Ithought of number r, added 12 to it, and doubled the result.

2R+24

two times R plus 24

Step-by-step explanation:

Let

R > the number

step 1

added 12 to number R

That means > sum the number R plus the number 12

so

(R+12)

step 2

doubled the result

That means > Multiply the result in step 1 by 2

so

2(R+12)

Distribute the number 2

2R+2(12)

2R+24

The result is two times R plus 24

There is not enough evidence to support the claim that drug is effective at 1%

Step-by-step explanation:

For this we use the pored test as we have dependent test;

Difference :

10,5,-5,3,-3,4,2,-3,0,10,8,-2,3,-2,5,5,4,0

Hypothesis :

H0 : μd = 0

H0 : μd ≠ 0

The mean of d, dbar = Σd / n = 44 / 18 = 2.44

The standard deviation, Sd = 4.45 (using calculator)

The test statistic, T : dbar / (Sd/√n)

T = 2.44 / (4.45/√18)

T = 2.44 / 1.0488750

T = 2.326

Degree of freedom, df = n - 1 ; 18 - 1 = 17

The Pvalue = 0.0326

α = 0.01

Since Pvalue < α ; we fail to reject H0