Question

data from four identical trials on a new sleep herb are shown in the table. complete parts (a) and (b)

group	number of subjects	number who reported better sleep
b	170	35
c	210	48
d	190	40

a. what conjecture can be made about the effectiveness of the herb? select the correct choice below and fill in the answer box to complete your choice. (round to the nearest integer as needed.)
a. the herb is effective in improving sleep for about % of all people.
b. in any group of people, the herb is effective in improving sleep for about people.

Explanation:

Step1: Calculate total number of subjects

$250 + 170+210 + 190=820$

Step2: Calculate total number of people who reported better sleep

$55 + 35+48 + 40 = 178$

Step3: Calculate the percentage of people who reported better sleep

$\frac{178}{820}\times100\approx22$

Answer:

A. The herb is effective in improving sleep for about 22% of all people.