A local elementary school offers a morning kids’ camp that runs from 9 a. m. until noon Monday through Friday. The camp director would like to know if evening camps would be better attended by the children in the community than morning camps. Upon pickup, a random sample of parents was asked, “Do you prefer morning camp hours (9 a. m.–noon) or would you prefer evening camp (6 p. m.–9 p. m.)?” A majority of parents indicated that they prefer the morning camp hours.
a) What type of bias does this survey display? What is a possible consequence of this bias for interpreting the results of this survey?
Someone advised the camp director to take a separate random sample of parents in the community who do not currently send their children to the morning camp, and then compare the proportion of parents who prefer the evening camp for both groups.
b) If the camp director combined the two separate samples into one, what type of sampling method would best describe the resulting sample? Would this be a suitable solution to the problem identified in part (a)?
c) Suggest a different sampling method from the one described in part (b) that the camp director could use to determine if evening camps would be better attended than morning camps. What is a benefit of this method?

a) In the given survey, a selection bias may occur as the director of camp picks up a random sample of parents. The proportion of parents may differ as some of them are currently sending their children in a morning camp, while  some are not currently sending their children in a morning camp. Depending upon these characteristics, the response may vary largely.

b) If the camp director combined the two separate samples from two different strata into one, this will be stratified sampling as the director takes a sample from two different groups with specific characteristics. But, this sampling would not be a better solution to the problem as the group of parents who do not send their children to a morning camp is also taken into account, who can unknowingly give responses about a morning or evening camp.

c) Purposive or convenience sampling would be better to use here than stratified sampling. As the camp  director wants to know if evening camp would be better attended by the children in the community than a morning camp, the focus group for this survey is the parents who are currently sending their children to the morning camp as they are familiar with the morning camp, they can give the best response.

Explanation:

the indirect evidence that supports that the bubbles so generated are oxygen is that the bubbles in the plant increases when it moves towards the brighter light.

c plumb line

explanation:

because god's plumb line “has a lot to do with the poor. it has a lot to do with righteousness that is living in right relationship with god and neighbor.