問題一覧
1
For what types of features is the Spearman coefficient usually used?
quality
2
What does the abscissa and ordinate mean when the frequencies polygon is drawn?
on the abscissa - the values of the sample variant, on the ordinate - the corresponding frequencies
3
For what p, for a small sample, is the null hypothesis true?
p > 0.05
4
There is no statistical sample type?
Five times blind sampling
5
One-factor, two-factor, three-factor are:
analysis of variance
6
All of the listed types of communication refer to correlation communication, except
body temperature and age
7
The variation series in the medical literature is called....
statistical distribution, consisting of a variant and their corresponding frequencies
8
The law of distribution is...
the regularity of the change in frequencies in the variation series
9
Student's coefficient depends on....
sample size
10
What function can be used to calculate the root mean square value in MS EXCEL-2013?
f(x) = SUMSQ ( )
11
To calculate the linear regression coefficient, it must be known:
the standard deviations of both variation series for the signs x and y, and the correlation coefficients between them
12
With an alternative variation (for example, got sick - did not get sick, happened - did not happen), the date of the disease or fact is an event:
random
13
The observation unit is:
element of the statistical population
14
When studying the results of three-factors analysis of dispersion, how manydegree of independence are indicated in the Fisher criterion?
2 levels
15
Which function can be used to calculate the arithmetic mean in MS EXCEL- 2013?
f(x) = AVERAGE ( )
16
As the difference between the actual and expected numbers increases, the value of χ2:
increases
17
What are the consequences of identifying a large number of groups in the variation series?
improving the accuracy of the characteristics of the row
18
To calculate which indicator is used the formula
Mode indicator
19
A simple statistical series is this.......
sample size values recorded in the measurement sequence
20
A series of any measurements is called:
Variation series
21
The indicator of the reliability of the difference in average values is:
confidence factor
22
In statistics and informatics, for a more accurate characterization of phenomena in medicine and health care, it is necessary to be able to determine the amount of information. What approach to the definition of the concept of "information" is used for this?
probabilistic, information is a measure of reducing uncertainty
23
When there is a need to calculate the exact level of bond strength, the coefficient is used:
correlations
24
Mode is called:
the most common value of a feature in a given series
25
From a mathematical point of view, the statistical parameter is optimally rounded (n = 1570):
P = 8,28%
26
The during measurements in homogeneous groups of subjects obtained the following values for heart rate: 71, 73, 74. Give an interval estimate of the mean with a confidence level of 0.98 (tst = 7).
72,7 - 6,2 <xo< 72,7 + 6,2
27
The standard deviation is:
a measure of variability, variability of a trait
28
When studying the results of one-factors analysis of dispersion, how manydegree of independence are indicated in the Fisher criterion?
2 Levels
29
In which cases does factor A not affect the value of X?
S2between<S2within
30
The normal distribution is completely determined by two characteristics:
mean and standard deviation
31
To establish whether these factors affect the variability of the trait or not and which of them have a greater specific weight in the total variability allows:
methods of analysis of variance
32
Selective observation is:
observation, covering part of the units of the population to characterize the whole
33
If the statistical series obeys the law of normal distribution, what is the difference between median, mode and arithmetic mean?
Mode, median and arithmetic mean are overlap
34
... this is the process of forming homogeneous groups on the basis of dividing the statistical population into parts or combining the studied units into private aggregates according to the characteristics that are essential for them:
statistical grouping
35
What does the abscissa and ordinate mean when a histogram of frequencies is drawn?
abscissa - intervals, ordinate - frequencies
36
The during measurements in homogeneous groups of subjects obtained the following values for the respiration rate: 12, 14, 13. Give an interval estimate of the mean value with a confidence level of 0.95 (tst = 4.3).
13,0 - 2,5 <xo< 13,0 + 2,5
37
Select the criteria that relate to the assessment of the reliability of the research results:
Student's t test and χ2 test
38
What are the elements of the distribution variation series?
variables, frequencies
39
What function can be used to calculate the geometric mean in MS EXCEL-2013?
f(x) = GEOMEAN ( )
40
If you know the values of the attribute for each unit of the population and the number of units with this or that attribute value, then the formula is applied
weighted arithmetic mean
41
Through daily sampling from the field, the change in the height of soybean plants y with their age x was studied. To establish the degree of variation of two variables, as well as to determine how one feature changes quantitatively as the other changes, calculate:
regression coefficient
42
The main requirement for the sample:
representativeness
43
Option is:
numeric expression of the attribute
44
The characteristic of the diversity of the studied trait in the variation series is:
standard deviation
45
The boundary of the general population at a given degree of probability characterizes
confidence interval
46
Distribution of the total sum of squares into groups, including: the effect of factors A, B, C; the interaction of factors A and B, A and C, B and C, and A, B, C together, as well as for random deviations, is applied when:
three-way analysis of variance
47
The reliability of the arithmetic mean depends on the following elements [all but one is true]:
conditional mean
48
The following average value does not depend on the values of the extreme variant:
median
49
In biostatistics, the analysis result should be:
confidence
50
What statements correspond to the χ2 test:
based on the calculation of the difference between actual and "expected" data
51
Were calculated in the course of observations (n = 16), the arithmetic mean (M = 59.8) and standard deviation (σ = 2.0). Find the required minimum number of observations to reduce the standard error (m) by 50%. (t = 2)
64
52
The calculation of the required size of the sample with an alternative variation is carried out according to the formula:
n = t2 p(1-p)/∆2
53
Were calculated in the course of observations (n = 16), the arithmetic mean (M = 59.8) and standard deviation (σ = 2.0). Find the required minimum number of observations to reduce the standard error (m) by 25%. (t = 2)
28
54
Were calculated in the course of observations (n = 16), the arithmetic mean (M = 59.8) and standard deviation (σ = 2.0). Find the required minimum number of observations to reduce the standard error (m) by 15%. (t = 2)
22
55
The variance of an alternative feature is determined by the formula:
σ2 = pq
56
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
57
The share in the general population is determined by the formula:
p=n/N
58
Nonparametric test for comparing dependent samples...
T-Wilcoxoncriterion
59
Indicate the relative values:
the number of men per 1000 women is 895
60
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
61
In the which distribution the arithmetic mean, mode and median will be equal
With normal distribution
62
What does the term "accept a hypothesis" mean?
The results of scientific observations do not contradict the original assumptions
63
What kind of graphs of distribution series are used to represent interval variation series?
Histogram
64
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
65
Which of the given formulas determines the value of the total variance?
Dtotal = Dbetween + Dwithin
66
For a random error m = 0.966 with a probability of P = 0.95, determine the boundaries of the confidence interval
∆ ≈ ± 2
67
What is the main task of the analysis of variance?
Identification of the influence of factors that determine the variability of the trait
68
When deciding on the organization of the sample, what statistical characteristic is considered a criterion?
Sampling error
69
What are the boundaries in which the general characteristic can be located with a given probability?
Confidence interval
70
s
a
71
is
b
72
b
73
s
c
74
What is the name of the ability of the sample to assess the general population?
Representativeness
75
What is the correlation coefficient if the relationship is not close?
r → 0
76
Give a definition of the linear correlation coefficient indicator...
meter of the tightness of communication with a straight line dependence
77
What is the name of the average value that falls in the middle of the variation series?
Median
78
s
e
79
A number of nonparametric criteria are also called...
ranked
80
With the help of what kind of graphs of the distribution series depict discrete variation series?
Polygon
81
What are the main elements of statistical distribution series.
options, frequency
82
What is the statistical characteristic of the center of frequency distribution in the distribution row?
Arithmetic mean
83
If the variance of the sample is reduced by 4 times, then the standard error of the sample...
will decrease by 2 times
84
The rule for adding variances is that….
the total variance is equal to the sum of the between-group and within-group variances
85
The change in the values of the attribute in the units of the population in space or in time is called….
variation
86
What symbol usually denotes the standard deviation?
σ
87
The standard deviation is calculated as….
square root of variance
88
The degree of closeness of the relationship between indicators can be measured by:
correlation coefficient
89
The following methods of analysis are used to study statistical relationships:
correlation
90
The statistical feature is….
distinguishing feature between units of the population
91
The essence of the statistical grouping is….
dismemberment of the general population of units according to certain criteria
92
Depending on the type of initial data, the average value can be of the following types:….
Arithmetic, Harmonic, Cubic, Geometric
93
For the calculation of the average, the weighted average formula is applied if the statistics….
grouped
94
The average is
characteristic feature
95
Variantis…
unit of the variation series
96
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
97
In what limits can the value of the correlation coefficient fluctuate?
from -1 to +1
98
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
99
The median of the series (Me) is
center variant, halving the row
100
Mode is
variant, which occurs more often than others