Question

Sixty college students were asked where they shop online to determine on which websites the college should place advertisements. The data from the random sample of students is represented below. They compared Etsy, Amazon, and Ebay. Test at the .05 level of significance.

What are your null and alternative hypotheses?

What is the critical value?

Amazon	Etsy	Ebay
12	36	12

What is your decision?

Reject the Null

Fail to Reject the Null

What is your interpretation of the following (ie. conclusion)?

Answer 1

Ho: There is no significant difference in three websites to place adverrisements

Ha: There is a significant difference in three websites to place adverrisements

observed frequencey, O	expected proportion	expected frequency,E	(O-E)		(O-E)²/E
12	0.333	20.00	-8.00		3.200
36	0.333	20.00	16.00		12.800
12	0.333	20.00	-8.00		3.200

chi square test statistic,X² = Σ(O-E)²/E =   19.200              
                  
level of significance, α=   0.05              
Degree of freedom=k-1=   3   -   1   =   2
                  
P value =   0.0001   [ excel function: =chisq.dist.rt(test-stat,df) ]          
Decision: P value < α, Reject Ho                  

decision: reject the null

conclusion: There is enough evidence to conlcude that there is a significant difference in three websites to place adverrisements