For one week, every third customer who makes a purchase at MacBurger is asked a quick 2 question survey regarding what their favorite menu item is and what item they would most like to see added onto the menu. Do you believe the results of this surveyr would be valid? uhm please explain

That sounds like a valid survey of the menu items at MacBurger. One out of three customers (33%) is certainly a large enough sample.

The only problem I can see is that if this a national chain, then different restaurants in different parts of the country may have differing favorites.

how can u determine if it is a valid or not valid?

http://writing.colostate.edu/guides/research/relval/

hi i read the link ,...but please re-word this because i cant clearly understand it as a 7th grader..

"Validity refers to the degree to which a study accurately reflects or assesses the specific concept that the researcher is attempting to measure"

A survey is valid if it correctly answers the question that researcher was asking.

In this case, the researcher wanted to know what people wanted to buy at this restaurant. Asking 1/3 of the customers these questions over a week's time assures that the answers have provided accurate answers to this question.

To determine whether the results of the survey would be valid, we need to consider a few factors:

1. Sampling method: The survey only includes every third customer who makes a purchase at MacBurger. This method of sampling is called systematic sampling. While it can be a valid sampling technique if the customers are randomly distributed throughout the week, there could still be potential bias. For example, if certain days or times attract different types of customers. It may be more representative to randomly select customers from a range of different days and times.

2. Sample size: The number of customers surveyed is also important. If the sample size is too small, the results may not accurately represent the preferences of all MacBurger customers. A larger sample size generally provides a more reliable representation. The optimum sample size would depend on various factors, such as the total number of customers and the desired level of precision.

3. Response bias: The fact that the survey is voluntary means that not all customers will necessarily participate. This could introduce response bias if the opinions of those who complete the survey differ significantly from those who do not. Additionally, customers may be more likely to answer the survey if they have strong opinions, which could skew the results.

Given these considerations, it is difficult to determine the survey's validity without specific details about MacBurger's customer base, the actual number of customers surveyed, and potential response bias. To improve the validity of the survey, random sampling and a larger sample size could be considered to increase representativeness and reduce bias.