Abank wants to get new customers for their credit card. they try two different approaches in their marketing campaign. the first promises a "cash back" reward; the second promises low interest rates. a sample of 500 people was mailed the first brochure; of these, 100 get the credit card. a separate sample of 500 people was mailed the second brochure; 125 get the credit card. are the two campaigns equally attractive to customers? find the test statistic. and compute a 95% confidence interval for the difference between the two proportions

(-0.1018, 0.0018)

Step-by-step explanation:

Given that a  bank wants to get new customers for their credit card. They try two different approaches in their marketing campaign. The first promises a "cash back" reward; the second promises low interest rates. A sample of 500 people was mailed the first brochure; of these, 100 get the credit card. A separate sample of 500 people was mailed the second brochure; 125 get the credit card.

i.e. p1 =

p2 =

p difference =

Combined p =

1-p = 0.775

Std error for difference =

Margin of error for 95%

=1.96 * std error = 0.0518

Confidence interval for differnce =

answer: standard form is ax^2 + bx + c = 0

step-by-step explanation:

standard form is ax^2 + bx + c = 0

(2x + 1)(x - 2) = 0

distribute to get into standard form

2x^2 - 4x + x - 2 = 0

2x^2 - 3x - 2 = 0

a = 2, b= -3, c = -2

a is your answer