What is the equation? will give brainliest!

Step-by-step explanation:

Start by finding the slope of the line between those 2 points.  The slope formula is the difference between the y-terms over the difference between the x terms.  Ours looks like this:

Now that you know the slope, you can plug it into either the point-slope formula or the slope-intercept formula using one of the given points and get your equation that way.  I used point-slope, but either way you'll get the same equation.

y - 1 = -4(x - 4) and

y - 1 = -4x + 16 so

y = -4x + 17

The 'part b' of this question is incomplete. I got the complete form of 'part b ' from google as below:

(b) Find a 90% confidence interval for the mean increase in production of interferon gamma after drinking tea for one week.

a) The most appropriate method for this analysis is paired data difference in means (option A).

b)  The 90% Confidence interval is 62.3 to 523.7.

Step-by-step explanation:

Given details:

Sample= 5

Mean difference: \bar{X_d}=293

Difference standard deviation: S_d=242

a)  The most appropriate method for this analysis is paired data difference in means.

b) t value at 90%= 2.132

CI = dbar +/- t *(sd/sqrt(n))

= 293 +/- 2.132 *(242/sqrt(5))

= (62.3 ,523.7)

The 90% Confidence interval is 62.3 to 523.7