Below is the meaning of each term and how each relates to the scientific method:
Variables can be understood as a concept that expresses a value, classification or measure in scientific research.Demand characteristics relate to the needs and interest in scientific research.Theory is the set of untested arguments that justify information.Experiment is a systematic way of exploring data and information, for the accomplishment of the scientific study.Data is a set of research records that serve as the basis for a scientific study.Hypothesis is an assertion about a research question, proposing an expected result.Case study is the explanation of real phenomena through the collection and demonstration of qualitative data.Dependent variable is the factor that changes in relation to the manipulation of the independent variable.Survey is a research method to collect qualitative and quantitative data and information that will inform the research.Naturalistic is a theory about the knowledge of the world and its phenomena explained through the scientific method.Design is the scientific method whose purpose is the development of products and services to enhance the human experience.Stimulus are items of different natures used to promote a reaction of the components of a scientific study.Independent variable is the variable manipulated in a scientific study for the purposes of analysis and observation.Control group are groups that serve as parameters for the results of a research, not being manipulated, only compared.Conclusion the final part of the work, the synthesis of the considerations found through the testing of the theory and hypothesis.Random a choice from a representative sample of a larger population in a study.What is scientific methodology?It is a set of methods and techniques structured and organized in a complex way to test a theory, find new concepts and knowledge through research, study, experimentation and analysis.
Therefore, the scientific methodology helps the development of society through the production of reliable and tested knowledge in order to assist in social and technological progress.
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in a clinical trial, 28 out of 888 patients taking a prescription drug daily complained of flulike symptoms. suppose that it is known that 2.8% of the patients taking competing drugs complain of flulike symptoms. is there sufficient evidence to conclude that more than 2.8% of this drug's user experience flulike symptoms as a side effect at the aplha 0.05 level of significance
The p-value (0.0001) is less than α = 0.05. Based on this, we should reject the null hypothesis.
What is a null hypothesis?A null hypothesis (H₀) can be defined the opposite of an alternate hypothesis (H₁) and it asserts that two (2) possibilities are the same.
How to calculate value of the test statistic?The test statistic can be calculated by using this formula:
[tex]t=\frac{x\;-\;u}{\frac{\delta}{\sqrt{n} } }[/tex]
Where:
x is the sample mean.u is the mean.is the standard deviation.n is the number of hours.For this clinical trial (study), we should use a t-test and the null and alternative hypotheses would be given by:
H₀: p = 0.028
H₁: p > 0.028
For the sample proportion, we have:
Sample proportion, P = 28/888
Sample proportion, P = 0.032.
Next, we would calculate the t-test as follows:
[tex]t=\frac{0.032\;-\;0.028}{\frac{0.02 \times 0.028}{888 } }\\\\t=\frac{0.004}{\sqrt{\frac{0.00056}{888 } }}[/tex]
t = 0.004/0.00079
t-test, t = 5.06.
For the p-value, we have:
P-value = P(t > 5.06)
P-value = 1 - P(t < 5.06)
P-value = 1 - 0.9999
P-value = 0.0001.
Therefore, the p-value (0.0001) is less than α = 0.05. Based on this, we should reject the null hypothesis.
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Serum cholesterol levels of 100 hypertensive patients were recorded. Mean cholesterol level was 190 mg/d1. The data was symmetrically distributed around the mean. Roughly 68% of the patients had serum cholesterol level between 175 mg/dl and 205 mg/dl. a. Calculate the standard error b. What will be the range of 95% confidence interval?
The standard error is 1.5.
The range of 95% confidence interval is 160 mg/dL and 220 mg/dL
What is the standard error of the distribution?The standard error of the distribution is calculated as follows:
Standard error = standard deviation/√Nwhere N is the number of participants = 100
From the empirical rule of a normal or symmetrical distribution;
68% of the data lies within one standard deviation95% percent within two standard deviations, and99.7% within three standard deviations from the mean.Therefore, 175 mg/dl and 205 mg/dl lie one standard deviation from the mean.
One standard deviation = 175 - 190 or 205 - 190 = ±15
Standard deviation = 15
a. Solving for the standard error using the equation above;
Standard error = 15/√100
Standard error = 1.5
b. The range of 95% confidence interval is two standard deviations away from the mean.
Range of values two standard deviations from the mean = 190 - (2*15) and 190 + (2 * 15)
Range of values two standard deviations from the mean = 160 mg/dL and 220 mg/dL
Therefore, the range of 95% confidence interval is 160 mg/dL and 220 mg/dL
In conclusion, the standard error is calculated from the standard deviation and the sample size.
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The sum of three numbers is 100. The second number is 2 times the third. The third number is 8 less than the first. What are the numbers?
Answer:
19, 54 and 27
Explanation:
54 is 2 times of 27 and 27-8=19
19+54+27=100
Before a site begins recruitment, a protocol monitor will conduct
a visit to review the data the research site has collected from
study participants.
Initiation visits occur before a study site begins participant recruitment for protocol participation and after the necessary IRB permissions are obtained. During a site initiation visit, study monitors review trial records to ensure that they are complete and in order.
What is Protocol Monitor?
The experimental Protocol Monitor displays the underlying requests and reactions happening over the DevTools protocol. For example, when considering some JavaScript via DevTools, observe the following notes on the protocol: Runtime.
How do I turn off Developer Tools on my phone?
You can disable the Developer options and hide the menu by opening Locations, and then tapping Developer options. Tap the switch at the top of the net to turn off Developer options.
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Consider an experiment of tossing two fair dice and noting the outcome on each die. The whole sample space consists of 36 elements. Now, with each of these 36 elements associate values of two random variables, X and Y, such that X≡ sum of the outcomes on the two dice, Y ≡ |difference of the outcomes on the two dice|. Construct joint probability mass function.
The joint probability mass function based on the given experiment is as seen in the attached file.
How to construct a joint probability mass function?
The whole sample space consists of 36 elements, i.e.,
Ω = {ω_ij = (i, j) : i, j = 1, ....6}
Now, with each of these 36 elements associate values of two random variables, X₁ and X₂, such that;
X₁ ≡ sum of the outcomes on the two dice.
X₂ ≡ |difference of the outcomes on the two dice|
That is;
X(ω_ij) = X₁(ω_ij) + X₂(ω_ij) = (i + j, |i - j|) i, j = 1, 2, ...., 6
Then, the bivariate rv X = (X₁, X₂) has the following joint probability mass
function (empty cells mean that the pmf is equal to zero at the relevant values of the rvs).
The joint probability mass function is seen in the attached file.
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r = 2.24 + 0.06x
p= 2.89 +0.10x
In the equations above, r and p represent the price per gallon, in dollars, of regular and premium grades of gasoline, respectively, x months after January 1 of last
year. What was the cost per gallon, in dollars, of premium gasoline for the month in which the per gallon price of premium exceeded
the per gallon price of regular by $0.93? Please explain thoroughly
Based on the equations of the price, the price of the premium gasoline, p = $3.59
What is the equation of the prices?An equation is an expression that describes two quantities as being equal.
The equation of the different prices of gasoline is given below:
Price of regular grade of gasoline, r = 2.24 + 0.06xPrice of premium grade of gasoline, p = 2.89 + 0.10xWhere x is the number of months after January 1 of last year.
When the per gallon price of premium exceeded the per gallon price of regular by $0.93, the two equations will be related as shown below:
p = r + 0.93 ---- (3)
r + 0.93 = 0.93 + 2.24 + 0.06x
r + 0.93 = 3.17 + 0.06x
Therefore, p = 3.17 + 0.06x --- (4)
Also, p = 2.89 +0.10 x --- (2)
solving for x by equating (1) and (4)
3.17 + 0.06x = 2.89 + 0.10x
0.10x - 0.06x = 3.17 - 2.89
0.04x = 0.28
x = 7
Then, substituting for x in (4)
p = 3.17 + 0.06 * 7
p = $3.59
In conclusion, the price of the premium gasoline is determined from the given equations of the price.
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bona has a stated reaction to a sound of a loud < >. immediately before the loud pop, a light flashes. after several times. Bona has started reaction to the flash of lighy. What is UCS? What is CR? What is NS? What is UCR?
The UCS is known to be the loud pop
What is CR?The CR is known to be a light flashes
What is NS?The NS is the reaction of bona
What is UCR?The UCR flash of light.
What is an unconditioned response?In classical conditioning, an unconditioned response is known to be that behavior that is said to be unlearned response that takes place as a sort of natural reaction to the unconditioned stimulus.
Hence, The UCS is known to be the loud pop.
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y = x² - 4x +3
y = x - 1
If (x, y) is a solution to the system of equations
above, what is one possible value of the product
of x and y?
Answer:
Possible values:
0 and 12
Explanation:
To solve the system of equations, let's set y = x^2 - 4x + 3 and y = x - 1 equal to each other to first solve for x.
x^2 - 4x + 3 = x - 1 (add one to both sides)
x^2 - 4x + 4 = x (subtract x from both sides)
x^2 - 5x + 4 = 0
Next, we simply factor the expression. -1 and -4 add up to -5 and multiply to 4, so the factored expression looks like this:
(x - 1)(x - 4) = 0
x = 1 and x = 4 are both solutions to the factored equation. Now, let's plug the values back in to both equations.
(1)^2 - 4(1) + 3 = 0
(4)^2 - 4(4) + 3 = 3
(1) - 1 = 0
(4) - 1 = 3
When 1 is plugged into either equation, 0 is the value of y. For 4, 3 is the value of y. The possible values of product of x and y are below:
0 * 1 = 0
4 * 3 = 12
Brainliest, please :)
The best way to think about examinations and assessments is that:
A. they point out your failures.
B. they point out what you don't know.
C. they are a learning tool for judging yourself.
D. they are a tool for others to judge you and your mistakes.
Answer:
D
Explanation:
They are a tool for others to judge you and your mistake
Answer:
C. They are a learning tool for judging yourself
Explanation:
Examinations and assessments aren't meant to point out your failures or show what you don't know because not everyone makes mistakes on tests and exams, and if they do, those mistakes could have very well been careless. They also aren't a tool for others to judge you and your mistakes because no one is perfect, and people should judge you based on your overall personality and actions, not your test scores.
C is correct because tests and exams are a learning tool... If you do miss anything, you can refer back and study them to prepare for the next test or review what you missed. They allow you to judge yourself by letting you look at where you are now and compare it to where you should be in a healthy way.
Hope this helps! Brainliest, please :)
A bag contains only red, blue, and green marbles. There are a total of 20 marbles in the bag, and the probability of NOT selecting a blue marble is ¼. How many blue marbles are in the bag?
Based on the calculations, the number of blue marbles in this bag is equal to 15 blue marbles.
Given the following data:
Total number of marbles = 20 marbles.Probability of not selecting a blue marble = ¼.How to calculate the number of blue marbles?In this exercise, you're required to calculate the number of blue marbles considering the fact that the probability of not selecting a blue marble from this bag is ¼.
First of all, we would determine the probability of actually selecting a blue marble from this bag as follows:
Probability = 1 - nP(B).
Probability = 1 - ¼.
Probability = ¾.
Now, we can calculate the number of blue marbles:
P(B) = total number of blue marbles/total number of marbles
¾ = B/20
4B = 60
B = 60/4
Blue marbles, B = 15 blue marbles.
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Answer: 15 marbles
Explanation:
The probability of NOT picking/selecting a blue marble is 1/4. 1/4 of 20 is 5, which means that 5 marbles aren't blue. That leaves 15 marbles, which means that there is a 3/4 probability of selecting a blue marble from the bag (3/4 of 20 is 15).
Therefore, our desired answer is 15 marbles.
A manufacturer of potato chips would like to know whether its bag filling machine works correctly at the 426 gram setting. Based on a 13 bag sample where the mean is 433 grams and the standard deviation is 29, is there sufficient evidence at the 0.05 level that the bags are overfilled? Assume the population distribution is approximately normal.
The conclusion of the research is that we reject the null hypothesis and we conclude that the bag filling machine does not work correctly at the 426 gram setting.
How to solve hypothesis testing?We are given;
Population Mean; μ = 426
Sample mean; x' = 433
Sample size; n = 13
Standard deviation; s = 29
significance level; α = 0.05
Let us define the hypotheses;
Null Hypothesis; H₀: μ = 426 g
Alternative Hypothesis; H_a: μ < 426 g
Formula for the z-score here is;
z = (x' - μ)/(s/√n)
z = (433 - 426)/(29/√13)
z = 0.87
From online p-value from z-score calculator, we have;
p-value = 0.1922
This p-value is greater than the significance value and as such we reject the null hypothesis and we conclude that the bag filling machine does not work correctly at the 426 gram setting.
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Listed below are body temperatures from five different subjects measured at 8 AM and again at 12 AM. Find the values of d and s.. In general, what does
represent?
Temperature (°F) at 8 AM 98.4 98.7 97.5 97.3
97.1
Temperature (°F) at 12 AM 99.0 99.3 97.9 96.9 97.5
Let the temperature at 8 AM be the first sample, and the temperature at 12 AM be the second sample. Find the values of d and s..
d=
(Type an integer or a decimal. Do not round.)
The mean of the temperature based on the information given is -3.2.
How to calculate the mean?The difference in the temperature based on the information will be:
98.4 - 99.0 = -0.6
98.7 - 99.3 = -0.6
97.5 - 97.9 = -0.4
97.3 - 96.9 = 0.4
97.1 - 97.5 = -0.4
Total = -1.6
The mean will be:
= -1.6/5
= -3.2
Also, the standard deviation is 2.8. This simony illustrates how spread the numbers are in the information given.
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