Question 1

The probability of any one person in the population being selected into a referral sample cannot be calculated.

Accepted Answer

The probability of any one person being selected into a referral sample depends on various factors such as the selection criteria, the size of the population, and the sampling technique used. Without knowing these factors, it is impossible to calculate the probability of any one person being selected.

Question 2

Researchers should follow to the sample size formula closely when calculating sample size. Any other consideration will only bias the calculation and invalidate the results.

Accepted Answer

While the sample size formula is important, researchers must also consider factors like population variability, confidence levels, and practical constraints to ensure accurate and valid results.

Question 3

Variability is defined as the amount of dissimilarity or similarity in respondents' answers to a particular question.

Accepted Answer

Variability is indeed defined as the amount of dissimilarity or similarity in respondents' answers to a particular question.

Question 4

With the 99% level of confidence, the corresponding z value is 2.58.

Accepted Answer

This is true according to the standard normal distribution table.

Question 5

The statement "You can take any finding in the survey, replicate the survey with the same probability sample size, and you will be very likely to find the same finding within the + percent range of the original finding." is based on the idea of the confidence interval.

Accepted Answer

The statement is based on the concept of the confidence interval in statistics, which is a range of values that is likely to contain the true population parameter with a certain level of confidence. Therefore, if a survey is conducted with the same probability sample size and method, it is expected that the findings will fall within the same confidence interval as the original survey, which is usually reported with a margin of error or a percentage range.

Question 6

If you calculate sample size with e = 3 percent, and then you decide to change e to 5 percent, the required sample size will increase.

Accepted Answer

Increasing the margin of error (e) from 3 percent to 5 percent will decrease the required sample size, as a larger margin of error allows for more variability in the data.

Question 7

A graph of the relationship between accuracy and size of the sample shows that accuracy decreases as sample size increases.

Accepted Answer

The statement is false. As sample size increases, accuracy generally increases due to a reduction in sampling error.

Question 8

Using the confidence interval formula for calculating sample size, the percentage level of confidence desired to the estimate of the population values must be determined and is used in the formula in the form of the z-value it represents.

Accepted Answer

This statement is correct. The confidence level desired is used to determine the z-value which is then plugged into the formula for calculating sample size.

Question 9

Using the confidence interval formula for calculating sample size, the amount of variability believed to be in the population can be estimated.

Accepted Answer

The confidence interval formula for calculating sample size takes into consideration the amount of variability believed to be in the population, which is estimated in order to determine an appropriate sample size.

Question 10

The desired accuracy should NOT be considered in order to calculate the proper sample size as it will bias the calculation.

Accepted Answer

The desired accuracy is crucial in determining the proper sample size, as it helps ensure that the sample is representative enough to achieve reliable results.

Question 11

One of the greatest pluses of online panels is the high response rate, which ensures that the final sample closely represents the population targeted by the researcher.

Accepted Answer

Online panels typically have high response rates compared to traditional survey methods, which increases the likelihood that the sample accurately represents the target population.

Question 12

Sample error may only be determined after data have been collected. Even if we know the level of confidence, an estimate of variability and the sample size, we cannot compute the amount of sample error we can expect to experience.

Accepted Answer

The statement is incorrect. Sample error can be calculated based on the level of confidence, estimate of variability, and sample size, even before data collection.

Question 13

Sample size calculations will need to be adjusted due to incidence rate, nonresponse, and even cost constraints.

Accepted Answer

The answer of Sample size calculations will need to be...

Question 14

It is an ethical marketing researcher's responsibility to try to educate a client on the wastefulness of excessively large samples.

Accepted Answer

Ethical marketing researchers should consider the impact of their research on the environment and be mindful of the resources used. Educating clients on the importance of using appropriate sample sizes can help reduce waste and promote sustainable practices in research.

Question 15

When using nonprobability samples instead of probability samples, different formulas must be applied to determine the appropriate sample size that precisely balances desired accuracy, variability in the population, and level of confidence.

Accepted Answer

The answer of When using nonprobability samples instead of probability...

Quiz 9: Sampling