Q4. - Algebra 1

Question

Give each survey report, evaluate the validity of the information and conclusion.

 

A shopping mall owner wants to know during what hours the most people prefer to shop. One day every 10^th person who entered the mall was asked what times he or she preferred to shop.

Conclusion: The mall should remain open from 9 AM until 9PM.

Results

Choice	Response
Before 9:00 AM	26%
9:00 AM – 12:00 noon	12%
12:00 noon – 3:00 PM	26%
3:00 PM – 6:00 PM	27%
6:00 PM – 9:00 PM	9%

Step-by-Step Solution

Answer

The conclusion is not valid.

Step 1. State the concept for sampling.

A sample is the specific group that you will collect data from. The size of the sample is always less than the total size of the population. 

Sampling is the process ir method of selecting samples from a population based on some rules or criteria. The sampling method depends on the type of analysis that is going to be done on the population. It may be simple random sampling or systematic sampling or stratified sampling.

Step 2. State the concept for biased and unbiased sample.

Biased smaple means the sample is not representive of the populaiton, which means the method for getting the sample is defective.

 

Unbiased sample means the sample is representive of the population.

Step 3. State the answer with an explanation .

Since, the report did not indicate the number of people surveyed though the sample is randomly chosen every 10th person entering the mall so the conclusion is not valid.

Hence,

The conclusion is not valid.