In a random sample of 625 people, it was found that 225 of them frequently check their work email when they are at home. find the upper confidence limit of a 95% confidence interval for p, the true proportion of people who frequently check their work email when they are at home. give your answer to four decimal places

(0.3224,0.3976)

Step-by-step explanation:

Given : Sample size : n=625

Number of people check their work email when they are at home =225

The probability of people check their work email when they are at home :

Significance level :

Critical value :

The confidence interval for population proportion is given by :-

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct

the answer is b