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Change each rat’s score to its z-score equivalent On which diet did the rat score in the highest position? On which diet did the rats score in the lowest position?

Change each rat’s score to its z-score equivalent On which diet did the rat score in the highest position? On which diet did the rats score in the lowest position?

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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  1. A psychologist would like to examine the effects of diet on intelligence.  Two groups of rats are selected, with 12 rats in each group.  One group is fed the regular diet of RAT CHOW, whereas the second group has their diet enhanced by the addition of special vitamins.  After 6 months, each rat is tested on a discrimination task.  The psychologist records the number of errors made by each rat before it solves the problem. The data from this experiment is as follows: 

    Diet

    µ

    σ

    Score

    Regular diet

    11.58

    1.9

    12

    Special

    8.25

    1.35

    15

     

      1. Change each rat’s score to its z-score equivalent
      2. On which diet did the rat score in the highest position?
      3. On which diet did the rats score in the lowest position?
      4. What is the percentile rank of the rat’s error on a special?
      5. What percentage of the rats who had the regular diet scored higher than the score?
      6. Between what two scores on special diet did the middle 95% of rats lie?
      7. What percent of rats had scores between X = 9 and X = 17 on regular?
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