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zheka24 [161]
3 years ago
5

Sara wants to purchase a CD player for $115.99. She earns 5.25 per hour babysitting. If h represents the number of hours she bab

y- sits what expression represents her earnings? Make an input- output table to find how many hours she must baby-sit to buy the CD player
Mathematics
1 answer:
Svetradugi [14.3K]3 years ago
3 0
The answer should be if I am correct 

h times 5.25 


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Enter a fraction equivalent to 0.4. Use only whole numbers for numerators and denominators.
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Answer:

2/5

Step-by-step explanation

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Find the length of the line segment that connects the points (7, 16) and (47, 140)​
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An article presents a study of health outcomes in women with symptoms of heart disease. In a sample of 115 women whose test resu
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Answer:

z(s) is in the rejection region we reject H₀     μ₁  = μ₂  and support the claim that at CI 95 % the means of the two groups differs

Step-by-step explanation:

Sample 1:

Sise sample   n₁  =  115

μ₁  = 169,9 mmHg

σ₁  = 24,8 mmHg

Sample 2:

Sise sample   n₂  =  235

μ₂  = 163,3 mmHg

σ₂  = 25,8 mmHg

We can develop a test hypothesis for differences in means to investigate if the mean peak systolic blood pressure differs between these two groups

We will choose CI = 95 %   then significance level  α  = 5 %

α = 0,05     α/2 = 0,025

z(c) for 0,025 is from z-table   z(c) = 1,96

Test Hypothesis:

Null Hypothesis                                  H₀           μ₁  = μ₂

Alternative Hypothesis                      Hₐ            μ₁  ≠ μ₂

The alternative hypothesis tells us that the test is a two-tail test.

z(s)  =  ( μ₁  - μ₂ ) / √ σ₁²/n₁  + σ₂²/n₂

z(s)  = ( 169,9  -163,3 ) / √ (24,8)² /115   +  ( 25,8)²/235

z(s)  =  6,6  / √5,35 + 2,83

z(s)  =  6,6  / 2,86

z(s) = 2,30

Comparing  |z(c)|    and  |z(s)|

z(s) > z(c)

z(s) is in the rejection region we reject H₀     μ₁  = μ₂  and support the claim that at CI 95 % the means of the two groups differs

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