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agasfer [191]
3 years ago
14

Please help. What is the value of the expression when a = 3 and b = 2?     3a^3 + 2b^3

Mathematics
1 answer:
algol [13]3 years ago
8 0
The answer is B. 97 3 x 27 + 2 x 8
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Day care centers expose children to a wider variety of germs than the children would be exposed to if they stayed at home more o
Ostrovityanka [42]

Answer:

a) The study is an observational study

b) The proportion of children with significant social activity in children with acute lymphoblastic leukemia is approximately 0.802

The proportion of children with significant social activity in children without acute lymphoblastic leukemia is approximately 0.8565

c) The odds ratio is approximately 0.6780

d) The 95% CI is approximately 0.523 < OR < 0.833

e) i) Yes

ii) Children with more social activity have a higher occurrence of acute lymphoblastic leukemia

Step-by-step explanation:

a) An experimental study is a study in which the researcher adds inputs to the study and then monitors the outcomes

An observational study is one in which the researcher observes risk factors and does not intervene in the process

Therefore, the study is an observational study

b) The proportion of children with significant social activity in children with acute lymphoblastic leukemia is \hat p_1 = 1020/1272 = 85/106 = 0.8\overline {0188679245283} ≈ 0.802

The proportion of children with significant social activity in children without acute lymphoblastic leukemia is \hat p_2 = 5343/6238 ≈ 0.8565

c) We have the following two way table;

\begin{array}{ccc}Lymphoblastic \ Leukemia &With \ Social \ Activity & Without \ Social \ Activity\\With&1020 \ (a)&252 \ (b)\\Without&5343 \ (c)&895 \ (d) \end{array}

The \ odds \ ratio = \dfrac{1,020 \times 895}{5,343 \times 252} \approx 0.6780

The odds ratio ≈ 0.6780

d) The 95% confidence interval for the odds ratio is given as follows;

95 \% \ CI = OR \ \pm \ 1.96 \times \sqrt{\dfrac{1}{a} +\dfrac{1}{b}+\dfrac{1}{c}+\dfrac{1}{d}}

Where;

a = 1020, b = 252, c = 5343, d = 895

Therefore;

95 \% \ CI \approx  0.6780 \ \pm \ 1.96 \times \sqrt{\dfrac{1}{1,020} +\dfrac{1}{252}+\dfrac{1}{5,343}+\dfrac{1}{895}} \approx 0.678 \pm0.155

The 95% CI ≈ 0.523 < OR < 0.833

e) i) Given that the observed Odds Ratio is within the Confidence Interval, therefore, there is an indication that the amount of social activity is associated with acute lymphoblastic leukemia

ii) Based on the proportion of the study findings, children with more social activity have a higher occurrence of acute lymphoblastic leukemia

6 0
2 years ago
A recipe uses 5 cups of milk to make 10 servings. If the same amount of milk is used for each serving, how many servings can be
kodGreya [7K]
16 servings

because there are 4 cups in a quart, and two quarts is 8 cups.. if 5 cups of milk makes 10 servings there is half a cup in each serving.. so 8/.5 is 16
4 0
3 years ago
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Find the equation of the linear function. In slope intercept form
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Good job oh my God you are so smart oh my God a good job bro
8 0
2 years ago
Which function is best represented by this graph ​
zavuch27 [327]

Answer:the potato is ugly

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Aminer started at 8 feet above sea level
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Answer:

-15 ft or 15 ft below sea level

Step-by-step explanation:

He started at +8 ft.

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8 ft + (-23 ft) = 8 ft - 23 ft = -15 ft

Answer: -15 ft

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3 years ago
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