QUESTION $1($Compulsory Question$)(30$ marks$)$

A$.$ The time to make beds at a motel should fall into an agreed on range of times. A sample $0$ four unaids was selected, ad the time needed to make a bed was observed on four different occasions:

$\backslash$table$[[\backslash$table$[[$Service$],[$Person$]],$Sample $1,\backslash$table$[[$Sample$],[2]],$Sample $3,$Sample $4,],[],[$Margaret$,200,150,175,90,],[$Joan$,120,180,105,140,],[$Sonia$.,110,90,130,150,],[$Judith$,115,110,145,175,],[,,,,,\backslash$table$[[$For Part$],[$B Oney$]]],[$Total$,,,,,192],[\stackrel{}{x},,,,,],[R,,,,,],[$Raquel$,210,200,100,75,],[$Revised $\stackrel{}{x},,,,,],[$Revised R$,$z$,,,,]]$