b) Describe the distribution of quiz scores for individuals claiming to have HSA
ID: 3067791 • Letter: B
Question
b) Describe the distribution of quiz scores for individuals claiming to have HSAM.
Some individuals have the ability to recall accurately vast amount of 3 autobiological information without mnemonic tricks or extra practice. This ability is called HSAM, for Highly Superior Autobiological Memory. A research team administered a quiz on past public events to 115 individuals claiming to have HSAM. The histogram in Figure below shows the distribution of scores on this quiz, expressed in percent of correct answers Potential HSAM 0 20 30 40 50 70 Percent correct on public events quiz Control group 0 20 30 40 50 70 Percent correct on public events quiz 1 Histogram of scores on a quiz of past public events (a) for 115 individuals claiming to have HSAM and (b) for 30 control individuals (people do not claim having HSAM) (a) (2points) Describe the distribution of quiz scores for individuals who do not claim to have HSAMExplanation / Answer
(a) The distribution of quiz scores for individuals claiming to have HSAM is bimodal: with a hish score of (i) around 15 Individuals quizzed with Percent correct on public events quiz on the lower side of around 15% and also (ii) around 15 Individuals quizzed with Percent correct on public events quiz on the high side of around 45 %.
The conclusion is: The distribution of quiz scores for individuals who claim to have HSAM is not normal distribution. It has high values on both sides. i.e., there are considerable individuals with very low scores and there are considerable individuals with vary high scores. Thus, the scores are having a large variation.
(b) The dtstribution of quiz scores for individuals who do not claim to have HSAM is Positively Skewed, also called right skewed. The right tail is longer. Mean is to the right of the peak.
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