The following table gives the number of students enrolled from 2007 to 2011. If the percentage of average enrollment is the hypothesis, please verify the relationship between the class level (independent or dependent) and year by using Chi square distribution.
You have to calculate expected values, degree of freedom, 95% confidence level and the critical value in Chi square distribution table to confirm your statement.
|
2007
|
2008
|
2009
|
2010
|
2011
|
|
Freshman
|
560
|
495
|
553
|
547
|
512
|
|
Sophomore
|
369
|
385
|
358
|
361
|
393
|
|
Junior
|
209
|
226
|
248
|
268
|
285
|
|
Senior
|
267
|
277
|
304
|
328
|
340
|
|
Unclassified
|
64
|
70
|
93
|
77
|
126
|