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Question: Should I use a one-tailed or a two-tailed z-test Scenario:

Question: Should I use a one-tailed or a two-tailed z-test

Scenario: Lucy wants to know her fourth grade daughter, Monica, scored on a test of reading comprehension compared to the population of other fourth graders in the school district. Luckily Lucy has taken this course and knows that z-scores will help her understand Monica’s reading score in relation to the population.

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data as follows:

-Monica’s reading comprehension score = 121

-Mean Fourth grade reading comprehension score = 147

  • Standard Deviation of the fourth grade’s reading comprehension = 14.8

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