# Questions tagged [descriptive-statistics]

The area of statistics that provides descriptions of data, may it be samples or the population. This includes graphical representations and numerical indicators. No information is inferred from samples about the population, as in inferential statistics.

400 questions
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### Are all numbers in (20;30] 50th percentiles and medians of set of numbers {10,20,30,40}?

(Here I implicitly use the exclusive definition of a percentile) Let’s assume that we have following set of numbers: {10,20,30,40}. The median of this set is the mean of 20 and 30, namely 25. But ...
0answers
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### link function interpretation for models

In the categorial regression using the logit link function, the estimated coefficients are used to calculate the odds ratios or the ratio between two odds, that is, the model is interpreted through ...
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### How to infer the underlying distribution of a statistic (Bayesian inference?)

I have a list of approximately 30,000 venues in a major US city. These venues hold all kinds of events, sports, conferences, concerts etc. I want to know the distribution of the 'capacity' of these ...
1answer
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### How does inverting data change standard deviation?

This seems like such a straightforward question but, after googling the title of this question and variations thereof, I haven't been able to find an answer. Please point me in the right direction if ...
1answer
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### Conditional probability question about children

Sushma has $2$ children. Let $A$ be the event that the oldest child is a girl, $B$ be the event that at least one child is a girl, and $C$ be the event that both children are girls. Which of the ...
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### Yule's coefficient of association

If with usual notations for two attributes the inequality (AB)(αβ)<(Aβ)(αB) holds, then -1 ≤ Q ≤1 is true? According to me the answer is false because in the given condition either A or B are ...
0answers
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### Yule's Coefficient condition

If with usual notations for two attributes the inequality $(AB)(\alpha\beta)<(A\beta)(\alpha B)$ holds, then $-1 \leq Q \leq 1$ is true. According to me the answer is false because in the given ...
0answers
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### Value of Correlation coefficient

Suppose a computer has found for a given set of values of X1, X2 and X3: r12=0.90, r13=0.30 and r23=0.70. Examine whether these computations are error free. I used partial correlation coefficient to ...
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### boxplot analysis

Similar boxplots with different quantity of outliers I have boxplots (shown on picture) and in my homework I should decide which statement about them is right. They are: 1) 1st set - fewer outliers ...
0answers
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### Estimating population size of endangered parrots

I am trying to find the best way to analyse the results of a study I have just coordinated. In short, I want to be able to estimate the total population size of a species of parrot based on ...
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### Independence of sample mean and sample variance

It is well known that under normality assumption, the sample mean and sample variance are independent, by Basu's Theorem. My question is that, is the normal distribution the only distribution whose ...
2answers
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### Real Examples of Misleading Statistics

I need to give a presentation to a group of students on Tuesday about why one needs to be careful when examining statistics or mathematical results in the media or online. In his book How Not To Be ...
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### How to graphically visualize how well a copula fits a sample of pseudo observations?

I have a bivariate data sample $(a, b)$ which I would like to model with a joint distribution $(A, B)$. I fitted the marginal distributions for $A$ and $B$, however, the samples $a$ and $b$ are not ...
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### Express $x_{n+1}$ in terms of $n,\bar{x},s^2$.

Consider a set of $n$ observations {$x_1,...x_n$}, with mean $\bar{x}$ and variance $s^2$.When a new observation $x_{n+1}$ is added to this set,the mean decreases,but the variance remains the same....
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### How may a bivariate and univariate hypothesis test be useful for this data set?

If anyone can assist, I'll greatly appreciate it So my main research question is on government views (if people approve or disapprove of the government) and it's relationship to education policy (...
2answers
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### The “correct” standard deviation

This may end up being a question more about scientific best practice than anything else, but I think this is the right community to ask it in to get the insight I'm looking for. Say I have two little ...
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### Probability and Statistic

I have a question about how to calculate the confidence interval. The problem is: I have a model which gives the probabilities of 4 genotypes AB, Ab, aB and ab as (1/4)(2 + theta), (1/4)(1 - theta), (...