Friday

September 19, 2014

September 19, 2014

Posted by **tracy12** on Tuesday, June 25, 2013 at 10:50am.

(18, 12), (29, 48), (65, 29), (82, 24), (115, 56), (124, 13)

(a) Calculate the covariance of the set of data. (Give your answer correct to two decimal places.)

Incorrect: Your answer is incorrect. .

(b) Calculate the standard deviation of the six x-values and the standard deviation of the six y-values. (Give your answers correct to three decimal places.)

sx =

sy =

(c) Calculate r, the coefficient of linear correlation, for the data in part (a). (Give your answer correct to two decimal places.)

- math -
**Kuai**, Tuesday, June 25, 2013 at 10:01pma.

dbar = 433/6

var(x) = x^2/n -xbar^2

var(x) = 40715/6 -(433/6)^2 = 1577.81

ybar = 182/6

var(y) = y^2 -ybar^2

var(y) = 7170/6 -(182/6)^2 = 274.89

cov(xy) = (xy)/n -(xbar)(ybar)

cov(xy) = 13513/6 -(433/6)(182/6) = 63.11

b.

sx = 43.51

sy = 18.16

C. r = cov(xy/sqrt(var(x)sqrt(var(y))

r = 63.11/sqrt(1577.81)sqrt(274.89) = 0.0958

r = 0.10

**Answer this Question**

**Related Questions**

math - Consider the following set of data. (18, 12), (29, 48), (65, 29), (82, 24...

statistics - Consider the following set of data. (18, 12), (29, 48), (65, 29), (...

STATISTICS(NEED HELP PLEASE?) - Consider the following set of data. (25, 6), (25...

math - 4. For Questions 4-7, use the following data: The number of file ...

Math - The stem-and-leaf plot shows the heights in centimeters of Teddy Bear ...

Statistics - I you are told that a data set has a mean of 25 and a variance of 0...

math - The following is a set of data from a sample of n = 5: 7 4 9 8 The ...

Math - Consider the following data set: 27,49,15,43,35,57,13,73,23,31,32,41,61, ...

Math ~ Check Answers ~ - 3. In the following list of data, find the range: 21, ...

Math ~ Check Answers ~ASAP - 3. In the following list of data, find the range: ...