Search: stastics- correlation and regression

Number of results: 953

stastics- correlation and regression
When x increases by 1, y increases by 1/4. 1 is correct, but if both variables increase, is that a positive or negative correlation?
Tuesday, October 19, 2010 at 1:31am by PsyDAG

stastics- correlation and regression
for the table that follows: answer the following questions: x y 1 -1/4 2 -1/2 3 -3/4 4 ? * would the correlation between x and y in the table show above be positive or negative? i think that it would be negative, i am not sure that is correct? * find the value of y in the ...
Tuesday, October 19, 2010 at 1:31am by mary-please help figure out this problem.

Statistics - Correlation Coefficient/Regression
y = -15.4 + 14.4x the correlation coefficient is correct because it is geomatric mean of two regression coefficient the second regression coefficient is 0.066428.
Saturday, June 21, 2008 at 8:35pm by saqib

STATISTICS
A) If a regression experiment has correlation coefficient r= 0.75, what precent of total variation is explained by the regression? B) if 85% of total variation is explained by the regression, and there is an inverse relationship between y and x, then what is the correlation ...
Sunday, April 17, 2011 at 6:12pm by SROBSON

statistics
If the correlation coefficient is -0.54, what is the sign of the slope of the regression line? - As the correlation coefficient decreases from 0.86 to 0.81, do the points of the scatter plot move toward the regression line, or away from it
Thursday, October 4, 2012 at 11:01am by mom

Math
A. If the correlation coefficient is 0.65, what is the sign of the slope of the regression line? B. As the correlation coefficient decreases from -0.97 to -0.99, do the points of the scatter plot move toward the regression line, or away from it?
Friday, October 21, 2011 at 2:59pm by Jen

college statistics
if the correlation co-efficient is o.32 what is the sign of the slope regression line as the correlation co efficient decreases from 0.78 to 0.71 do the oints of the scatter plot move toward the regression line or away from it
Saturday, May 26, 2012 at 10:19am by melba

correlation and regression
the data given below has y = 3x-5 for its regression equation. find the standard error of estimate
Tuesday, December 4, 2012 at 4:09pm by reta

math
can someone please help me fast before midnight. a)I need the correlation between x and y b)slope of linear regression c)y intercept of linear regression for the points (1,8)(2,6)(3,4)(4,2)(5,5)
Monday, May 5, 2008 at 10:53pm by john

college statistics
construct a scatterplot for x,y values x 1 2 3 4 5 y 0.5 0.0 -0.5-1.0-1.5 what would be the slope of this regression line would the correlation between xand y be postive oe negative how would you interpret these data in terms of regression
Saturday, May 26, 2012 at 3:28pm by melba

Stats
x y 1 -10.0 2 -20.0 3 -30.0 4 -40.0 5 -50.0 - What would be the slope of this regression line? - Would the correlation between x and y be positive or negative? - How would you interpret these data in terms of linear regression?
Tuesday, October 25, 2011 at 8:35pm by Jen

statistics
Selected students means you are dealing with a sample from a population. The best you can do with a sample is to estimate the correlation coefficient of the population, or the correlation coefficient of the sample. See the formulas and examples from: http://stattrek.com/...
Saturday, April 6, 2013 at 5:16pm by MathMate

Statistics
The following linear equation, y = b0 + b1x, is a regression line with y-intercept b0 and slope b1. Define These Terms 1) correlation coefficient 2) Linear regression equation
Thursday, May 19, 2011 at 6:25pm by Leslie

correlation and regression
No data is given.
Tuesday, December 4, 2012 at 4:09pm by MathGuru

Statistics
The correlation is 0.14. The Pearson r is the correlation coefficient and is a measure of correlation, which can be positive or negative. The closer the correlation is to 0, the weaker it is. The closer to +1 or -1, the stronger it is. If you have a correlation of +1 or -1, ...
Saturday, June 27, 2009 at 3:26pm by MathGuru

Stat
1. For the following scores, X Y 1 6 4 1 1 4 1 3 3 1 Sketch a scatter plot and estimate the value of the Pearson correlation. b. Compute the Pearson correlation 2. For the following set of scores, X Y 6 4 3 1 5 0 6 7 4 2 6 4 a. Compute the Pearson correlation. b. Add 2 points ...
Monday, March 4, 2013 at 1:06am by Cole Brown

algebra
c and d look good The correlation coefficient is a number between 0 and 1. If there is no relationship between the predicted values and the actual values the correlation coefficient is 0 or very low (the predicted values are no better than random numbers). As the strength of ...
Monday, January 16, 2012 at 7:53pm by Steve

algebra 1
Enter these data points into some graphing software, and ask the computer to perform a linear regression on the data (find the best-fit line that goes through the data points) The computer should also be able to calculate the correlation coefficient. If the correlation ...
Wednesday, October 24, 2012 at 11:28am by Jennifer

Regression
R square is the coeffecient of determination. Is Multiple R the coefficient of correlation?
Monday, June 13, 2011 at 2:06pm by Thara

statistics
Healthy breakfast contains the rating of 77 cereals and the number of grams of sugar contained in each serving. A simple linear regression model considering "sugar" as the explanatory variable and "rating" as the response variable produced the following ...
Wednesday, September 19, 2012 at 12:17am by Gee

Stats
Construct a scatterplot for the (x, y) values below, and answer the following questions. You do NOT need to submit your scatterplot with your answer; however, show all other work. x y 1 2.5 2 5.0 3 7.5 4 10.0 5 12.5 - What would be the slope of this regression line? - Would ...
Sunday, October 7, 2012 at 9:58am by Anonymous

STATISTICS
The coefficient of determination deals with variation and is a measure of how well any given regression line represents its data. If a regression line passes through every point, all of the variation could be explained. The further the regression line is away from the points, ...
Sunday, April 17, 2011 at 6:12pm by MathGuru

Statistics
http://www.google.com/search?client=safari&rls=en&q=correlation+coefficient+regression&ie=UTF-8&oe=UTF-8
Friday, December 30, 2011 at 12:31am by PsyDAG

Statistics:Correlation and Least Square Regression
Correlation and Least Square Regression A long term study of changing environmental conditions in Chesapeake Bay found the following annual average salinity readings in one location in the bay: Year Salinity (%) 1971 13.4 1972 9.8 1973 15.1 1974 14.7 1975 15.1 1976 14 1977 15....
Tuesday, September 11, 2007 at 4:24pm by Carma

statistics
Given the following scatter diagram , the sample correlation coefficient r: Has a positive linear correlation Has a negative linear correlation. Has little or no correlation. Looks close to + 1.00
Thursday, August 19, 2010 at 6:40pm by Karen

Algebra
2. Find the value of x^3 +2x^2 -3 when x =3 Answer-42 12. What type of correlation would you expect between the number of minutes a candle burns and the height of the candle? a. no correlation b. positive correlation c. negative correlation d. equal correlation Answer-c 13. ...
Sunday, August 7, 2011 at 5:06pm by lizzie

stastics
a car dealer estimates that they sell two cars on average per week. they only have space in their showroom for 4 cars. if stock replacement cannot take place within a week, what is the probability assuming that weekly car sales follow a poisson distribution that, the dealer ...
Friday, April 27, 2007 at 3:51am by mary

math
interpret an r value of -0.82. a)strong negative correlation B)weak negative correlation C)strong positive correlation D)no correlation
Friday, November 13, 2009 at 12:01pm by princess

Statistics
Using the following Minitab output write the straight line (least squares) equation and the correlation coefficient. The regression equation is Sales = 27.2 + 0.252 Exp Predictor Coef SE Coef T P Constant 27.195 5.781 4.70 0.005 Exp 0.2517 0.4201 0.60 0.575 S = 8.97833 R-Sq = ...
Wednesday, March 6, 2013 at 7:06pm by BettieLee

algebra 1
Natalie performs a chemistry experiment where she records the tenperture of an ongoing reaction.The solution is 93.5 C after 3 minutes;90 C after 5 minutes,84.8 C after 9 minutes; 70.2 C after 18 minute; 54.4 C after 30 minutes;42.5 C after 37 minutes; and 24.9 C after 48 ...
Wednesday, October 24, 2012 at 11:28am by Janet

statistics
Make up a scatter diagram with 10 dots for each of the following situations: 1. perfect positive linear correlation, 2. large but not perfect positive linear correlation, 3. small positive linear correlation, 4. large but not perfect negative linear correlation, 5. no ...
Sunday, March 18, 2012 at 11:27pm by Dawm

Economics
Please correct if I have stated the right correlation to the following relationships: a) volume of auto traffic and auto accident rate -> 0 correlation b) pesticide and crop yield -> negative correlation c) consumption and GDP -> positive correlation
Tuesday, January 25, 2011 at 9:45pm by Anonymous

research evaul 342
If the coefficient of correlation is –0.81, then the percentage of the variation in y that is explained by the regression line is 81%. A. True B. False
Tuesday, July 27, 2010 at 12:34am by peter

Statistics
In reagards to correlation and regression how can that be applied to accounting. I am trying to find some websites where i could apply one of the above to accounting.
Wednesday, April 30, 2008 at 8:40pm by Caryn

math
I need a definition for this constant rate of change when graphing in mathematics and for Positive and Negative correlation and also what the pattern is in this a) 1000, 100, 10, 1 I'll give you a definition for positive and negative correlation. Correlation is a linear ...
Wednesday, January 10, 2007 at 5:21pm by austin

statistics
The data set healthy breakfast contains the ratings of 77 cereals and the number of grams of sugar contained in each searving. A simple linear regression model considering Sugar as the explanatory variable and Rating as the response variable produced the following regression ...
Thursday, September 13, 2012 at 1:39am by Gee

Math-Algebra II
How would you interpret the findings of a correlation study that reported a linear correlation coefficient of − 1.34? The only thing I know is that it represents a negative correlation. Please shed any light you can.
Wednesday, January 26, 2011 at 10:25pm by Michelle

Statistics: Calculate a Pearson's r
Once you determine the correlation coefficient from a Pearson's r, square the correlation coefficient to find the Coefficient of Determination. The Coefficient of Determination shows the strength of the relationship between two variables. The ratio of explained variance to...
Tuesday, October 18, 2011 at 3:25pm by MathGuru

Math
Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after ...
Thursday, May 2, 2013 at 1:35am by Brittany

algebra
A linear regression wquation of best best fit between a student's attendance and the degree of success in school is h = .5x + 68.5. The correlation coefficient, r, for these data would be
Monday, December 10, 2012 at 3:56pm by Kyler

Statistics - Correlation Coefficient/Regression
I used an online calculator and came up with this: y = a + bx where: a= -15.4 b= 14.4 r = 0.978 Your formula looks correct. It's easy to make errors with the calculations when doing these kinds of problems.
Saturday, June 21, 2008 at 8:35pm by MathGuru

math
Yes, but some scientists will refer to r^2 as the correlation coefficient while others will refer to r as the correlation coefficient. So, what you should do is take the square root and say something like "the correlation coeffcient is given by r = 0.469". And then ...
Thursday, March 6, 2008 at 5:00pm by Count Iblis

statistics
Pre- study scores versus post- study scores for a class of 120 college freshman english students were considerated. The residual plot for the least squares regression line showed no pattern. The least squares regression line was y^=0.2+0.9x withwith a correlation coefficient r...
Thursday, September 13, 2012 at 2:20am by Gee

Maths
5. Compute the two regression equations on the basis of the following data: X Y Mean 40 45 Standard Deviation 10 9 Given that the coefficient of correlation between X & Y is 0.50. Also estimate the value of Y for X=48?
Saturday, October 9, 2010 at 2:00am by Neeraj Bhanot

math
Construct a scatter plot for the given data. Determine whether there is a positive linear correlation, negative linear correlation, or no linear correlation.
Sunday, December 6, 2009 at 12:18pm by jen

statistics
Job Sat. INTR. EXTR. Benefits 5.2 5.5 6.8 1.4 5.1 5.5 5.5 5.4 5.8 5.2 4.6 6.2 5.5 5.3 5.7 2.3 3.2 4.7 5.6 4.5 5.2 5.5 5.5 5.4 5.1 5.2 4.6 6.2 5.8 5.3 5.7 2.3 5.3 4.7 5.6 4.5 5.9 5.4 5.6 5.4 3.7 6.2 5.5 6.2 5.5 5.2 4.6 6.2 5.8 5.3 5.7 2.3 5.3 4.7 5.6 4.5 5.9 5.4 5.6 5.4 3.7 6.2...
Tuesday, September 21, 2010 at 1:31pm by chris

Statistics and Research Methods
Here are a few hints: The Pearson r is the correlation coefficient and is a measure of correlation, which can be positive or negative. The closer the correlation is to 0, the weaker it is. The closer to +1 or -1, the stronger it is. If you have a correlation of +1 or -1, then ...
Thursday, April 11, 2013 at 7:48pm by MathGuru

Statistics - Correlation Coefficient/Regression
'm having some difficulty with the following question: The following data shows expenditures (in millions of dollars) and case (sales in millions) for 7 major soft drink brands. Calculate the correlation coefficient. Is this significant at the 5% level (ie, α=.05...
Saturday, June 21, 2008 at 8:35pm by Hannah

Statistics
True or False and explain: If the slope of a regression line is large, the correlation between the variables will also be large. I was thinking false but am now second guesing myself. Thanks.
Thursday, April 15, 2010 at 7:47pm by Anonymous

Stats
The scatter diagram of the lengths and widths of the petals of a type of flower is football shaped; the correlation is 0.8. The average petal length is 3.1 cm and the SD is 0.25 cm. The average petal width is 1.8 cm and the SD is 0.2 cm. 1. One of the petals is 0.2 cm wider ...
Thursday, March 28, 2013 at 6:37am by Judy

Math
Jade counted the number of the students on each sports time at her school and the number of wins the team had last season. If she displays her data on a scatter plot, what type of relationship will she most likely see between the number of students on a team and the number of ...
Tuesday, October 18, 2011 at 8:45pm by Please help

Statistics
In conducting multiple regression analyses (MRAs), a major technical concern involves any high correlation of predictor (regressor) variables included in the model. The term for this is ....? A. Redundant predictors B. Close "knit" IVs C. Multicollinearity D. ...
Sunday, September 2, 2012 at 9:03pm by Pat

statistics
the following sample observations were randomly selected: x: 2,5,6,8,9,11,15 y: 22,23,16,18,19,13,12 a)calculate the correlation coefficient, r b) determine the regression equation c) determine the value of Y when X=20
Monday, November 29, 2010 at 10:33am by skitter

Statistics 15.59
Computer database GROWCO describes the characterisitics of 100 companies identified by Fortune as the fastest growing. Two of the variables listed are revenue and net income (millions of dollars) for the most recent four quarters. Determine the linear regression equation ...
Wednesday, June 16, 2010 at 12:16am by Julia Brown

algebra
A linear regression equation of best fit between a student's attendance and the degree of success in school is h = .5x + 68.5. The correlation coefficient, r, for these data would be? 1. <?r<1 2. -1<?r<0 3. r=0 4. r=-1
Monday, December 10, 2012 at 3:59pm by Kyler

statistics
Coefficient of Determination is explained variation divided by total variation (or more simply, the correlation coefficient squared). To find the correlation coefficient, take the square root of .74 for your answer. The Coefficient of Determination shows the strength of the ...
Saturday, January 31, 2009 at 11:53pm by MathGuru

stats - URGENT!!!!
the following sample observations were randomly selected: x: 2,5,6,8,9,11,15 y: 22,23,16,18,19,13,12 a)calculate the correlation coefficient, r b) determine the regression equation c) determine the value of Y when X=20
Tuesday, November 30, 2010 at 3:05pm by skitter

Mth plz...help
A linear regression equation of best fit between a student's attendence and the degree of sucess in school is h = 0.5x + 68.5. the correlation coefficent, r, for these data would be (1) 0 < r < 1 (2) -1< r < 0 (3) r = 0 (4) r = -1
Sunday, September 21, 2008 at 11:12am by Ashlee

Statistics
Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the correlation is +0.57 It ...
Tuesday, December 18, 2012 at 10:56am by Jill

statistics
Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the correlation is +0.57 It ...
Thursday, November 15, 2012 at 10:26am by joey

Stats
For 1): Y(hat) comes from substituting an x value into a regression equation and solving for y(hat). Y(hat) is also called the predicted y value in a regression equation. Let's use an example. Suppose the regression equation is this: y(hat) = 2.75 + .5x If x = 1, then y(...
Tuesday, March 19, 2013 at 10:10pm by MathGuru

Statistics
Using an online calculator: 4 data pairs (x,y): ( 3.00 , 5.00 ); ( 4.00 , 5.00 ); ( 2.00 , 3.00 ); ( 1.00 , 4.00 ); Regression equation: y = 3 + .5x Correlation Coefficient: r = 0.674 Check with your own calculations.
Tuesday, August 28, 2012 at 6:12pm by MathGuru

Statistics
The eggs of a species of bird have an average diameter of 23 mm and an SD of 0.45 mm. The weights of the chicks that hatch from these eggs have an average of 6 grams and an SD of 0.5 grams. The correlation between the two variables is 0.75 and the scatter diagram is roughly ...
Friday, March 15, 2013 at 4:07pm by Kimberly

statistics
Pre study scores versus post-study scores for a class of 120 college freshman english students were considerated. The residual plot for the least squares regression line showed no pattern. The least square regression line was y = 0.2 + 0.9x with a correlation coefficient r = 0...
Tuesday, September 18, 2012 at 11:59pm by Gee

Statistics
For the regression equation, Y=bX+a, which of the following X,Y points will be on the regression line? a, a,b b, b,a c, 0,a d, 0,b
Friday, October 26, 2012 at 3:54am by Robbie

statistics in psychology
11. Make up a scatter diagram with 10 dots for each of the following situations: (a) perfect positive linear correlation, (b) large but not perfect positive linear correlation, (c) small positive linear correlation, (d) large but not perfect negative linear correlation, (e) no...
Monday, July 25, 2011 at 10:25am by desiree

Business Statistics
Given the least squares regression line = -2.88 + 1.77x, and a coefficient of determination of 0.81, the coefficient of correlation is: A) -0.88 B) +0.88 C) +0.90 D) –0.90 I picked C +0.90
Sunday, March 15, 2009 at 7:50pm by Stuart

Math
Positive correlation means both variables increase/decrease together. Negative correlation means one variable increases while the other decreases. What is the consistent difference between the y values to determine the missing value? How good is the predictability of y from x...
Thursday, November 10, 2011 at 7:40pm by PsyDAG

Statistics
A set of X and Y scores has SSx=10, SSY=20, and SP=8, what is the slope for the regression equation? a. 8/10 b. 8/20 c. 10/8 d. 20/8 For the regression equation, Y=bX+a, which of the following X,Y points will be on the regression line? a. a,b b. b,a c. 0, a d. 0, b
Monday, October 22, 2012 at 7:54pm by Robbie

math
Not sure what your are asking, but I will give an answer. 1. positive correlation 2. negative correlation
Wednesday, February 6, 2013 at 5:40am by PsyDAG

Statistics
Of you perceived a linear model, then the coefficient of correlation was .7, a strong correlation.
Monday, August 8, 2011 at 2:48pm by bobpursley

statistic
Explain the concept of correlation and how to interpret correlation coefficients of 0.3,0, and -0.95
Sunday, August 7, 2011 at 9:57am by Toha

statistics
The scatter diagram of the lengths and widths of the petals of a type of flower is football shaped; the correlation is 0.8. The average petal length is 3.1 cm and the SD is 0.25 cm. The average petal width is 1.8 cm and the SD is 0.2 cm. (a)One of the petals is 0.2 cm wider ...
Thursday, March 28, 2013 at 7:59pm by pat

Statistics
How would you interpret the findings of a correlation study that reported a linear correlation coefficient of +0.3?
Wednesday, July 4, 2012 at 7:07pm by Jane

Statistics
Is is possible for the regression equation to have none of the actual (observed) data points located on the regression line?
Sunday, December 2, 2012 at 11:32pm by Julia

Statistics
Determine the regression line of x+2y-5=0 and 3x+3y-8=0 (i) y on x and (ii) x on y, (iii) Find r using the regression coefficients
Monday, September 26, 2011 at 8:43am by Deepti

Statistics
1. Correlation coefficient is number that indicated the degree of linear relationship between two variables. It can vary between -1 and +1. 2. I searched Google under the key words "'linear regression equation'" to get these possible sources: http://www....
Thursday, May 19, 2011 at 6:25pm by PsyDAG

Statistics
How would you interpret the findings of a correlation study that reported a linear correlation coefficient of − 1.34?
Tuesday, October 11, 2011 at 8:21pm by robyn

Statistics
Eggs(x): mean = 23, sd = 0.45 Weights of chicks(y): mean = 6, sd = 0.5 Correlation: r = 0.75 Regression equation is in this format: predicted y = a + bx ...where a = intercept and b = slope. To find the equation, you need to substitute the information given in the problem into...
Friday, March 15, 2013 at 4:07pm by MathGuru

social psy
) Researcher wants to look at the correlation between class attendance and grade in class (higher numbers indicating a higher grade). The researcher found the following result r = .82. The correlation coefficient tells researchers two pieces of information, the strength of the...
Monday, October 3, 2011 at 2:23pm by deb

stats
For positive correlation both variables increase/decrease together. For negative correlation, one variable increases, while the other decreases. If there is a correlation significantly greater than chance, either one variable causes the other or a third variable might be ...
Sunday, April 28, 2013 at 1:43pm by PsyDAG

algebra 1
Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after 37...
Wednesday, May 1, 2013 at 5:45pm by Brittany

math - regression line - thank you
The question states: Plot the regression line from D = 40 to D = 300. My question: Do you extend the line beyond those 2 points (as in going towards the axis) or does the regression line just connect those 2 points like a line segment? Thank you
Thursday, January 31, 2013 at 7:37am by Sejul

Stats
You are given the following data. # of Absences Final Grade 0 96 1 92 2 71 3 66 4 60 5 51 A. Find the correlation coefficient for the data. B. Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
Sunday, October 23, 2011 at 1:04pm by Jennifer

Math
You are given the following data. # of Absences Final Grade 0 96 1 92 2 71 3 66 4 60 5 51 A. Find the correlation coefficient for the data. B. Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
Friday, October 21, 2011 at 3:03pm by Jen

statistic
what type of correlation would you expect to exist between people's height and their shoe size? My answer is a positive correlation.
Thursday, July 12, 2012 at 6:25pm by bria

Statistics
Pre-exam: mean = 275, sd = 26 Final exam: mean = 71, sd = 6 Correlation: r = 0.67 Regression equation is in this format: predicted y = a + bx ...where a = intercept and b = slope. To find the equation, you need to substitute the information given in the problem into a ...
Sunday, February 1, 2009 at 2:45pm by MathGuru

statistics
You are given the following data. Number of Absences Final Grade 0 95 1 91 2 82 3 69 4 67 5 58 - Find the correlation coefficient for the data. - Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
Thursday, October 4, 2012 at 11:05am by mom

PLZ HELP....STATS
You are given the following data. # of Absences Final Grade 0 96 1 92 2 71 3 66 4 60 5 51 A. Find the correlation coefficient for the data. B. Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
Sunday, October 23, 2011 at 11:52pm by Jennifer

Psychology Statistics
2 For a sample of n = 20 individuals, how large a Pearson correlation is necessary to be statistically significant for a two-tailed test with  = .05? 3 The Pearson correlation is calculated for a sample of n = 25 individuals. What value of df should be used to ...
Friday, April 26, 2013 at 8:19am by Chioma

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