00:01
Tv advertising agencies face increasing challenges in reaching audience members because viewing tv programs via digital streaming is gaining in popularity.
00:10
A poll reported that 58 % of 2 ,341 american adults surveyed said that they have watched digitally streamed tv programming on some type of device.
00:30
What is the lower bound of a two -sided 95 % confidence interval for the proportion of american adults that have watched a digitally streamed program? 95 % confidence interval is 0 .58 minus 1 .96 times the square root of 0 .58 times 1 minus 0 .58 which is 0 .42 over 2 ,341.
01:01
0 .58 minus a margin of error rounded to three decimal places of 0 .020 which is 0 .560.
01:26
A psychology student is interested in people's general approval of nintendo's new online expansion pass.
01:36
They sample a total of 2 ,001 games.
01:40
What sample size would be required for a confidence interval for the proportion of switch owners that plan to get an expansion pass at a 99 % confidence level with a margin of error of at most 0 .05? suppose a forum claims that 50 % of their participants planned to get the expansion pass.
02:05
We'll set that margin of error equal to the critical value for a 99 % confidence interval which is 2 .576 times the square root of 0 .5 times 0 .5 over our unknown sample size.
02:18
So n is going to be equal to 0 .5 times 0 .5 divided by the quantity of 0 .05 over 2 .576, that quantity squared...