Recent questions in Descriptive Statistics

Z-Scores
Answered

Lilliana Livingston
2022-07-20

Bar Graphs
Answered

stratsticks57jl
2022-07-19

I am trying to solve the following problem:

Let G be a nonempty graph with the property that whenever $uv\notin E(G)$ and $vw\notin E(G)$, then $uw\notin E(G)$. Prove that G has this property if and only if G is a complete k-partite graph for some $k\ge 2$. (Consider $\overline{G}$).

The converse is straightforward and is given by the definition of the complete k-partite graphs, however, the direct way is not trivial and I could not get it.

Z-Scores
Answered

Javion Henry
2022-07-19

in and standard deviation 2.4

in. A branch of the military requires women's heights to be between 58 in and 80 in. a. Find the percentage of women meeting the height requirement. Are many women being denied the opportunity to join this branch of the military because they are too short or too tall? b. If this branch of the military changes the height requirements so that all women are eligible except the shortest 1% and the tallest 2%, what are the new height requirements?

a) The percentage of women who meet the height requirement is:

The website says I am supposed to use $\frac{z-\lambda}{2.4}$

doing so gives me $\frac{16.6}{2.4}=7.086$ This value literally is useless. What am I doing wrong?

Z-Scores
Answered

Luciano Webster
2022-07-19

4) When normal scores are transformed into z-scores, the resulting z-scores will have a mean of (0, 1 ).

5) For a normal random variable, the probability of observing a value less than or equal to its mean is (0,0.5, 1).

Z-Scores
Answered

Libby Owens
2022-07-19

Z-Scores
Answered

Parker Bird
2022-07-19

By using the cumulative (to the left) Z score table,

a) find the probability that the system downtime is more than 5 sec.

z score = (n-$\mu $)/ $\sigma $

= (5-4.47)/0.38

= 1.39

the probability for 1.39 in the z score table is 0.9177

so, P(x$\le $5)= 0.9177

P(x>5)= 1- 0.9177

= 0.0823

b) what is the minimum downtime duration for the worse 5% ?

(i already got the answer for a, i just don't quite understand the meaning of 'for the worse 5%' )

Z-Scores
Answered

Paxton Hoffman
2022-07-18

Using the standard score formula, $z=(x-\mu )/\sigma $, the z-score equals to two decimal places 1.64, which corresponds to a probability of 0.9495 on my z-score tables. However, on the answer key provided, it states the probability is 0.0505 or what would correspond to a z-score of −1.64.

Is this a trick of the wording involved in the question or are my z-tables (or standard score formula) wrong?

Effect Size
Answered

Ruby Briggs
2022-07-18

a.That there is a small effect size

b. That there is a medium effect size

c. That there is a large effect size

d. That there is no effect size at all

Effect Size
Answered

Haley Madden
2022-07-18

a. the effect size is bigger when the two populations overlap more.

b. The effect size is NOT affected by the differences between means.

c. Standard effect size is always positive, because it is figured using the square root.

d. The effect size is bigger when the standard deviation of population gets smaller.

Z-Scores
Answered

anudoneddbv
2022-07-17

Z-Scores
Answered

owsicag7
2022-07-17

The player's height is [_] standard deviation(s) above the mean. (Round to two decimal places as needed.)

Z-Scores
Answered

Mauricio Mathis
2022-07-17

Z-Scores
Answered

Avery Stewart
2022-07-17

Z-Scores
Answered

Matias Aguirre
2022-07-16

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

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