In a two-sample t-test, we can compare the mean of two different groups. These two groups can either be related or different from each other. For example, we can use it to compare which sports are the most watched in the US. The formula for the two-sample t-test is as follows: H...
statistician follows a student t-distribution. It is done under the null hypothesis. It can be used to determine whether two sets of data are significantly different from each other or not. And also it is most commonly applied when the test statistic would follow a normal distribution. In thi...
Depending upon the type of distribution the test statistic belongs to, there are different formulas to compute the critical value. The confidence interval or the significance level can be used to determine a critical value. Given below are the different critical value formulas....
Oncet-test statistic valueis determined, you have to read int-test tablethecritical value of Student’s t distributioncorresponding to thesignificance level alphaof your choice (5%). Thedegrees of freedom(df) used in this test are :
Compute Chi-Square Statistic:Use the formula to calculate the chi-square statistic by comparing observed and expected frequencies. Determine Degrees of Freedom:Calculate degrees of freedom using the formula (df = (rows − 1) ✕ (columns − 1)). ...
The Pearson correlation coefficient is a statistic that is used to determine whether or not two variables are related. It is also used to determine the strength of a correlation using values -1.0 to +1.0. Create an account to start this course today ...
The standard deviation of the population to which the unstandardized value belongs. The unstandardized raw value for which you want to compute a Z-score. Z-score: Now that you have calculated a z score, you likely will need to lookup corresponding probability levels in a z score table. To...
Even though there are many computer programs that can easily compute the sum of squares, it is still important to know how to calculate the sum of squares so that the statistician can understand what this statistic means for the data. To find the sum of squares: Calculate the mean (average...
Standard error allows you to build a relationship between a sample statistic (computed from a smaller sample of the population and the population's actual parameter.
The Mean Absolute Deviation (MAD) is a descriptive statistic. Like the Average, it is used to summarize a given data set through one value. The method of calculating the average of two or more numbers is known as Mean. However, average and mean are commonly used interchangeably, as applied...