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algol [13]
3 years ago
15

When looking at the percentage of patients whose symptoms were relieved after taking a placebo, a scientist sees a 20% success r

ate. The success rate of patients whose symptoms were relieved after taking a new composite drug was 30%. The scientist determines that the margin of error is 10%, which indicates that the new drug had no statistically significant positive effect. In which stage of the engineering process is this scientist?
A. Evaluating test results
B. Screening
C. Identifying a need
D. Looking for future improvements
Chemistry
1 answer:
9966 [12]3 years ago
6 0
A. Evaluating test results is your answer. Let me know if this is correct!
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What is the term for the limited recyclable life of certain materials? o single-stream recycling o closed-loop recycling O dual-
Orlov [11]

Answer:

There are three main types of recycling: primary, secondary, and tertiary.Single-stream recycling is a system in which all recyclables, including newspaper, cardboard, plastic, aluminum, junk mail, etc., are placed in a single bin or cart for recycling. ... While collections costs are lower with a single stream system, processing costs are much higher.

Explanation:

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4 0
3 years ago
Match each element to the number of electrons in its valence shell.
irinina [24]

Answer:

C: 4

H: 1

Mg: 2

O : 6

Explanation:

You can quickly find out the number of valence electrons by looking at where the element is on the periodic table and referring to the table that is attached.

6 0
1 year ago
What anions generally form precipitates? What are the exceptions?
8_murik_8 [283]

Answer:

Carbonates (CO3-2), phosphates (PO4-3) and sulfides (S-2) are insoluble.

The exceptions are the alkali metals and the ammonium ion.

6 0
4 years ago
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What is it called when two or more atoms combine and are held together 2 poin<br> by a chemical bond
Tamiku [17]

Answer:

Covalent bonds

Explanation:

7 0
3 years ago
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The density of helium is 0.17 g/L. What Is the mass of helium in a 5.4 L helium balloon? (2 sig figs) *
ioda

Answer:

The correct answer is 0.92 g

Explanation:

The density is defined as the mass per unit of volume:

Density= mass/volume

From the data provided:

volume= 5.4 L

density= 0.17 g/L

Thus, to calculate the mass of helium:

mass= density x volume = 0.17 g/L x 5.4 L= 0.918 g ≅ 0.92 g

6 0
3 years ago
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