1) Researchers watched groups of dolphins off the coast of Ireland in 1998 to determine what activities the dolphins partake in at certain times of...
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1) Researchers watched groups of dolphins off the coast of Ireland in 1998 to determine what activities the

dolphins partake in at certain times of the day ("Activities of dolphin," 2013). The numbers in table #11.1.6 represent the number of groups of dolphins that were partaking in an activity at certain times of days. Is there enough evidence to show that the activity and the time period are independent for dolphins? Test at the 1% level.

Activity Morning Noon Afternoon Evening Row total

Travel 6 6 14 13 39

Feed 28 4 0 56 88

Social 38 5 9 10 62

Column Total 72 15 23 79 189


2)A person's educational attainment and age group was collected by the U.S. Census Bureau in 1984 to see if age group and educational attainment are related. The counts in thousands are in table #11.1.8 ("Education by age," 2013). Do the data show that educational attainment and age are independent? Test at the 5% level.

Table #11.1.8: Educational Attainment and Age Group

age group Row Total

 Education 25-34 35-44 45-54 55-64 >64

Did not complete HS 5416 5030 5777 7606 13746 37575

Competed HS 16431 1855 9435 8795 7558 44074

College 1-3 years 8555 5576 3124 2524 2503 22282

College 4 or more years 9771 7596 3904 3109 2483 26863

Column Total 40173 20057 22240 22034 26290 130794

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