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Natashia L.
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Medicine
TutorMe
Question:

What is the ventricular system in the human brain, and what are its anatomical borders?

Natashia L.
Answer:

>Ventricular system - composed of 2 lateral ventricles, the third ventricle, the cerebral aqueduct,and the fourth ventricle; the ventricles of the brain are a communicating network of cavities filled with cerebrospinal fluid (CSF) and located within the brain parenchyma >Each lateral ventricle is divided into a central portion, and 3 lateral horns of the ventricles. The central portion of the ventricle is located within the parietal lobe. The roof is formed by the corpus callosum, and the posterior portion of the septum pellucidum lies medially. The anterior part of the body of the fornix, the choroid plexus, lateral dorsal surface of the thalamus, stria terminalis, and caudate nucleus, form the floor of the lateral ventricle.

Psychology
TutorMe
Question:

Hi, I'm doing a research project for my final year in Psychology. I would need help with the results section of my report (stats). The measures I used: age, sex, Big5 (although my hypothesis assumes I'd only need the Openness), artistic experience/fashion experience (do you get goosebumps when you see a piece of art, do you feel like crying when experiencing a fashion item? - these were a measure of the 'aesthetic chills' - people high in openness would experience these more), perfectionism, narcissism and Art Reception Survey (2 paintings: one classic, second abstract, 2 fashion items: one classic/useable, second abstract) ARS is basically a scale when you choose how much you like the item. From my research I know that: Openness correlates with creativity and aesthetics appreciation/aesthetic chills. Creativity correlates with narcissism and perfectionism. The mirror model of art assumes the creativity processes and art appreciation processes are the same. I want to see if the narcissism and perfectionism do correlate with art appreciation and aesthetic chills. First of all, I think I should check if my data gives me similar results as from other research. (?) Should I first measure if Openness correlates with art appreciation and aesthetic chills? Then I want to see if Perfectionism and Narcissism correlate with Art appreciation and Aesthetic chills for all four: two paintings and two fashion designs. I also need to see if the Fashion designs can be seen as piece of art (measure by aesthetic chills AND ARS). Then I would like to check how two pieces of abstract art correlate with each other, i.e. Kandinsky painting and water dress (both stimuli I used), is one more likely to be appreciated? I'd like to do the same comparison with classical painting and black dress, then with two paintings and then with two dresses. Expected results I have submitted: Narcissism and perfectionism would correlate with art appreciation and aesthetic experience Both fashion designs would score lower on aesthetic experience and art appreciation than either of the paintings High narcissism would correlate with higher scores on fashion designs. Please help me as I don't really know what statistic tests to use and how to correctly report them!

Natashia L.
Answer:

So let's start by helping you get a little more organized about what you are trying to study, and what hypotheses you are actually testing. It sounds like prior research has established a connection between openness and creativity , while creativity has been linked with narcissism and perfectionism. This helps lead to your first 2 research questions: Q1: is openness correlated with narcissism ? Q2: is openness correlated with perfectionism? Additionally, you said that prior research has showed a connection between openness and aesthetics appreciation/aesthetic chills. If this was demonstrated by prior research in you literature search, there is no need to replicate it, unless you choose to. However, if you are actually wondering if Perfectionism and Narcissism correlate with Art appreciation and Aesthetic chills, then your follow up research questions are: Q3: Is narcissism correlated with Art appreciation and Aesthetic chills? Q4: Is Perfectionism correlated with Art appreciation and Aesthetic chills? Q5: Is the presence of Perfectionism and narcissism in the same individual, correlated with Art appreciation and Aesthetic chills? Now the way you would test these questions, in most of the above questions is using a pearson correlation, to see if increases in one score correlate with increases in the other. You can use this test for research questions 1-4. Remember, you null hypothesis is always that no correlation exists. If your test finds a significant correlation at the level of alpha that you set, that will indicate that you can reject the null hypothesis, and that the is indeed a correlation between the two variables. As for question 5, you need to clarify how you are quantifying/measuring aesthetics appreciation/aesthetic chills. Is it one score, or 2 scores? if it is one score the above mentioned analysis can be done as described comparing that score to the score for openness, etc. But if it is 2 scores, you need to compare it individually. So as for question 5, since its looking at how aesthetics appreciation/aesthetic chills correlate with the combination of narcissism and perfectionism, the test you use depends on how you are measuring the variable. If you are treating narcissism and perfectionism as merely being present vs not present, then you can compare the group of people for which both are present , to the group that does not have both, with regards to aesthetics appreciation/aesthetic chills. You also mentioned that you want to evaluate the subjects for 4 different pieces of art. The simplest way is to use a correlation test to see if the narcissism scores correlate with experience scores for each of the pieces individually. Unless you chose to create a composite score of the response to all 4 pieces and use that for your correlation. for the comparison between two abstract pieces you compare the appreciation scores for one with the scores for the other and again use pearson correlation. I hope this helps you to plan your statistics analysis and how you choose to evaluate each variable. Once you have made some of these decisions and have your data ready, if you need help performing and interpreting the actual analyses, I can help you in another lesson. Please let me know if you have any questions.

Statistics
TutorMe
Question:

A dealership has 50 cars, and 10 of the cars are white. 5 cars were sold today. What is the probability that exactly 2 white cars were sold today?

Natashia L.
Answer:

You want to look at the hypergeometric distribution which is sampling without replacement. If N describes the number of all cars and K describes the number of white cars, then N − K corresponds to the number of non-white cars. X is the random variable whose outcome is k, the number of white cars actually sold. Sold not sold total White cars k K − k K Non-white cars n − k N + k − n − K N − K total n N − n N the probability of selling a white car on each trial is not the same, as the size of the remaining population changes as we remove each car. This problem is summarized by the following contingency table: Sold not sold total White cars k=2 K – k=8 K=10 Non-white cars n – k=3 N + k − n – K=37 N – K=40 total n= 5 N – n=45 N=50 The probability of selling exactly k white cars can be calculated by the formula Hence, in our problem, calculate: P(X=2) =f(2;50,10,2) = (10! / 2!*8!)(40! / 3!*37!) / (50!/ 5!*45!)

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