In survey conducted by quinnipiac university from october 25-31, 2011, 47% of a sample of 2,294 registered voters approved of the job barack obama was doing as president. what is the 99% confidence interval for the proportion of all registered voters who approved of the job barack obama was doing as president?

Confidence interval = [ 0.4432, 0.4968]

Step-by-step explanation:

Registered voters approved of the job Barack Obama was doing as president,

p = 47% = 0.47

Total sample size, n = 2,294

Confidence level = 99%

now,

confidence interval for the proportion of all registered voters who approved of the job Barack Obama was doing as president

= p ±

for 99% confidence level, z value is 2.58

= 0.47 ±

= 0.47 ± 0.0268

or

Confidence interval = [0.47 - 0.0268, 0.47 + 0.0268 ]

or

Confidence interval = [ 0.4432, 0.4968]

b. y = 4x - 2

step-by-step explanation:

to find a parallel equation to an equation, make sure both equations have the same slope but different y-intercepts.

y = 4x + 1

4 = slope

1 = y-intercept

y = 4x - 2

4 = slope

-2 = y-intercept

they both have the same slope but different y-intercepts, so, b. is the correct answer.

and to check your work, you can graph both equations. : )