• Assume that a recent survey on public obedience for COVID-19 control, 500 respondents8are asked whether they have used face mask during the most recent visit to a shopping mall. Results of the survey are provided in the following contingency table
• Wearing faceAges of respondent
• mask16-2526-3536-45total
• Yes 56 84 86 226
• No 76 56 42 174
• Total 132 140 128 400
• At 5% level of significance, test whether wearing face mask and age are related.

• Q3.In a recent survey conducted by aLaid Backclub shows the amount of time spent on6Facebook per week for 8 students are provided below.

41, 22, 38, 16, 26, 19, 23, 25

• At 5% level of significance, can you conclude that the median amount of time spent on Facebook per week by students is less than 21 hours?
• Q4.Tips received by 4 servers on a recent Friday night at three restaurants are provided below.
• Samsara 33,45,39,30
• Calisto 19,33,26,28
• Maynerd 51,75,49,55

Calculate the between-samples and within-samples variances.