How do you subtract fractions with different denominators?
2 answers:
Answer:
When solving fractions with different denominators, you first need to make the denominators the same.
Example:
-
You need to make sure the denominators are the same.
Can 2 get multiply by something and will be 4?
The answer is yes, if you multiply 2 by 2, it will change the 2 to 4. You have to multiply the equation by
(which is also equivalent to 1) and which change the equation to
.
And now you can subtract because the denominators are the same.
Hope this helps!
If you have any questions feel free to ask.
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Answers and Step-by-step explanation:
Hypotheses are:
H o=19.8
H 1 ≠19.8
Here we have following information:
s=2.45, X bar=20.1, n=50
So test statistics will be
t=20.1-19.8/(2.45/ =0.87
Degree of freedom : d f = n - 1 = 50 - 1 =49
Test is two tailed so critical value of the test is -1.30 and 1.30.
Rejection region:
if t < -1.30 and t > 1.30, reject H o
Since test statistics lie in the rejection region so we fail to reject the null hypothesis.
(b)
The observed significance of the test is
P value =0.3885
(c)
Since p value is greater than 0.20 so we fail to reject the null hypothesis.