Suppose a study similat to example 11 was performed using two second grade classes. Assume the summary statistics are Sample mean 1= 46.32, Sample mean 2= 32.85, Standard deviation 1= 11.53, Standard deviation 2= 15.33, n1= 26 and n2= 24. Find a 95% confidence interval for the difference between the treatment (Group 1) and the control (Group 2) mean using the second approximation for degrees of freedom. Also write a one-sentence summary of what is confidence interval says about the difference in means.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.