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WARRIOR [948]
2 years ago
15

A researcher is examining the claims made by a water softener salt manufacturer. He performs an experiment using water from a va

riety of sources. For each water source, he has a sample with no treatment and a sample treated with the recommended amount of the water softener salt.
He then tests each sample to measure the softness and compares the results, determining that the claims made by the manufacturer are true.

The conclusion drawn from the study is ___ because the sample is __ In this instance, an __ study was performed.
Mathematics
1 answer:
mylen [45]2 years ago
6 0

The conclusion drawn from the study is instance because the sample is homogenous and an experimental study was performed.

<h3>What is an experimental study?</h3>

An experimental study deals with a dependent variable and there is a dependent variable.

Also, a control is used to establish the validity of the results.

The dependent variable is the level of softness after treatment while the independent variable is the type of water softener used.

The conclusion drawn from the study is instance because the sample is homogenous and an experimental study was performed.

Learn more about the experiment:

brainly.com/question/9199868

#SPJ1

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What is D of the arithmetic sequence for which a5 equals 24 and a9 equals 40
Gnom [1K]

In an arithmetic sequence d represent the common difference.

The formula to find the general term of an arithmetic sequence is,

a_{n} =a_{1} +(n-1)d

Where a_{n}= nth term and

a_{1} = First term.

Given, a_{5} = 24, a_{9} = 40. Therefore,

a_{1} +(5-1)d = 24  , a_{1} +(9-1)d = 40

a_{1} +4d = 24  , a_{1} +8d = 40

Next step is to subtract the above equations so that we can eliminate a1 and get the value of d. Hence,

4d - 8d = 24 - 40

-4d = - 16

\frac{-4d}{-4}= \frac{-16}{-4} Divide each sides by - 16.

d = 4

So, d = 4.

Hope this helps yoi!.

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What is 20- yards loss
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Answer:

The lost 20 yards is 20-

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3 years ago
Match the equations of the lines with their graphs.
xxMikexx [17]

Answer:

Step-by-step explanation:

1. y=2x-3

2. y=2x+3

3. y=-2x+3

4.  y=-2x-3

3 0
3 years ago
Please help asap ☺️ I'll mark you brainliest ​
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Answer: the bottom rectangle is 21 square units

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Step-by-step explanation:

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3 0
3 years ago
Read 2 more answers
A 98% confidence interval for the mean of a population is to be constructed and must be accurate to within 0.3 unit. A prelimina
BaLLatris [955]

Answer:

n = (\frac{2.326*1.7}{0.3})^2= 173.73

And the value for n rounded up would be n = 174

Step-by-step explanation:

We have the following info given:

s= 1.7 previous estimation for the deviation

ME=0.03 the margin of error desired

Conf =0.98 represent the confidence

The Margin of error is given by:

ME = z_{\alpha/2} \frac{\sigma}{\sqrt{n}}

If we solve for the value of n we got:

n= (\frac{z*\sigma}{ME})^2

For this problem we know that the confidence is 98% so then the significance level would be \alpha=0.02 and the critical value would be:

z_{\alpha/2}= 2.326

And replacing we got:

n = (\frac{2.326*1.7}{0.3})^2= 173.73

And the value for n rounded up would be n = 174

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3 years ago
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