increase in one variable causes another one to decrease

No correlation: a change in one variable does not cause any response in another variable.

From the given choices

Option a is no correlation

Option b is a negative correlation

Option c is a negative correlation

Option d is a positive correlation

Thus, the correct statement is a.

Therefore, the Correct Answer is A.

More Questions on TEAS 7 Math

  • Q #1: "Twelve less than thrice a number." Which of the following translates the phrase above into a mathematical expression?

    A. 3x-12

    B. 12-3x

    C. 3-12x

    D. 12x-3

    Answer Explanation

    We convert the given word problem into a mathematical expression.

    Let the number be x.

    Thrice a number = 3x

    Twelve less than thrice a number = 3x-12

    Thus, the required mathematical expression is 3x-12

  • Q #2: A sweater that normally sells for $78 is marked 15% off. Which of the following estimates the sale price of the sweater?

    A. $12

    B. $66

    C. $22

    D. $69

    Answer Explanation

     we are to find the selling price of the sweater from the marked price and the discount. The marked price is given as

    Discount=mark off rate*original price

    Discount=15%*$78

    Convert 15% into a fraction, which become 15/100=0.15. Then

    Discount=0.15*$78=$11.70

    The selling price of the sweater will be the original price less the discount or mark off value. Then,

    Thus, the approximate selling price of the sweater is $66.

  • Q #3: An athlete runs 5 miles in 25 minutes and then changes their pace to run the next 3 miles in 15 minutes. Overall, what is the average time in minutes it takes the athlete to run 1 mile?

    A. 7 minutes

    B. 5 minutes

    C. 6.5 minutes

    D. 8.5 minutes

    Answer Explanation

    to find the average time the athlete runs in 1 mile, find total time divided by total distance covered in the two runs.

    Total distance=5+3=8 miles

    Total time=25+15=40 minutes

    We now know that the athlete runs 8 miles in 40 minutes, so the time the athlete will run in 1 mile will be:  

                              

    In 5 minutes, the athlete runs 1 mile.