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Correlation Discussion...results when the data distribution is one sided. 7. Phi Correlation coefficient: When both variables to be measured are discrete dichotonomies; one uses a Phi coefficient. Although this technique is very useful in certain areas of study; it should only be used when none of the more robust techniques is applicable. There are many circumstances where correlation is used in research. For example; if the researcher wishes to test the relationship between the marks students get in a particular subject and their scores on an ability test; the researcher would use the Pearson Product Moment Correlation Coefficient. If only the relative standing of the students...
1 Pages(250 words)Essay
Correlation Assignment...?Correlation Correlation is one of the most common and important statistical analysis used today. A correlation is a single value that defines the extent of linear relationship between any two variables (Cohen et al. 8). For instance, we might be interested in assessing whether the number of hours students spend watching television is related to their performance in school. In such a case, we will interview a few students selected randomly from the student population regarding their television watching patterns, then compare these values with their GPA scores using appropriate correlation tests. Generally, we expect a negative correlation...
3 Pages(750 words)Essay
Correlation...the benefits of the subsidy.
Correlation between classrooms and student performance
The intention behind connecting classrooms with the latest internet facility is to ensure better performance of the students. In this case the variable A is the number of classrooms connected with internet. The variable B is the performance of the students in the test conducted. The correlations between these two variables are very much relevant because the actual results of the spending are understood by this. A positive correlation means that the classrooms are connected with better internet facilities and the students are provided the most modern internet facilities in the classrooms...
3 Pages(750 words)Essay
The T Test and the Chi-square Test...The T Test and the Chi-square TestT test:
The t-distribution can be used to compare the mean of a sampled population to some fixed, known value. This statistical test of hypothesis is referred to as a "one-sample t-test." This one sample t-test statistic is calculated as follows:
Test statistic: t = (ẋ - µ) / (σ /)
where x represents the mean of the sampled data, µ represents the hypothesized value of this mean, σ represents the hypothesized population standard deviation and n represents the total number of sampled...
5 Pages(1250 words)Article
Correlation Discussion...Correlation Discussion Every correlation determines how two variables depend upon each other. However, there are a variety of methods that are used to work out the correlation of any given data set.
If we had two variables that were used on a ranked scale, then we would likely use Spearmans rank correlation coefficient. A real world example of the use of this method could be the feedback that is gathered about a teacher at the end of the semester. The rating scale would contain a number of variables such as agree, somewhat agree, neutral, somewhat disagree, and disagree. If we were comparing this response to individual students’ grades, then Spearman’s rank...
1 Pages(250 words)Essay
Correlation Discussion..., this may be applied when the value of r (Pearson’s product-moment correlation coefficient) deviates from zero, in which case, the sampling distribution becomes skewed progressively and Fisher’s z-transformation may resolve to normalize this condition. Though the mean and variance do not follow a common transformation, functions pertaining to cumulative distribution and probability density can still be determined statistically via such method. The following graph demonstrates how ‘zr’ varies with ‘r’.
Evaluation of Pearson ‘r’, on the other hand, may indicate correlation between two variables based on tests to figure whether the ‘r’ varies from -1 to +1, with 0 in reference to absence...
1 Pages(250 words)Essay
Correlation...inferences (Riccardo, 2005).
Some of the variables such as those which are related to malnutrition and other cases like age and birth order since they correlational in nature. They require correlational evidence in order to be proven scientifically. Correlation is also very important in statistics since it helps us so much to make predictions since when one is able to understand the score of something one is able to predict more accurately the next score having basis on correlation. Under controlled experimental conditions the evidence that has been gotten from studies that have used correlation one can be able to test the evidence....
1 Pages(250 words)Assignment
Hypothesis and T-test Analysis Problem Set...scores, we click on Analyze menu found at the top of the Data View window and select Compare Means and select Paired-Sample T-test at the dialog box then input our variables and click Ok to produce the Output.
From our analysis, this is our output:
Paired Samples Statistics
Mean
N
Std. Deviation
Std. Error Mean
Pair 1
Stress_40
151.8444
45
14.48346
2.15907
Stress_60
136.8667
45
9.94896
1.48310
Paired Samples Correlations
N
Correlation
Sig.
Pair 1
Stress_40 & Stress_60
45
.037
.810
From the table, it is evident that while the mean for age 40 is 151.8444, that of age 60 is 136.8667which is lower hence we are justified to conclude that overall life stress decreases...
4 Pages(1000 words)Statistics Project
Independent Sample t-test Using SPSS...Independent Sample t-test Using SPSS
Independent t-test compares the means between two sets of unrelated values based on the same dependent variable. For our particular case, 150 students were selected randomly from those taking level 1 business management to participate in an Entrepreneurship Project. The participants were marked on scale of 0-100 and asked to indicate whether they took Business at A-level or any other similar standard before joining university. The primary expectation is that those who had taken Business previously had an advantage in the project.
a.
The independent t-test determines whether unknown means of two...
4 Pages(1500 words)Coursework
Regression Analysis & T-Test...Regression Analysis & T-Test
Part 1:
T-Test
Given the data on radio and newspaper adverts do you think that one form of advertising is more effective than the other? In order to support your answer produce various statistical outputs such as descriptive statistics, graphical summaries, boxplots and perform a t-test for equality of means. Explain and discuss the output and analysis and draw an appropriate conclusion.
Two-sample t-test of equality of means
Descriptive Statistics
Discussion of the output and analysis
The mean expenditure spent on radio advertisements is 7573 while the mean expenditure...
2 Pages(1500 words)Assignment
