Directions: Solve the following problems using excel and data analysis. State your inferential questions and null hypothesis, then test your null hypothesis using 0.05 level of significance. Base on your findings, make a conclusion.

1.The data below represent the number of hours of pain relief provided by two brands of headache tablets administered to 24 subjects. These subjects were randomly divided into two groups and each group was treated with a different brand.

Brand X1Brand X2

106

164

142

68

810

1612

1414

106

1210

148

104

106