Suppose test scores can range from 0 to 200 and follow an (approximately) Normal distribution with mean 115 and standard deviation o = 25. Ho: u = 120 and the alternative Ha: u# 120. A class of 30 students had a mean score of 117. a. What is the value of the test statistic z? b. What is the P-value? c. Would you reject or fail to reject the null at the 5% significance level? Why?

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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.