Question 4 (16 points)

An audio-visual magazine successfully interviewed 250 smart phone users using a questionnaire. They are required to fill in the gender and information of the smart phone system on the questionnaire. The relevant survey results are listed in the table below:

Boys:

IOS: 74

Android: 44

Girls:

IOS: 89

Android: 43

At a significant level of 1%, using chi-square test, check whether there is evidence that gender and the smartphone system used are independent of each other.