A group of 5 statistics students receive the following grades on a

     A group of   5 statistics students receive the following grades on a test: 81, 74, 62, 92,   and 76. An intervention plan is used and the students increased their scores   on a retest to: 85, 79, 75, 95 and 84. At the 0.05 significance level, is the   intervention plan helpful in increasing the grades?    

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