Find the standard deviation for the following salary data:

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Quiz 1

1. Find the standard deviation for the following salary data:

2010 —————- 30,196?
2009 —————- 30,862?
2008 —————- 34,172?
2007 —————- 37,435?
2006 —————- 38,648?
2005 —————- 39,252?
2004 —————- 38,444?
2003 —————- 38, 477?
2002 —————- 37,491?
2001 —————- 37, 862?
2000 —————- 37,526

2. Find the 68% standard deviation for the above data from question 1.

3. Find the mean for 2005-2009 (group a). Find the mean for 2000-2004 (group b).

4. Which mean is higher (group a or group b) from question 3?

5. Find the average unemployment number with the data below:

sept 12′  — 12,088,000
aug 12′  — 12,544,000
jul 12′  — 12,794,000
jun 12′  — 12,749,000
may 12′  — 12,720,000
apr 12′  — 12,500,000
mar 12′  — 12,673,000
feb 12′  — 12,806,000
jan 12′  — 12,758,000
dec 11′  — 13,097,000
nov 11′  — 13,323,000
oct 11′  — 13,759,000

6. This symbol ( represents
a) subtraction
b) mean
c) mode
d) summation
e) none of the above

7. Find the five number summary for Avg. High Temperature:
Average high and Low Temperatures for Fairbanks Alaska 2012   Avg. High Avg. Low January 3 F -11 F February 11 F -7 F March 25 F 2 F April 44 F 21 F May 61 F 36 F June 71 F 48 F July 72 F 51 F August 66 F 45 F September 54 F 34 F October 32 F 16 F November 12 F -2 F December 7 F -8 F
Min –
Q1 –
Q2 –
Q3 –
Max –

8. Sam has just finished reading in his textbook about the study of grades earned in introductory courses at UMUC. He sees that the mean grade for psychology is 2.71, whereas the mean grade in political science is 3.10. Based on this information he decides to switch his major to political science, where he feels it will be more likely he could receive an A in his courses. Do you think Sam’s decision is appropriate based on these data?