STA 2023  Quiz 1
/ Summer A 2011
May 18th, 2011
There will NOT be any partial credit for the multiple choice questions.
Good
luck!
Name:
UFID:
Each question is worth the same.
1. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15.
What percent of people have an IQ of 130 or greater?
2. Suppose X represents the money paid in dollars for a hotdog. What type of variable
is X?
3. Suppose the variance of the variable X from question 2 is 0.45. What is the standard
deviation of X?
1
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4. Which of the following must be true if the standard deviation of a dataset is equal to
0?
5. Calculate the IQR of the following dataset:
2
5
7
8
11
6. Using the dataset from problem 5, how large would an observation have to be for that
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 Spring '08
 Ripol
 Statistics, Normal Distribution, Standard Deviation, unit increase, following dataset

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