A tutorial school has been running IELTS mock examination for many years. Below is the summary presented by the tutorial school related to the IELTS mock examination in one of the many online classes...

Extracted text: A tutorial school has been running IELTS mock examination for many years. Below is the summary presented by the tutorial school related to the IELTS mock examination in one of the many online classes selected randomly in year 2022. IELTS score in mock examination Number of students < 4="" 2="" 6.="" 7="" 15="" 8="" 10="" 9.="" 3="" a="" report="" presented="" by="" this="" tutorial="" school="" 5="" years="" ago="" indicated="" that="" the="" population="" mean="" score="" of="" ielts="" mock="" examination="" was="" 7.05="" points="" and="" the="" population="" proportion="" of="" students="" got="" 7="" points="" or="" above="" was="" 0.67.="" (a)="" construct="" a="" 95%="" confidence="" interval="" estimate="" of="" population="" mean="" score="" a="" student="" get="" in="" the="" ielts="" mock="" examination="" in="" 2022.="" (b)="" test,="" at="" 1%="" level="" of="" significance,="" if="" the="" population="" proportion="" of="" students="" get="" 7="" points="" or="" above="" in="" 2022="" is="" higher="" than="" that="" in="" year="" 2017.="" (the="" report="" must="" include="" the="" (i)="" null="" hypothesis="" and="" alternative="" hypothesis,="" (ii)="" rejection="" region(s),="" (iii)="" calculation="" of="" test="" statistics,="" and="" (iv)="" conclusion.)="" (c)="" if="" the="" confidence="" interval="" estimate="" in="" part="" (a)="" is="" constructed="" at="" 99%="" instead="" of="" 95%,="" would="" the="" interval="" be="" (i)="" wider,="" (ii)="" narrower,="" or="" (iii)="" no="" change="" in="" width?="" (state="" your="" answer,="" no="" explanation="" is="" needed="" in="" part="">