At the 05 significance level can we conclude the contaminati

At the .05 significance level, can we conclude the contamination measurements are lower after use of the new soap? The following data on annual rates of return were collected from five randomly selected stocks listed on the New York Stock Exchange (\"the big board\") and five randomly selected stocks listed on NASDAQ. Assume the population standard deviations are the same. At the .10 significance level, can we conclude that the annual rates of return are higher on the big board?

Solution

According to given   table

The observed value of the test statistic for testing the null hypothesis : 0.5 o H p =
versus the alternative hypothesis : 0.5 a H p ¹ is: 1.80