State average at the 5-percent level of significance

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Suppose you are interested in determining whether Ms. Kim's third grade class of 25 students did statistically better than the state average on the state proficiency exam. The state exam has a population mean of 500 and a population standard deviation of 75. The students in Ms. Kim's class posted an average score of 527 points. You can conclude that:

*A. Ms. Kim's class performed better than the state average at both the 10-percent and 5-percent levels of significance.

  1. Ms. Kim's class did not perform better than the state average at both the 10- percent and 5-percent levels of significance.
  2. Ms. Kim's class performed better than the state average at the 10-percent level of significance, but not at the 5-percent level of significance.
  3. Ms. Kim's class performed better than the state average at the 5-percent level of significance, but not at the 10-percent level of significance. 

I know that the z-value I get from test statistic is 1.8

Reference no: EM131866218

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