Scores on a scholastic aptitude test are normally distributed with standard deviation

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Scores on a scholastic aptitude test are normally distributed with standard deviation σ=100 points. A group of 25 inner city high school students takes the test; their mean scores is x-bar = 440 points. A researcher believes that the mean scores for the population of all such students is less than 500. State Ho and Ha for a test of this claim. Is the sample result statistically significant at the 1% level?

  • 7 years ago
Scores on a scholastic aptitude test are normally distributed with standard deviation
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