Heat is released when a substance changes from a gas to a liquid, or from a liquid to a solid.
When a liquid changes to a solid, we refer to that as the process of 'freezing'.
The correct answer is Only (A) and (C) are true
Explanation:
In a study or research, the control group is the one that does not receive a treatment. This means, in this case, the control group includes those who only drink the green tea without the herbs because they serve as a standard to measure the effects of the herbs. This makes statement A (The "only green tea" group serves as the control group) true; also, the group receiving the herbs is the experimental group.
On the other hand, a double-blind study is one in which the researchers and the participants ignore who is receiving the treatment, which guarantees there is objectivity. This occurs in the study presented because neither the researcher nor the subjects known who received the herbal mix. Thus, statement C (This study is double-blind) is true.
Finally, a study is classified as observational if there is not intervention but the researchers just observe participants to study a phenomenon. This does not occur in the study presented because there is an intervention through the herbal treatment, and therefore the study is not observational.
harry should add $20 per pound
The method of identifying the advantages and disadvantages of various options by looking at the incremental impact on total revenue and total cost caused by a very modest change in the value or input of each alternative (just one unit). Instead of making decisions based on totals or averages, marginal analysis encourages those that focus on small or gradual changes to resources. Examining the costs and possible gains of particular business operations or financial choices is known as marginal analysis. The objective is to ascertain whether the benefits from the change in activity will be great enough to outweigh the costs.
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Answer:
W = $27.34
Explanation:
Given data:
Percentage Decline in average income is = 2%
CPI in 1990 1.30
CPI in 2000 is 1.69
Average nominal wage is 2000 is $35
Inflation rate is given as
Inflation rate = % Change in CPI
= (1.69 / 1.3) - 1
= 1.3 - 1 = 0.3 = 30%
Real wage = Nominal wage / Price level, hence
Percentage change in real wage = % Change in (nominal wage - inflation rate)
-2% = % Change in nominal wage - 30%
% Change in nominal wage = 28%
let nominal wage in 1990 is w
W\times 1.28% = $35
solving for W = $27.34
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