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

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Basic Math

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

Answer & Explanation Solved by verified expert
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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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