Recent questions in Descriptive Statistics

Bar Graphs
Answered

Damien Horton
2022-07-16

Let us denote by χ(G) the chromatic number, which is the smallest number of colours needed to colour the graph G with n vertices. Let $\overline{G}$ be the complement of G. Show that

$\chi (G)+\chi (\overline{G})\le n+1$

$\chi (G)\chi (\overline{G})\ge n$

I was able to prove (a) using induction. Any hints on proving (b)?

Types Of Variables
Answered

ingwadlatp
2022-07-16

Bar Graphs
Answered

Jayvion Caldwell
2022-07-16

The question is:

A scientist collects data. He determines both the mean of the data and the median of the data are equal to 7 and the data are symmetrical about this value. He starts to create a bar graph shown, but does not finish the graph.

If the range of the data is 8 and the maximum value of the data is 11, then how many data points fall above the value 7?

The answer is 14, but I don't know how this is the answer.

Z-Scores
Answered

Aleah Booth
2022-07-16

Z-Scores
Answered

Emmanuel Pace
2022-07-16

Z-Scores
Answered

Luciano Webster
2022-07-16

Meta-Analysis
Answered

Logan Wyatt
2022-07-16

Meta-Analysis
Answered

gaiaecologicaq2
2022-07-16

I'm a first year student who changed his major to applied mathematics. In middle school I was a garbage math student, but I realized the importance of math in high school when I was introduced to amazing teachers who truly loved what they did. I put myself in tougher classes and eventually got to AP calculus. There was an error in my idea, I never really got a deep understanding of the stuff I was doing and was struggling since I didn't understand the basics and never really did practice problems.

This year I began to start over from scratch from pre-algebra working to pre-calculus. Even though I have already took Calculus.

I'm in a introduction to research class this semester and we are preforming a meta-analysis of some random topic and then presenting at the end of the semester. I'm really enjoying it, and I will definitely apply for more research as I progress through my undergraduate career. (Urge to Compute)

I know I'll probably never win a field's medal, but I'm really intimidated and humbled by the near perfect SAT math scores and Math Olympiad participants.

It's too late for me to have that, but the best quality I have is sticking with the concepts and problems until I can explain them to my dog. (Basically until I understand it)

I'm really sorry for the long post / soft question, I've just been thinking about this since 11th grade but never asked anyone about it.

Basically I'm just wondering if I'm wasting my time, and if there have been mathematicians that were in a similar situation. (Famous or not.)

Again, sorry for the soft question and thank you for taking the time to read this!

Z-Scores
Answered

vangstosiis
2022-07-16

Z-Scores
Answered

Roselyn Daniel
2022-07-16

Z-Scores
Answered

suchonosdy
2022-07-16

Types Of Variables
Answered

Riya Hansen
2022-07-15

Meta-Analysis
Answered

kislotd
2022-07-15

a. A meta-analysis on the effect of the drug ibuprofen on the frequency of individuals contracting kidney disease.

b. A meta-analysis of whether excluding parasites from a population affects mean growth rate.

c. A meta-analysis of the association between human height and life span

d. A meta-analysis comparing the survival of parasitized and unparasitized birds.

e. A meta-analysis comparing the difference in body size of males and females across species.

Mode
Answered

Keenan Santos
2022-07-14

Also, is every point mode as PDF has highest values there? So there are $n$ modes - $1,2,\dots ,n$?

Types Of Variables
Answered

kominis3q
2022-07-14

Z-Scores
Answered

Lorena Beard
2022-07-13

On average, $30\mathrm{\%}$ were further than ___ kilometers away when they had their accident.

Is $30\mathrm{\%}$ a z-score or is it a mean? Transport Canada was investigating accident records to find out how far from their residence people were to when they got into a traffic accident. They took the population of accident records from Ontario and measured the distance the drivers were from home when they had their accident in kilometers (km). The distribution of distances was normally shaped, with $\mu =30$ kilometers and $\sigma =8.0$ kilometers.

Meta-Analysis
Answered

Willow Pratt
2022-07-13

(A) $(\frac{\sqrt{3}-1}{2\sqrt{2}},\frac{\sqrt{3}+1}{2\sqrt{2}})$

(B) $(\frac{\sqrt{3}+1}{2\sqrt{2}},\frac{\sqrt{3}-1}{2\sqrt{2}})$

(C) $(\frac{\sqrt{3}+1}{2\sqrt{2}},\frac{1-\sqrt{3}}{2\sqrt{2}})$

(D) $(-\frac{1}{2},\frac{\sqrt{3}}{2})$

If $P$ and $Q$ are the end points of the diameter, it is quite clear that the equation of the circle must be

$$

Therefore, all the vertices must lie on this circle. Now, checking from the options, we find that every point given in the options satisfies the above equation. Now I am stuck.

How else should I tackle the sum?

Z-Scores
Answered

lilmoore11p8
2022-07-13

I have done a lot of research into the question and eventually broke down and used the standard table. The answer I got through that was a std of 21.387.

I know I need to use the z score formula (x-mean)/std = z but I am searching for two of those variables and would need the z score at least to find the std.

A push in the right direction would be greatly appreciated.

When you are majoring in subjects like Engineering, Sociology, or Economics, the chances are high that you will require descriptive statistics help, which basically stands for those cases when you need to provide more than calculations or statistical data that is presented in numbers. You may also require general help with the equations, which is why the list of answers presented will help you to proceed with your challenges. You can start with the bar graphs example We also list several descriptive statistics examples that will make it easier to understand how this part of statistics and probability works. In case you need to provide a