1) Z-scores are expressed in __sigma_________________ units

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1) Z-scores are expressed in __sigma_________________ units. (1 point)

 

2) ____66_______percentage of the distribution lies within one standard deviation from the mean? (1 point)

 

3) What does a negative Z-score mean? (1 point)

Means the raw score

 

 

4) A researcher has data on starting salaries of recent high school graduates. The mean salary is $27, 654, with standard deviation $4,569. Assuming a normal distribution, find the corresponding Z-scores for the following salaries.  (2 points each)

                     z-score

a)     $35, 456    __________    (this is where I am confused)     27,654-4,569?     z=x-µ/Ó

b)     $23,875     __________

c)     $27,450     __________

5) Using the same data, what percentage of the sample falls below the salary $25,000? (2 points)

 

6) Using the same data, what percentage of the sample falls above the salary $42,750? (2 points)

 

7) Using the same data, what percentage of the sample falls below the salary $30,000? (2 points) (Hint: Be careful with this one. There's an extra step.)