sinav

201問 • 1年前

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The variance of an alternative feature is determined by the formula:

σ2 = pq

If there are 450 men and 550 women per 1000 people of the district's population, then the variance of the alternative attribute is:

0.2475

The share in the general population is determined by the formula:

p=n/N

Nonparametric test for comparing dependent samples...

T-Wilcoxoncriterion

Indicate the relative values:

the number of men per 1000 women is 895

Based on the data on the incidence of influenza in each region of the country, it is necessary to determine the average incidence of influenza throughout the country. What kind of medium should you apply:

harmonic mean

In the which distribution the arithmetic mean, mode and median will be equal

With normal distribution

What does the term "accept a hypothesis" mean?

The results of scientific observations do not contradict the original assumptions

What kind of graphs of distribution series are used to represent interval variation series?

Histogram

The number of cases of morbidity with a specific disease has changed relative to the year,%: in 2009 - 79%; 2010 - 82%; 2011 - 87%; 2012 - 96%. The average monthly rate of change in incidence can be calculated using the average formula:

geometric

Which of the given formulas determines the value of the total variance?

Dtotal = Dbetween + Dwithin

For a random error m = 0.966 with a probability of P = 0.95, determine the boundaries of the confidence interval

∆ ≈ ± 2

What is the main task of the analysis of variance?

Identification of the influence of factors that determine the variability of the trait

When deciding on the organization of the sample, what statistical characteristic is considered a criterion?

Sampling error

What are the boundaries in which the general characteristic can be located with a given probability?

Confidence interval

What is the name of the ability of the sample to assess the general population?

Representativeness

What is the correlation coefficient if the relationship is not close?

r → 0

Give a definition of the linear correlation coefficient indicator...

meter of the tightness of communication with a straight line dependence

What is the name of the average value that falls in the middle of the variation series?

Median

A number of nonparametric criteria are also called...

ranked

With the help of what kind of graphs of the distribution series depict discrete variation series?

Polygon

What are the main elements of statistical distribution series.

options, frequency

What is the statistical characteristic of the center of frequency distribution in the distribution row?

Arithmetic mean

If the variance of the sample is reduced by 4 times, then the standard error of the sample...

will decrease by 2 times

The rule for adding variances is that….

the total variance is equal to the sum of the between-group and within-group variances

The change in the values of the attribute in the units of the population in space or in time is called….

variation

What symbol usually denotes the standard deviation?

The standard deviation is calculated as….

square root of variance

The degree of closeness of the relationship between indicators can be measured by:

correlation coefficient

The following methods of analysis are used to study statistical relationships:

correlation

The statistical feature is….

distinguishing feature between units of the population

The essence of the statistical grouping is….

dismemberment of the general population of units according to certain criteria

Depending on the type of initial data, the average value can be of the following types:….

Arithmetic, Harmonic, Cubic, Geometric

For the calculation of the average, the weighted average formula is applied if the statistics….

grouped

The average is

characteristic feature

Variantis…

unit of the variation series

Under what conditions, the arithmetic mean most accurately characterizes the average level of the variable

in a normal distribution with a sufficiently large number of observations and the homogeneity of the phenomenon under study

In what limits can the value of the correlation coefficient fluctuate?

from -1 to +1

What does the size of the sample depend on?

on the value of the standard error and the degree of homogeneity of the studied phenomenon

The median of the series (Me) is

center variant, halving the row

Mode is

variant, which occurs more often than others

With an increase in the number of observations, usually the value of the average error

decreases

Within what boundaries are random fluctuations of the average value of the general population possible with a probability of 95.0%?

М±m

What degree of probability corresponds to the confidence interval P ± mp?

95.0% probabilities

What degree of probability corresponds to the confidence interval P ± mp?

95.0% probabilities

To reduce the sampling error, the number of observations must be

enlarge

The smaller the number of observations, the larger the average error

Not considered reliable for scientific research

68.3% probability

The correlation coefficient between the incidence rate of the population and the rate of hospitalization for cardiovascular pathology per 1000 surveyed urban population is r = + 0.28 (p <0.001). Is it possible to draw the following conclusion based on the value of this coefficient

addiction - direct and strong

A feature is called qualitative if it

is taken into account according to the presence of its properties among members of the studied group

Dispersion is called

measure of the spread of a random variable

The standard deviation is called

the root-mean-square indicator of the deviations of the values of the attribute from the arithmetic mean in the aggregate

Samples by their size are:

relatively small

To assess the relationship of qualitative characteristics, one should use

χ2 test

Nonparametric communication indicators

do not depend on the distribution law

The use of nonparametric methods in comparison with parametric ones has

less restrictions on the source data

The association coefficient allows you to estimate

the strength of the connection between features

The conclusion about the deviation of the empirical distribution from the normal can be made on the basis of the assessment of the following values

asymmetry, kurtosis

The conclusion about the deviation of the empirical distribution from the normal can be made on the basis of the assessment of the following values

asymmetry, kurtosis

Spearman's correlation coefficient

To compare the average values of a trait in two empirical populations using the Student's t-test, you need to know

mean values, standard errors, number of observations of a trait in each of the populations

For the application of the Student's t-test to decide the significance of the difference between two empirical sets, the necessary conditions are

the quantitative nature of the trait, the normal distribution option

For the application of the χ2 criterion without Yeitz's correction for deciding the significance of the difference between two empirical sets, the necessary conditions are

the number of observations in the collection is not less than 50 and not less than 5 in a separate class of the variational series

Nonparametric difference criteria can be used when comparing populations

by quantitative and qualitative characteristics

Determine which age group the employee at the age of 45 belongs to, if the grouping has the following form: Group I: up to 25 years old; II group 25-34; III group 35 - 44; IV group 45-54; V group 55-64; VI group over 65 years old

to the fourth group

An example of what series is the distribution of 2nd year students by gender?

attributive series

The formula R = Xmax - Xmin describes

range of variation

The most common type of distribution in nature of mass processes and phenomena in biology are:

normal distribution

Correlation analysis is -

quantifying the tightness of the relationship between the signs

With a sample of n = 36, the standard deviation has a value of 24. What is the standard error?

For diagnostic tests, it is used...

sensitivity, specificity

In the analysis of variance, for the adoption of the null hypothesis, it is determined

ratio of intergroup variance to intragroup variance

linear regression

determining the minimum sample size

In 1899 he developed the foundations of the science called biometrics:

Galton

The set of separate objects that differ from each other and at the same time are similar in some respects are called:

aggregate

A synonym for the term "dispersion" is:

variation

Variants are numerical values:

random variable

Theoretically, an infinitely large or approaching infinity totality is called:

general

A set of objects is characterized by characteristics. This variation is called:

quality

A particular case of a qualitative variation is:

alternative

The numbering of the variant in the variation series is called:

ranking

The class with the greatest frequency was named:

modal

When studying the graphical distribution, the following is usually observed in normally distributed variational series:

the frequency of the variant gradually decreases towards the edges of the variation

The class "46-48" is modal. In this case, the mod equals:

The number of degrees of freedom in a sample of 41 options is equal to:

Weighted arithmetic mean is used in the following cases:

a complex set

Each separate phenomenon, taken by itself, seems to be accidental. But taken in bulk, they reveal:

statistical patterns

A mathematician worked under the pseudonym Student:

Gosset

The ratio of the size of the sample (n) to the total size of the general population (N) is called:

alternative sampling

Possible intervals within which the arithmetic mean of the general population can be located are called:

confidential

The "null hypothesis" is based on the following statement:

there are no statistically significant differences between the studied indicators

The Three Sigma Rule states:

these variations with a probability of 0.997 lie in the interval M ± 3σ

100

The more pups in the litter of multiple animals, the less each of them weighs. This is an example:

negative correlation

Histo100-200

Arda Emre HAN · 76問 · 2年前

Histo100-200