statistics check

posted by .

The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The results were as follows. (Give your answers correct to two decimal places.)

x 7 10 19 9 20 22 6 13 18 15
y 29 27 28 33 24 15 25 23 21 18

(a) Find the equation of the line of best fit.
y hat = -0.56 + 1.78 x

(b) Find se2.
36.00

  • statistics check -

    Y hat = -.57x + 32.20

  • statistics check -

    So what did I do wrong on the part b? That one is wrong also.

  • statistics check -

    What Do you mean se2

  • statistics check -

    What Do you mean by this se2

  • statistics check -

    I am sorry that is Se squared. That is the way it is written on the test.

  • statistics check -

    SE² is given by:
    [ Σ(y-yBar)^2 - [Σ(x-xBar)(y-yBar)]²/Σ(x-xBar)² ] /(n-2)

    I get:
    Σ(y-yBar)²=258.1
    Σ(x-xBar)(y-yBar) = -168.7
    Σ(x-xBar)²=296.9
    n=10
    to get
    se²=20.28

  • statistics check -

    I have a question where did you get 258.1. I must of had my numbers wrong, because I had those other two.

  • statistics check -

    I got it from summing (y-yBar)^2, and I had yBar=24.3.

  • statistics check -

    Ok, thank you, I had the wrong numbers for the yBar

  • statistics check :) -

    You're welcome!

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    On a test whose distribution is approximately normal with a mean of 50 and a standard deviation of 10, the results for three students were reported as follows: Student Opie has a T-score of 60. Student Paul has a z-score of -1.00. …
  2. Stasistic

    On a test whose distribution is approximately normal with a mean of 50 and a standard deviation of 10, the results for three students were reported as follows: Student Opie has a T-score of 60. Student Paul has a z-score of -1.00. …
  3. Statistics

    I bemieve the t test is paired , want to make usre beofre I run the stats. A researcher wanted to answer the following question: What is the difference in students' computer anxiety based on whether or not they own computers?
  4. statistics

    The scatter diagram of midterm scores and final scores in a large class is football shaped. For about 80% of the students, the regression estimate of final score based on midterm score is correct to within 15 points. For about 95% …
  5. math

    The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The results were as follows. (Give your answers correct …
  6. Math check

    Consider a normal population with ì = 49 and ó = 6. Calculate the z-score for an x of 44.2 from a sample of size 22. (Give your answer correct to two decimal places.) 44.2-49/6/22^=.00165=.00
  7. statistics check

    Consider the following bivariate data. Point A B C D E F G H I J x 3 4 2 1 7 2 1 0 4 2 y 1 7 3 3 6 6 5 0 6 2 (b) Calculate the covariance. (Give your answer correct to two decimal places.) 5.35 was my answer . (c) Calculate sx and …
  8. statistics

    The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The results were as follows. (Give your answers correct …
  9. Statistics

    I already found part A just need help with B! The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The results …
  10. Computer science

    Score 1,Score 2 and Score 3 are the marks scored by a student in three tests. Write a pseudocode,an algorithm and draw the flowchart to find the average of best two scores.

More Similar Questions