Aresearcher wishes to estimate the proportion of adults who have high-speed internet access. what size sample should be obtained if she wishes the estimate to be within 0.04 with 90% confidence if (a) she uses a previous estimate of 0.38? (b) she does not use any prior estimates?

a-396

b-420

Step-by-step explanation:

=0.1

Margin of Error=0.04

Level of significance is z

Previous estimate

sample size is given by:

n=

n=

Does not use prior estimate

Assume

=0.1

Margin of Error=0.04

Level of significance is z

Population proportion=0.5

n=

n=

n=420.25

step-by-step explanation:

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2