Final answer:
The survey issue in this question is that the results are based on a relatively small sample size compared to the total population. Small sample sizes can lead to less accurate and representative results.
Step-by-step explanation:
In the given question, the survey issue is that the results are based on responses from a sample of only 7000 out of 25000 people who received questionnaires. This means that the sample size is relatively small compared to the total population. Small sample sizes can lead to less accurate and representative results.
One potential problem with small sample sizes is selection bias. This means that the group of people who choose to respond may not be representative of the entire population. For example, if the survey is conducted through the internet, only people who have internet access and are willing to participate will respond.
Another potential issue is nonresponse bias. This occurs when some people choose not to respond to the survey, leading to a biased sample. For example, if certain groups of people are more likely to respond than others, the results may not accurately reflect the opinions or characteristics of the entire population.