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sweet [91]
2 years ago
8

A manufacturer claims that its new hand sanitizer reduces the number of days an average person is sick in a year. To test this c

laim, a researcher decided to conduct an experiment. The researcher randomly selected 300 people, divided into subject groups by age. Over the course of a year, all the subjects regularly used the hand sanitizer. At the end of the year, the researcher compared the number of days that the subjects in each group were sick.
Which statements about this experiment are true?

Mathematics
2 answers:
Andrew [12]2 years ago
5 0

Answer:

The study uses blocking and random sampling.

Step-by-step explanation:

marysya [2.9K]2 years ago
3 0

Answer:

in my opinion is the last:

this studies uses a control group

Step-by-step explanation:

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Pls help I’ll brainlest ASAP and add extra points I’m failing
Step2247 [10]

Step-by-step explanation:

you drew already the right things, you have everything.

so, what is the problem ?

the most common form of line equation is

y = ax + b

a is the slope of the line. it is expressed as the ratio

y coordinate change / x coordinate change

when going from one point to the other.

b is the y-intercept (the y value when x = 0).

once we have the slope, we get b by using the coordinates of one of the given points as x and y in the equation and solve for b.

so, for the 2 marked points you showed correctly the differences :

x changes by +8 (from -4 to 4).

y changes by -2 (from 3 to 1).

so the slope is -2/+8 = -1/4

the y-intercept we also see directly in the chart : +2.

3 0
2 years ago
What is the answer <br> A.<br> B.<br> C.<br> D.
RUDIKE [14]

Answer:

B.

Step-by-step explanation:

The opposite of 5/2 is -5/2 which is -2 1/2 and the opposite of -1/2 is 1/2.

4 0
2 years ago
A ladder is leaning against a wall. The top of the ladder is 9 feet (ft) above the ground. If the bottom of the ladder is moved
Dmitriy789 [7]
The ladder is 9.5 feet
8 0
2 years ago
I need help in this question
tiny-mole [99]

Answer:

C. 12/15

Step-by-step explanation:

2/3, 6/9, and 18/27 all simplify to 2/3. 12/15 does not.

8 0
2 years ago
Please help i have been on this for hours.
timurjin [86]

Answer:

2. 8

3. 6

4. 8

5. -8

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
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