Mathematics, 18.03.2022 14:00 laqu33n021
A health research institute collects information from 20 individuals on the number of years they have spent smoking cigarettes, and their age of death. The data is summarized below:
∑x=1257
∑y^2=836
∑x^2=98823
∑y=116
∑(xy)=8249
Find the correlation coefficient (r):
Answers: 3
![r = \frac{n(\sum xy) - \sum x \sum y}{\sqrt{[n \sum x^2 - (\sum x)^2][n\sum y^2 - (\sum y)^2}}](/tpl/images/2699/4946/2fe21.png)
![r = \frac{20 *8249 - 1257* 116}{\sqrt{[20 * 98823 - 1257^2][20 * 836 - 116^2}}](/tpl/images/2699/4946/f3a59.png)
![r = \frac{20 *8249 - 1257* 116}{\sqrt{[20 * 98823 - 1580049][20 * 836 - 13456}}](/tpl/images/2699/4946/d4f12.png)
![r = \frac{164980 - 145812}{\sqrt{[1976460 - 1580049][16720 - 13456}}](/tpl/images/2699/4946/ad5f2.png)
Another question on Mathematics
Mathematics, 21.06.2019 14:20
Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.
Answers: 1
Mathematics, 21.06.2019 19:00
Zroms according to the synthetic division below, which of the following statements are true? check all that apply. 352 -2 6 -12 12 2 4 0 i a. (x-3) is a factor of 2x2 - 2x - 12. b. the number 3 is a root of f(x) = 2x2 - 2x - 12. c. (2x2 - 2x - 12) = (x + 3) = (2x + 4) d. (2x2 - 2x-12) - (x-3) = (2x + 4) e. (x+3) is a factor of 2x2 - 2x - 12. o f. the number -3 is a root of fx) = 2x2 - 2x - 12. previous
Answers: 2
Mathematics, 21.06.2019 19:00
What is the expression in factored form? -20x^2 - 12x a. 4x(5x+3) b. -4x(5x-3) c. -4(5x+3) d. -4x(5x+3)
Answers: 2
You know the right answer?
A health research institute collects information from 20 individuals on the number of years they hav...
Questions
English, 15.12.2021 01:00
English, 15.12.2021 01:00
Biology, 15.12.2021 01:00
Computers and Technology, 15.12.2021 01:00
Computers and Technology, 15.12.2021 01:00
Mathematics, 15.12.2021 01:00
Mathematics, 15.12.2021 01:00
History, 15.12.2021 01:00
Chemistry, 15.12.2021 01:00
