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The Wechsler Adult Intelligence Scale (WAIS) is a common “IQ test” for adults. The distribution of...

The Wechsler Adult Intelligence Scale (WAIS) is a common “IQ test” for adults. The distribution of WAIS scores for persons over 16 years of age is approximately normal with mean 100 and standard deviation 15.

You wish to determine the probability that a randomly chosen individual has a WAIS score of 105 or higher. To do this, you first need to standardise to a Z-score.

  1. You now sample 60 people at random. State whether the following is true or false:

    The mean for the sampling distribution average is also 100.

    True

    False  

QUESTION 4

  1. Continuing from Question 1. For the sample of 60 people. What is the standard deviation of the sampling distribution average? (Answer to three decimal places)

QUESTION 5

  1. What is the probability that the average WAIS score of a random sample of 60 people is 105 or higher? (leave answer as a decimal to 4 places)

math   Statistics-And-Probability   
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