Math \ Algebra
posted by Wendy .
Hello! Can you check my answers for these questions? Thank you in advance (=
1. The following ordered pairs give the scores on two consecutive 15point quizzes for a class of 18 students.
(7, 13), (9, 7), (14, 14), (15, 15), (10, 15), (9, 7), (14, 11), (14, 15), (8, 10), (9, 10), (15, 9), (10, 11), (11, 14), (7, 14), (11, 10), (14, 11), (10, 15), (9, 6)
Create a scatter plot of the data. What kind of correlation does the data appear to have?
A. Positive correlation
B. Negative correlation
C. No correlation
D. None of the above
Answer: C
2. Use the regression feature of a graphing utility to find a linear model for the data below. Let t represent the year with t = 9 corresponding to 1999.
Year:Avg length (L) in minutes:
19992.38
20002.56
20012.74
20022.73
20032.87
20043.05
Which of the following shows the equations of the least squares regression line?
A. L = 7.82t  9.78
B. L = 7.82t  17.78
C. L = 0.12t + 2.29
D. L = 0.12t + 1.32
Answer: C
3. Using the same graph presented in the previous question, find the least squares regression line of the data below using the regression feature of a graphing utility. Then, find the average lengths of cellular calls for the year 2013.
A. 242.88 minutes
B. 4.08 minutes
C. 3.48 minutes
D. 3.97 minutes
Answer: B
4. Using the same graph again, find the least squares regression line of the data below using the regression feature of a graphing utility. Then, find the correlation coefficient for the regression line. Round to four decimal places.
A. 0.9766
B. 0.9537
C. 0.971
D. 0.6547
Answer: C
Respond to this Question
Similar Questions

PreAlgebra
Can someone please help me answer these two questions? 
Algebra
Hello, can someone check my answers to the following Algebra questions 1. (2y)(2)= My answer  2 * 2 = 0 Translate 2 and 3 into an euation 2. Four less than the quotient of x divided by 2 is 8. My answer  (x * 2) 4 = 8 3. The sum … 
Math
An instructor gives regular 20point quizzes and 100point exams in a mathematics course. Average scores for six students, given as ordered pairs (x,y) where x is the average quiz score and y is the average test score, are (18, 87), … 
math
a student's 10 scores on 10point class quizzes include a 6, a7, a4, five 9s, an 8, and a 10. The student claims that her average grade on quizze is 9 because most of her scores are 9s. 
Algebra 1
"Graph each system of linear inequalities. Give two ordered pairs that are solutions and two that are not solutions." How do I find these solutions in order to "give two ordered pairs that are solutions and two that are not solutions."? 
Math
Hello! Can you check my answers for these questions? 
Math
Hello! Can you check my answers for these 4 worksheet questions? 
College Algebra
give the domain and the range for the following set of ordered pairs and determine if the ordered pairs represent a function. A) (1,2)(3,4)(5,5)(4,4)(5,4) B) (4,1)(5,1)(6,1)(7,1)(8,1) 
algebra
Here are the scores of 13 students on an algebra test. 55 , 57 , 60 , 60 , 65 , 68 , 70 , 70 , 80 , 80 , 84 , 89 , 92 Notice that the scores are ordered from least to greatest. Give the fivenumber summary and the interquartile range … 
Algebra
Josie must have at least 320 points in her math class to get a B. She needs a B or better to maintain her GPA so she can play an the basketball team. The grade is based on four 50point tests, three 20point quizzes, two 20 point projects, …