I need these plz

Question

A pet supply company wants to find out how satisfied their customers are with their service and inventory.

1)Create a sampling strategy for this pet supply company, one of each type.

a)Convenience

b)Simple random

c)Voluntary

d)Stratified random

e)Systematic random

2)Which of these strategies are biased? Why?

3)Write an unbiased survey question and a biased survey question that this company would ask.

Unbiased:

Biased:

Answer 1

#1)

Convenience: questions the first N customers that appear

Simple random: generates N random numbers {x1,x2,...,xN}

and then questions custome # x1, customer #x2, .... customer #xN

Voluntary: mails out survey and waits for responses

Stratified random: generates a starting number k and then

a stratification constant n...

questions customer #k

questions customer #k+n

questions customer #k+2n

ex. questions customers # 5,8,11,14,17,20,23.... (k=5, n=3)

Systematic random

calculates demographics percentages so as to obtain

representative sample

#2) advantages and disadvantages of each strategy

Stategy advantage disadvantage

---------------------------------------------------------------

convenience fastest and easiest not representative

simple random easy and fast not representative

voluntary fast and easy via low response rate

merge letters

stratified random easy not representative

systematic random most representative most difficult

and time consuming

Biased Question: Tell us why you enjoy our product?

Unbiased question: use Likert Scale...

please rate the quality of the product on

scale of 1 to 5, with 5 being the best