What is the difference between an observational study and an experiment
Answer: In observational study observer has no control on the variables but in an experiment experimenter has control over the independent variable to record the change on the dependent variable.
In statistics , an observational study is a study in which a researcher just observe effects on subjects in a certain manner without interfering them.
On the other hand an experiment is a process which is done by experimenter to demonstrate a known fact or create a discovery by applying some methods to the variables .
The basic difference between an observational study and an experiment is in observational study observer has no control on the variables but in an experiment experimenter has control over the independent variable to record the change on the dependent variable.
in an observational study, the researchers do not control treatment, and in an experiment, they do (B)
A train leaves a station at 10:40 a.m. and arrives at its destination at 1:20 p.m. Find the distance between the stations if the average speed of the train was 60mph
Plastic cups comes in an 10-pack, but paper plates come in a 12 pack. What is the smallest number of plastic cups and paper plates you can purchase if you want to have the same number of each for an upcoming BBQ?
A mixture of alcohol and water contains a total of 60 oz of liquid there are 12 oz of pure alcohol in the mixture was a percentage of the mixture is water what is the percent alcohol
The mixture contains 80% water and 20% alcohol.
Total Amount of mixture = 60 oz
Amount of alcohol in the mixture = 12 oz
We need to find the percentage of water and percentage of alcohol in the mixture.
First we will find the amount of water in mixture.
Now we know that;
Total Amount of mixture is equal to sum of Amount of alcohol in the mixture and amount of water in mixture.
so we can say that;
amount of water in mixture = Total Amount of mixture - Amount of alcohol in the mixture
amount of water in mixture =
Now we will find the Percentage amount of water.
Percentage amount of water can be calculated by dividing amount of water in mixture by Total Amount of mixture and then multiplying by 100.
framing in equation form we get;
Percentage amount of water =
Percentage amount of alcohol =
Hence The mixture contains 80% water and 20% alcohol.
11z/16+7z/8=5/16 how do you get the z alone?
There are 160 boys and girls playing in the soccer tournament. 32 of the students are wearing orange. What percent of the players are wearing orange?
In a new york state daily lottery game, a sequence of four digits (not necessarily different) in the range 0-9 are selected at random. find the probability that three of the four digits are the same.
The probability that three of the four digits are the same in the lottery number is 0.036.
Total number of ways of arranging the 4 digits to make a lottery number is .
According to the question, three digits should be the same.
So, number of ways of arranging three same numbers in the lottery number of 4 digits is
Hence, the probability that three of the four digits are the same in the lottery number is
Learn more about probability here:
The graph shows a logarithmic function f. What do f and the function g(x) = log6x have in common? Select all that apply.
A B C
Just did it on EDG2020
A B C
Did on e2020
A square scarf is folded in half to form a rectangle. if the resulting rectangle has a perimeter of 15 inches, what are the area and perimeter of the square scarf?