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You appear to be referring to the fact that if a/b = c/d then ad = bc.
You know this is true because of the axioms of equality (If you do the same thing to both sides of an equation, then equality is maintained).
a/b = c/d
multiply by d
ad/b = c
multiply by b
ad = bc
If you wish to prove a specific proportion is true, you can test it with the equation ad = bc
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How can you tell if a proportion is false?
Multiply the cross products, and see if they are equal. If they are equal, the proportion is true. If they are unequal, the proportion is false.
What is true about the cross products of a proportion?
They're equal
What is difference between proportion and probability?
Proportion is the probability of a selected sample. probability is the true probability of all cases. If this is not what you are looking for then please specify.
Which statement is true about the population proportion of defective pieces in the 2000 items?
The statement that the proportion of defective pieces is not less than 0 nor greater than 1.
How do you tell a ratio from a proportion?
A ratio is simply a comparison between 2 numbers. Example- 4:3 A proportion is 2 fractions equal to each other or "proportionate".
How can you tell if a proportion is false?
Multiply the cross products, and see if they are equal. If they are equal, the proportion is true. If they are unequal, the proportion is false.
How can you tell if a proportion is true?
If you cross-multiply and you obtain an equality, then the proportion is true. Example: 2/3 = 20/30 ? cross-multiply; 2 x 30 = 3 x 20 ? 60 = 60 Since we have an equality, the proportion is true.
What does a 95 percent confidence interval tell you about the population proportion?
There is a 95% probability that the true population proportion lies within the confidence interval.
Is this a true proportion 25 75 equals 9 27?
Yes the proportion for them both is 1:3
What is true about the cross products of a proportion?
They're equal
Total variable cost does not increase in proportion to output is it true?
False, it is the fixed cost which is not increased or decreased with proportion to output.
Arrange the four numbers to form proportion that is true?
40,50,80,64
What is a true proportion?
A true proportion is when two ratios are equal to one another. To prove this, you need to find the cross products of the ratios and see if they are equal. An example of a true proportion are the ratios 1/2 and 5/10, if you take the cross product the result is 2 x 5 = 1 x 10, which are equal.
What is difference between proportion and probability?
Proportion is the probability of a selected sample. probability is the true probability of all cases. If this is not what you are looking for then please specify.
Inbreeding decreases the proportion of homozygotes in a population?
that is true!! the answer is very much true!! just ask mydog sparky!!
Minerals and compounds that are not present in the proper proportion can cause sickness or death?
true
The expected frequency is determined by multiplying the sample size by the hypothesized proportion?
True.
