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Posted: March 15th, 2023
We use Excel to generate a Box to represents both the original and the corrected sets of data. The result is the following diagram:
The different methods of diagrammatic representation of statistical data are bar chat, histogram, steam and leaf, and lineplots. The bar chart is more appropriate to data from a discrete distribution that are summarised using a frequency distribution. A histogram is often used for representing data from a continuous variable which are summarised as a grouped frequency distribution. A histogram is therefore similar to a bar chat, but is used to present continuous data. Steam and leaf gives a visual representation similar to the histogram but has the advantage that it does not lose the detail of the individual data point in the grouping. All these diagrams serve to examine the general shape of the distribution of data and help in making conjecture about values of quantities such as the median, the mean or the interquartile range. The last one, the lineplot, is often appropriate for smaller data sets, and can be useful for example to check whether toe data sets have a common variance.
We denote by and
the mean of the original set and the corrected set respectively. Then we have:
i.e. .
i.e. .
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Since we have an even number of observation, the median in this case will be the midpoint of the two middle observations. That’s:
For the original set the median is ;
For the corrected set the median is .
The standard deviation of each data set is given by , where
,
are the different values in each data set. Hence:
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For the original set, , and for the corrected set
.
The lower quartile is defined to be the th observation counting from below, and the upper quartile is the same but counting from above. The interquartile is simply the difference between the upper and the lower quartile. We have the results in the following table.
Original set |
Corrected set Will My Use of This Service Stay Private?Yes, totally! We lock down your info with top-notch encryption—your school, friends, no one will know. Every paper’s custom-made to blend with your style, and we check it for originality, so it’s all yours, all discreet. |
|
Lower quartile |
3.815 |
3.7475 |
Upper quartile Do You Use AI to Write Papers?No way—our papers are 100% human-crafted. Our writers are real pros with degrees, bringing creativity and expertise AI can’t match. Every piece is original, checked for plagiarism, and tailored to your needs by a skilled human, not a machine. |
3.3925 |
3.3925 |
Interquartile |
0.4225 Why Choose You for Research Papers?We’re the best because our writers are degree-holding experts—Bachelor’s to Ph.D.—who nail any topic. We obsess over quality, using tools to ensure perfection, and offer free revisions to guarantee you’re thrilled with the result, even on tight deadlines. |
0.355 |
Question 2
Theoretically, the fact that 9 and 12 can be made up in as many ways as 10 and eleven 11 means that both sets of numbers should have the same probability to appear. The first thing that should be noted here is the fact that this is true if and only if when we throw a dice, all the numbers have the same probability of appearance, which if not always the case in practice when if when we need to allow consideration such as the on uniformity of the surface on which the dice is thrown, the angle and the velocity at which the is thrown, and even any deformation on the dice which all have an effect on the number that we will get. This problem thus highlights the impossibility of the probability to be an absolutely precise science as oppose to the other branches of mathematics.
Question 3
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.
Since all of all films are processed on machine X, then
.
is simply the probability the probability that we calculated above. Thus
. Hence:
.
Question 4
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At each question only two things can happen:
1-the student can answer the correctly, and we denote by the probability that this does happen;
2-or the student can choose the wrong outcomes among the five possible, and we denote by the probability that this does happen.
Obviously we must have . Given that only five outcomes are available at each question, only one of which being correct, we have
, and
.
The experiment that consists in answering a single question can therefore be viewed as a Bernoulli experiment with parameter . Hence, Taking all the multiple-choice examination can be viewed as Binomial experiment with parameter
, where
. Let’s
be the random variable representing the number of correct answer achieved by the student. Clearly, the distribution of
Binomial with parameter
. The probability that the student passes the test is the
, which is equivalent to
. But:
,
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where for each ,
.
Hence,.
This gives us , and thus the probability that the student passes the test is
.
Question 5
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Bayes’ Formula
Let E, F be subsets of some sample space S, and let Fc be the complement of F in S. We can express E as
because in order for a point to be in E it must be either in E and F or in E but not in F. As EF and EFc are mutually exclusive we can write
Applying this to the conditional probability equation gives .
Consider the following problem:
We have three boxes labelled U1, U2 and U3. Each of them contains a mix of white and red balls. The proportion of white balls is each of them is as follows: 30% for U1, 60% for U2, 40% for U3.
We draw one ball from U1; if it is a white ball then we draw a ball in U2, otherwise we draw a ball in U3.
We would like to find the probability that the first draw gives a red ball knowing that the second draw has given a given a white ball.
We denote by the event “the second draw is made in the box Ui”,
the event “the second draw gives a white ball”.
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Clearly, if the first draw gives a red ball, then the second can be made only in U3. Thus the probability that the first draw gives a red ball knowing that the second draw has given a given a white one is exactly the same as the probability that the second ball comes from U3 knowing that it is a white ball, which is nothing else than . Using the Bayes’ formula, we have
. (1)
It can be easily seen that and
are mutually exclusive as a the second draw can not happen in both U2 and U3 simultaneously. Also since the second draw can happen only either in U2 or U3, then
gives all the possibility on where the second draw can happen. That is why
.
The top of the fraction (1) is simply application of the conditional probability.
Hence:
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