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gunnatvinson
15.01.2020 •
Mathematics
Which property is demonstrated in the equation
(2+x)+3y = 3y+(2+x)
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Ответ:
I could be wrong, but I do not think it matters what you put
Here is what I mean:
2+x=2+x
3y=3y
Despite the value, of what you pit for x or y, the sum is always equivalent. So you can pretty much put any value and it will be accurate. I hope this helps. :)
Ответ:
Step-by-step explanation:
Hello!
The FMA Company designed a new type of bowling ball and want to test if the new bowling average differs from the bowling average of the old model. Symbolically μ≠155
Sample:
n= 120 men bowling in scratch leagues
sample mean x[bar]= 170
variance δ²= 100
The hypothesis is:
H₀:μ=155
H₁:μ≠155
α: 0.05
The statistic to use for this hypothesis, assuming that the variable has a normal distribution.
Z= x[bar]-μ ≈ N(0;1)
δ/√n
The critical region for this test is two-tailed, this means you'll reject the null hypothesis to small or big values of the statistic.
You'll reject the null hypothesis to values of Z≤-1.96 or Z≥1.96.
Under the null Hypothesis the statistic value is:
Z= x[bar]-μ
δ/√n
Z= 170-155
10/√120
Z= 15/0.913 = 16.42
Decision: Reject the null Hypothesis.
I hope you have a SUPER day!