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  3. a population has a mean of 40 and a standard devia

A population has a mean of 40 and a standard deviation of 10. Find the z-scores...

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Basic Math

  1. A population has a mean of 40 and a standard deviation of 10.Find the z-scores corresponding to each of thefollowing raw scores:

  1. 60.00

  1. 32.46

  1. A population has a mean of 3 and a standard deviation of 3.Turn the following z scores into raw scores:

  1. Z score: 1.75

  1. Z score: -2.35

  1. For the z-scores below, find the percentile rank (percent ofindividuals scoring below):

  1. 2

  1. -0.5
  1. First graders in the state of Virginia get an average score of20 on a reading test (higher score reflect higher levels ofperformance). A teacher is using a new method to teach reading. Shepredicts that by the end of the first grade, students getting hernew method will have significantly higher scores on reading thanthose in the population. The mean score of the 25 students in herclass is 23.2 and the standard deviation of the population is4.7.

  1. State the null and alternative hypotheses.
  1. Calculate the z-score.

Answer & Explanation Solved by verified expert
4.5 Ratings (1093 Votes)
1Population Mean 40Standard Deviation 10a When X 60Z X 60 40 10 2b When X 3246Z X 3246 40 10 07542 Population Mean 3Standard Deviation 3a Z score 175Raw score X Z 17533 825b Z score 235Raw score X Z 2353 3 4053 a The percentile rank    See Answer
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