7a 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 below represent the number of groups of dolphins that were partaking in an activity at certain times of days: Table: Dolphin Activity Activity Period Row Total Morning Noon Afternoon Evening 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 Is there enough evidence to show that the activity and the time period are independent for dolphins? Test at the 1% level. (i) Which of the following statements correctly defines the null hypothesis HO? A. the activity for dolphins is independent of the time period B. the activity for dolphins is not independent of the time period C. neither of these statements is correct for HO Enter letter corresponding to correct answer (ii) Which of the following statements correctly defines the alternative hypothesis HA? A. the activity for dolphins is independent of the time period B. the activity for dolphins is not independent of the time period C. neither of these statements is correct for HA Enter letter corresponding to correct answer (iii) Enter the level of significance α used for this test: Enter in decimal form. Examples of correctly entered answers: 0.01 0.02 0.05 0.10
q7a
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 below represent the number of groups of dolphins that were partaking in an activity at certain times of days:
Table: Dolphin Activity
|
Activity |
Period |
Row Total |
|||
|
Morning |
Noon |
Afternoon |
Evening |
||
|
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 |
Is there enough evidence to show that the activity and the time period are independent for dolphins? Test at the 1% level.
(i) Which of the following statements correctly defines the null hypothesis HO?
A. the activity for dolphins is independent of the time period
B. the activity for dolphins is not independent of the time period
C. neither of these statements is correct for HO
Enter letter corresponding to correct answer
(ii) Which of the following statements correctly defines the alternative hypothesis HA?
A. the activity for dolphins is independent of the time period
B. the activity for dolphins is not independent of the time period
C. neither of these statements is correct for HA
Enter letter corresponding to correct answer
(iii) Enter the level of significance α used for this test:
Enter in decimal form. Examples of correctly entered answers: 0.01 0.02 0.05 0.10
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