Answers a-c please! Scientists are working on a synthetic vaccine (antigen) for a particular parasite. The success of the vaccine hinges on the characteristics of DNA in peptide (protein) produced by the antigen. In one study, scientists tested alleles of antigen-produced protein for level of peptide. For a sample of 44 alleles, the mean peptide score was 1.391.39 and the standard deviation was 0.140.14.
a. Use this information to construct a 9090% confidence interval for the true mean peptide score in alleles of the antigen-produced protein.
b. Interpret the interval for the scientists.
c. What is meant by the phrase "9090% confidence?"

the answer two this problem is a

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

answer: b.

step-by-step explanation:

the y coordinate for point b is 0, and answer b is the only one with that y coordinate.