Question

A researcher wishes to estimate with the population proportion of motor video that were used by compared driving estimate must be accur win 2% of the population a) No pronary Fe Find the same Compare the results from pars and g e d a prostody that found that mor e that by doing a) What is the minimum sample de m ing that no prior information is to Round up to the nearest whole number as needed) (b) What is the minimum sample sented using a prior study found that of more video s that were used by mohol pred driving? Round up to the newest whole number as needed) (c) How do the rest from and compare? OA Having and the p rinces s ed OC. Having an estimate of the population proportion des te m d

Answer 1

n = (3) 2*p*9

a) when no preliminary info given then p = q = 0.5

z = 1.96, E = 0.02

n=6002 * 0.5 * 0.5 = 2401

So, n = 2401

b) p = 0.26, q = 1 - 026 = 0.74

.)2 +0.26 0.74 = 1847.8 1848

So, n = 1848

In part b) it is not clear that 26% or 28% given. I used 26% if it's 28% please comment I will do for 28%.

As we see that n is reduced hence option C) having an estimates of the population proportion reduces the minimum sample size needed.

Please comment if any doubt. Thank you.