2.The owner of a store wants to examine whether method of
payment (with either cash, credit card or debit card) and age group
(of either ≤ 18 years, between 18 to 40 years, and ≥ 40 years)
of paying customers, are independent. The following table
summarises the observed frequencies:
Method of payment
Age
Cash
Creditcard
Debitcard
Total
≤ 18 years
23
27
11
61
between 18 to 40 years
25
5
23
53
≥ 40 years
15 22
4
41
Total
63
54
38
155
What is the critical value if testing at α of 5%?
Please give your answer correctly rounded to two decimal
places.