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FromTheMoon [43]
2 years ago
9

How many ratios ratios are needed to solve a percent problem?​

Mathematics
2 answers:
Lostsunrise [7]2 years ago
5 0

Answer:

2 ratios

Step-by-step explanation:

Klio2033 [76]2 years ago
4 0

Answer:

two ratios

Step-by-step explanation:

you need two to be able to solve it

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Pschological tests are often used to determine the hostility levels in people. High scores on the HLT pschological test correspo
algol13

Answer:  the correct answer is we are 95% confident that there is no statistically significant difference in the mean treatment  methods for hostility.  

Step-by-step explanation:

1)  Test for the equality of variances in the two groups to choose the appropriate t-test.  

H0: σ (1)^2 = σ (2)^2  

Ha: σ (1)^2 ≠ σ (2)^2  

Larger variance = 64  

Smaller variance = 49  

F = 1.30612  

Degrees of freedom 15 and 9  

Critical F from the table (with alpha=0.05) = 2.58  

Calculated F is smaller than critical F, so we use the pooled variance t-test.  

Sample 1 size 7  

Sample 2 size 8  

Sample 1 mean 79  

Sample 2 mean 84  

Sample 1 S.D. 7  

Sample 2 S.D. 8  

Pooled S.D = [(n1-1)s1^2+(n2-1)s2^2]/(n1+n2-2)

Pooled variance s = [(6)(49)+(7)(64))] / (13) =  (294+448)/13=742/13=57.076923

Pooled variance s^2 = 57.076923  

Standard error of difference in means = sqrt(1/n1+1/n2) times sqrt(s^2)  

Standard error of difference in means = (0.517549)(7.554927) = 3.910046 (denominator of t)  

Confidence interval = (mean1-mean2) +/- t SE  

t is the critical t with 24 degrees of freedom = 2.056  

(79 - 84) +/- (2.056) (3.910046)  

= (-13.04, 3.04)  

Interval encloses 0  

We are 95% confident that there is no statistically significant difference in the mean treatment  methods for hostility.  

4 0
3 years ago
Cho hàm số 2 2 3 1 2 ( )
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Answer:

ok

Step-by-step explanation:

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1. 4/5

2. 80%

Step-by-step explanation:

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3(×+2)=24 can you help me​
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x = 6 if that's what your asking

Step-by-step explanation:

please give brainliest

3 0
3 years ago
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Which choice is an irrational number?
Dmitry [639]

Answer:

3 one good luck with the question

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2 years ago
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