Stat 152Name:_____________________________________

Lab - 1.3 - 1.5

Jeanne McGinnis, Instructor

1.YMCA- Customer survey

The YMCA would like to administer a satisfaction survey to its current members. The YMCA administration would like to ask a sample of 50 members about their level of satisfaction with the YMCA.You are to determine a sampling plan by coming up with a plan for all of the sampling methods that we have discussed and choosing one.Describe your plans below:

Simple Random Sample:

Describe in detail how you will collect the sample.

Stratified Sample:

SubGroups:

Describe in detail how you will collect the sample.

Systematic Sample:

Describe in detail how you will collect the sample

Cluster Sample:

SubGroups:

Describe in detail how you will collect the sample.

Convenience:

Description:

2.Which method do you believe would give you a better answer to your question?Why?

3.Is this an observational study or an experiment that we are conducting?Why?

4.What is the explanatory variable and what is the response variable?

5.Read the following article:https://www.nichd.nih.gov/newsroom/news/111720-asthma-pregnancy

a.Was the study a designed experiment or an observational study?Why?

b.If you answered observational study, what type of observational study was conducted? (cross-sectional, case controlled, cohort)

c.What was the research objective?

d.What was the response variable in the study?

e.Summarize the conclusions in the article.

6.Classify the bias in each of the follow scenarios (sampling, non-response, and response bias).In each case, suggest a solution that will eliminate the bias.

a)Students are asked by their parent whether they had ever cheated on a test.

Bias

Solution

b)A survey asks the question to residents of San Francisco:"Are you in favor of holding the Olympics in San Francisco, even though your taxes may increase?

Bias

Solution

c)The Catawba Valley YMCA places a survey at the exit doors for members to fill out and bring back in. To date, the YMCA has 10 responses.

Bias

Solution

d)The Best Buy store manager want to conduct a study regarding the shopping habits of this customers.She selects the first 50 people that enter the store on a Monday morning.

Bias

Solution