Answer:
a/b= 2/15
Explanation:
3a +b
----------- = 7/5
b
<h2>now cross multiple both side</h2>
5(3a+b)=7 x b
15a +5b = 7b
15a = 7b-5b
15a = 2b
15a/2b = 1
a/b x 15/2 =1
<h3>multiple both side
by 2/15</h3>
we get,
a/b = 2/15
hope you have no doubt now !
<h2>we get ,</h2>
The technique to improve internal validity is D) Addition of a control group.
<h3>What is
internal validity?</h3>
Internal validity serves as the study which bring about the establishment of a trustworthy cause-and-effect relationship that can be found in treatment and an outcome.
it should be noted that Internal validity also helps to eliminate alternative explanations , hence, The technique to improve internal validity is D) Addition of a control group.
Learn more about internal validity on:
brainly.com/question/968894
#SPJ1
COMPLETE QUESTOIN:
Which of the following is a technique to improve internal validity ____________?
A) Experimenter expectancy
B) Participant bias
C) Use of a confederate
D) Addition of a control group
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[ You fill in your future goals ]
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Answer:
0.295
Explanation:
Given that:
Total number of modems = 19
Number of defective modem = 3
Non-defective modems = 19 - 3 = 16
Probability of that all selected modems are not defective :
Required outcome / Total possible outcomes
[(16C6) * (3C0)] ÷ 19C6
(8008 * 1) ÷ 27132
8008 / 27132
= 0.2951
Hence,
Probability of accepting the shipment is 0.295
The correct answer is 3 + 6x. Heres why: Add or subtract all of your variables x + 2x + 3x = 6x. Now add or subtract your numbers 7-4= 3. 6x + 3 or 3 + 6x.
