Share
Explore BrainMass

Correlation

What does a coefficient of correlation of .70 mean?

What does a coefficient of correlation of .70 mean? a. Almost no correlation because .70 is close to 1.0 b. 70% of the variation in one variable is explained by the other variable c. Coefficient of determination is 0.49 d. Coefficient of nondetermination is 0.30 e. None of the above

Statistics: Correlational Research

Share the practical applications of the study (male=120 and female =168). How would the results of this survey be used in the workplace .Briefly describe correlational research .Name a variable from this study and one from the workplace that might prove to provide a correlational relationship and explain why you would choose the

Correlation and causation

These questions are addressed to a specific study and database which I am not including in order to prevent the apperance of asking for assignment completion however it is worth mentioning that the study is one about job satisfaction and the variables involved are age, gender, tenure and department and the units of measure are o

Correlation Coeffcient

Sabin Motorcycle Works plans to develop a brochure for its new revolutionary X2B cycle. One of the facets to be explored and reported on is the speed-mileage question: Is there a linear relationship between the cycle's speed and miles per gallon? Tests on their track revealed the following: Constant speed

Correlation or relationships

The quality control department at Food Town Inc, a grocery chain in upstate New york, conducts a monthly check on the comparison of scanned prices to posted prices. The chart below summarizes the results of a sample of 500 items last month. Company management would like to know whether there is any relationship between error rat

Significance for Correlations

In both cases, give a number of data points, n, and a correlation coefficient, r. Draw a number of data points, n, and a correlation coefficient, r. Tell whether the correlation is significant at 0.05 or 0.01 level, explain. n=50 points, r=0.35. n=20 points, r=0.58.

Critical values for testing correlation (r^2)

1. The IQ scores of 30 children from under-privileged households, were measured before and a year after, a program of nutritional supplementation was instigated at a primary school. Use a two-tailed test. Is there an effect of nutritional supplementation? Submit your answers on a standard answer sheet. (e) Given a (alpha)

Restricting a range is considered.

Suppose you find a restriction in your study of IQ scores and school achievement at a selective private school. Restricting the range is likely to do what to the correlation coefficient? a. Increase the size b. Underestimate the strength c. Have no effect d. Change the sign

Statistics

The product development team at Piggybank is wondering if there is a correlation between retail online sales and total retail sales. Use the Discussion Board to work with the peer/mentor group to calculate the correlation between online and total retail sales, and interpret the results. Share examples and insights. Give two

Variables

The following computer printout of a correlation table was obtanied. It show a correlation table dealing with the correlation of annual rainfall and other variables. PEARSON CORRELATION COEFFICENT/PROB>/R?UNDER HO:RHO=O/N=100 Variable A .7504 .0003 Variable B -.6337 .0060 Variab

Spearman's rho

Hello, I need to find out the Spearman's correlation coefficient of the attached data, I have analysed it using an Excel macro and come up with a different result from when I worked it out manually, using forumlas I found on the web. I'm having trouble deciding which method is the right one, so I'd like someone to take my

Vernon Music Store

The problem is: Vernon wants to use excel to compute autocorrelation coefficients and correlogram for the data presented. This example was manually copied from the book and formulas were not entered. I need assistance in writing a memo BRIEFLY EXPLAINING the results of the attached example (findings, I.E., GRAPH, LAG, ACF, COR

Bivariate data sets

Below are four bivariate data sets and the scatter plot for each. (Note that each scatter plot is displayed on the same scale.) Each data set is made up of sample values drawn from a population. Figure 1 x y 1.0 7.7 2.0 8.7 3.0 6.9 4.0 5.7 5.0 8.5 6.0 4.9 7.0 4.5 8.0 7.3 9.0 5.9 10.0 3.8

Four bivariate data sets

See attached file for full problem description. --- Below are four bivariate data sets. Each data set is made up of sample values drawn from a population. x y = Figure 1 --- --- 1.0 8.2 2.0 6.6 3.0 7.6 4.0 5.7 5.0 7.0 6.0 5.0 7.0 4.8 8.0 3.8 9.0 4.2 10.0 2.8 u v = F

SPSS/compute expected utility/compute correlation matrix

Please see the attached file for full problem description. --- 1. A respondent was presented 18 hypothetical alternatives or profiles described on five attributes of carpet cleaner. The attributes are: o package design (described on three levels) o brand name (described on three levels) o price (described on three leve

Bivariate data

Below are four bivariate data sets. Each data set is made up of sample values drawn from a population. x y = Figure 1 --- --- 1.0 8.1 2.0 7.2 3.0 8.1 4.0 5.9 5.0 6.9 6.0 4.5 7.0 5.0 8.0 3.3 9.0 4.2 10.0 2.7 u v = Figure 2 --- --- 1.0 7.9 2.0 5.3 3.0 10.2

For which data set is the sample correlation coefficient r equal to -1? Which data set has an apparent positive, but not perfect, linear relationship between its two variables? Which data set indicated the strongest negative linear relationship between its two variables? For which data set is the sample correlation coefficient r closest to 0?

Below are four bivariate data sets. (Note that each scatter plot is displayed on the same scale.) Each data set is made up of sample values drawn from a population. x y = Figure 1 --- --- 1.0 8.0 2.0 4.8 3.0 9.8 4.0 6.2 5.0 2.0 6.0 4.8 7.0 8.9 8.0 4.0 9.0 9.7 10.0 6.7 u v

Important Information About Bivariate Data Sets

Below are four bivariate data sets. (Note that each scatter plot is displayed on the same scale.) Each data set is made up of sample values drawn from a population. x y = Figure 1 --- --- 1.0 4.0 2.0 6.3 3.0 7.2 4.0 4.3 5.0 5.1 6.0 7.5 7.0 5.3 8.0 7.0 9.0 8.7 10.0 7.0 u v

Bivariate data

The Cadet is a popular model of sport utility vehicle, known for its relatively high resale value. The bivariate data given below were taken from a sample of sixteen Cadets, each bought "new" two years ago and each sold "used" within the past month. For each Cadet in the sample, we have listed both the mileage, (in thousands of

Bivariate data

Below are bivariate data giving birthrate and life expectancy information for each of twelve countries. For each of the countries, both the number of births per one thousand people in the population and the female life expectancy (in years) are given. Also given are the products of the birthrates and female life expectancies f

Managers of an outdoor coffee stand in Coast City...

Managers of an outdoor coffee stand in Coast City are examining the relationship between (hot) coffee sales and daily temperature, hoping to be able to predict a day's total coffee sales from the maximum temperature that day. The bivariate data values for the coffee sales (denoted by , in dollars) and the maximum temperature (d

Statistics Question

A calculus teacher wants to find out if her class's test scores are correlated to their overall grade point average. The data of the student's test scores and their corresponding grade point averages are found in the table below. Calculate the correlation coefficient. Test score 98 105 100 100 106 95 116 112 _

Statistics Question

What will the correlation coefficient be close to if a strong negative relationship exists? a. +1 b. -1 c. 0 d. .5