Montarello and Martins (2005) found that fifth grade students completed more mathematics problems correctly when simple...

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Montarello and Martins (2005) found that fifth grade studentscompleted more mathematics problems correctly when simple problemswere mixed in with their regular math assignments. To furtherexplore this phenomenon, suppose that a researcher selects astandardized mathematics achievement test that produces a normaldistribution of scores with a mean of µ= 100 and a standarddeviation of ? = 18. The researcher modifies the test by insertinga set of very easy problems among the standardized questions andgives the modified test to a sample of n = 36 students. Ifthe average test score for the sample is M = 104, is thisresult sufficient to conclude that inserting the easy questionsimproves student performance? Use a one-tailed test with ?= .01.
A)The alternative hypotheses in words is
B)The null hypothesis in symbols is
C)The critical z values is
D)The z-score statistic is:
E) Your decision is

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SolutionGiven A standardized mathematics achievement test that producesa normal distribution of scores with a mean of 100 and astandard deviation of 18We have to test if there is sufficient evidence to conclude thatinserting the easy questions improves See Answer

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