4 Pages
Unlock Document

University of Toronto St. George
Statistical Sciences
Michael Reid

Last nameFirst name Student STA 304H1 F1003H F SUMMER 2009 First Test May 28 20 Duration 50min Allowed handcalculator aidsheet one side with theoretical formulas and definitions only 25 1 A marketing analyst is asked to study the buying habits of shoppers at a national chain store eg Sears Suppose there are 150 stores around the country a Describe the population of interest b Describe in short a realistic sampling procedure for obtaining a representative sample in this problem and give a name of the procedure c Are the target population and sampled population the same Explain some related problems d Give two variable of interest related to element of the population one quantitative the other qualitativee Describe an appropriate method of data collection in this study Solutions 5a All shoppers at the chain store More accurate definition would be All shoppers that regularly shop at the chain store but then it should require to defining who is a regular shopper The definition may also include a time period of shopping 57b Two stage cluster sampling First select an SRS of stores and then a sample of customers eg when entering the store or at exit using systematic sampling because a list of shoppers does not exist 7 Selecting customers from each store is possible but would be inconvenient and much more costly Also the sampling design may include a rule of selecting a sampling day at the store Sampling at the same day at every store may produce a bias result It is also possible to send a questionnaire to the registered customers most of them may have the chains membership card but this would also be very costly and with a large nonresponse rate 6c They are not the same If the sample is taken from the shoppers present at stores that the sampling population is much smaller that the target population If the sample is taken from registered shoppers many shoppers may not be registered 64d Quantitative amount of money spent in one visita year number of items purchasedQualitative item of primary interest items of interest found satisfaction43 e A short personal interview or short questionnaire filled in at the spot 3 1
More Less

Related notes for STA304H1

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.