Question

tate the full name of the sample type for each scenario.


(a) In an effort to determine customer satisfaction after cancelling three sailings due to a crane accident and all sailings scheduled to visit Cuba in 2019, nine reported norovirus outbreaks during 2013 – 2019 sailings, and several failed sanitation inspections in 2014, Royal Caribbean International randomly selects two-thousand cruise or cruise-tour departing from ports during 2013 – 2019 and randomly selects ten interior cabins, ten ocean view cabins, ten balcony cabins, and ten deluxe suite cabins from each ship, sending a survey to each person who stayed in these cabins during the selected cruise or cruise-tour.



(b) You are hired by JetBlue to determine customer satisfaction with JetBlue flights departing from Boston's Logan International Airport. During one month, you randomly select two-hundred-fifty flights from among all the flights for all the routes and administer a survey to everyone on each selected flight.



(c) In an effort to determine customer-satisfaction with Keolis, the operator of the Commuter Rail, the General Manager of the Massachusetts Bay Transportation Authority (MBTA) hires a marketing and research firm to conduct a survey of weekday riders of the Commuter Rail. The firm randomly selects twenty-five regular weekday trains and surveys thirty randomly selected customers riding those trains regarding their satisfaction with the Commuter Rail.



(d) In an effort to identify whether an advertising campaign has been effective, a marketing firm hired by Comcast Corporation conducts a nationwide poll by selecting every twenty-fifth person on a list of known XFINITY customers starting with the seventeenth.

Answer 1

a)

since here we have taken samples from each type of cabin

in stratified sampling we divide population in different groups (called strata) then select sample from each strata hence its

stratified sampling

b)

here we are selecting sample randomly without caring about route and other factors hence its

simple random sampling

c)

here we have first selected trains as sample then selecting random samples from those trains hence its

two stage sampling

d)

here we are selecting every 25th person hence its

systematic sampling