For the fourth question, the option in all (A,B,C,D, and E) are: 1)increase 2)De
ID: 3128872 • Letter: F
Question
For the fourth question, the option in all (A,B,C,D, and E) are: 1)increase 2)Decrease 3)Remain the same 4) cannot be determined Question Part1 submissions Used 0/100 Let two events-call them event "A" and event "B"-be such that p(A n B)-0.25. This implies that: Select Select- Events A and B cannot be independent Events A and B cannot be complements of each other Events A and B must also be independent Events A and B must also be complements of each other Question Details My Notes Ask Your Teache 4 CI Consider that a pilot study has been done for the purposes of estimating the sample size required in order to obtain a for a population average. For each of the following changes choose whether the effect on the required sample size would be an increase, a decrease, remain the same, or indeterminable. Note that you should assume all other features about the sample and population remain the same the indicated change(s) A) Increase the pilot sample standard deviation and simultaneously decrease the required confidence level: l except for Select- 8) Decrease the required margin of error and increase the confidence level: c) Increase the population size from 4 million to 25 million and increase the pitot study sample average D) Increase the population size from 4 million to 25 milion and increase the required margin of error E) Increase the required margin of error and, simultaneously, Increase the confidence levelExplanation / Answer
4.
(a)
When estimate sample size, standard deviation and z-critical corresponding to confidence level both comes in numerator. So increasing standard deviation and decreasing confidence level (which increase critical value) will increase the sample size. So option "1)increase" is correct.
(b)
When estimate sample size, margin of error comes in denominator and z-critical corresponding to confidence level both comes in numerator. So decreasing margin of error increase the sample size while increasing confidence level (which decrease critical value) will decrease the sample size so option "4) cannot be determined' is correct.
(c)
3)Remain the same
(d)
Increasing population size does not effect the sample size estimation but as the margin of error increases it decreases the sample size. So option " 2)Decrease" is correct.
(e)
4) cannot be determined