what is Statistics, who is the father of modern statistics, what is the origin of the word Statistics
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- what is Statistics?
Ans: Statistics is the science of decision making in the field of uncertainty.
- who is the father of modern statistics?
Ans: R.A. Fisher.
- what is the origin of the word Statistics?
Ans: the origin of the word Statistics in status or statistic.
- what is Business Statistics?/ What is mean by Business Statistics?
Ans: Business Statistics is a science Assisting us to make business decision under uncertainties based on some numerical and measurable scale.
- What is variable?
Ans: the characteristic which varies over the units is called variable.
- what is data?
Ans: Data are the collection of row facts and figures from any sets of inquiry for the purpose from any sets of inquiry for the purpose of statistical analysis.
- What is statistical data?
Ans: A collection of any number of related observation on one or more variables is called statistical data.
- what are sources of data?
Ans: Data can be collected from three sources:
1. Primary Source.
2. Secondary Source
3. Internal Source.
- Write the definition of continuous variable with examples.
Ans: A continuous variable is one that can take on any value within given range.
- what is ogive curve?
Ans: Ogive is a graph of cumulative frequency distribution.
- what is Stem and leaf diagram?
Ans: Stem and leaf Display is a statistical technique to present a set of data.
- What is frequency polygon?
Ans: A frequency polygon expresses distribution of data by meab of a single line determined by the midpoints of classes.
- what is pie chart?
Ans: A pie chart presents the data in the form of a circle.
- what is data?Ans: A collection of any number of related observations of none or more variables are called data.
- what is raw data?Ans: Information before it is arranged or analyzed by statistical methods are raw data.
- What is classification?Ans: classification is the process of arranging data as collected by proper investigation in some groups or class in relation with definite. characteristics grouping of related facts into classes.
- what is bar diagram?Ans: Bar diagrams are the most common type of diagrams used in practice. A bar is a thick line whose width is shown merely for attention.
- what is Scatter diagram?
Ans: A graph of points on a rectangular grid the X and Y coordinates of each point corresponded to the two measurements made on some particular sample element and the pattern of points illustrates the relationship between the two variables.
- What is Sample?Ans: A collection of some but not all of the elements of the population under study used to describe the population.
- What is data array?Ans: An organized display of data that shows the number of observations from the data set that falls into each of a set of mutually exclusive and collectively exhaustive classes is frequency distribution.
- What is frequency density?Ans: frequency density is the percentage of observation fall within each class in respect of their class width.
- what is population?Ans: A collection of all the elements we are studying and about which we are trying to draw exclusions.
- what is central tendency?Ans: Central tendency is a typical value of a data set around which other figures congregate.
24.Define Quadrilles.Ans: the quadrilles that divide the data into 4 equal parts.
- what is the relationship among AM, GM & HM?Ans: AM≥GM≥HM
- What is Harmonic Mean.Ans: Harmonic mean is the ratio between the number of items and the sum of reciprocals of items.
- What is Average ?Ans: Average is an attempt to find one single figure to describe whole of figures.
- What is frequency Distribution?Ans: An organized display of data that shows the number of observations from the data set that falls info each of a set of mutually exclusive and collectively exhaustive classes.
- What is Equal class interval?Ans: the distribution which with of the each class is equal is called equal class interval. for example 10-20 , 20-30, 30-40 and 50-60.
- What is Stem and leaf display?Ans: one technique that is used to display quantitative information in a condensed form is the stem and leaf display.
- What is Dispersion?Ans: the distance of different values from the central value is called dispersion.
- What do you mean measures of dispersion.Ans: the measures of dispersion are called averages of second order.
- How many types of measure of dispersion?Ans: Two types of measure of dispersion (1) Absolute measure (2) relative measure.
- The difference between the first and third quartertile is called the?Ans: Inter Quartile range.
- What is the range of 0, 2?Ans: Range = highest value- Lowest Value=0-2=-2
- What is the mode of 4, 6, 8, 10, 6, and 12?Ans: 6
- What is absolute measure?Ans: When dispersion is measured in original units then it is known as absolute measure of dispersion.
- what is mean deviation?Ans: Mean deviation is the arithmetic mean of the deviation of series computed from any measures of central tendency.
- find the mean if co-efficient of variance =15% and variance=4?Ans: we know cv= Error! Filename not specified.
- mention the relationship among mean median and mode in case of positively skewed distribution.Ans: In case of positive skewed distribution the relationship among mean median and mode are XError! Filename not specified.
- what is Box plot?Ans: Box plot is the graphical presentation of five number summaries.
- What is Random variable?Ans: Random variable is a variable whose values are determined by chance.
- What is skewness ?Ans: SKewness is the degree of a symmetry or departure from symmetry of a distribution.
- What is null hypothesis?Ans: The hypothesis about a population parameter we wish to test is called a null hypothesis.
- What do you mean by Ans:Error! Filename not specified.
- Define co-efficient of correlation.Ans: Co-efficient of correlation is the measure of the strength of the linear relationship between two variables.
- What is mean by r=+1, r=-1 and r= 0?Ans: the value of r=+1, Means the prefect positive correlation. the value of r=-1, means called perfect negative correlation.the value of r = 0 means called zero correlation.
- in case of unequal rank write the formula of rank correlation.Ans: Rank correlation 1-Error! Filename not specified.
- what is regression line?Ans: A line fitted to set data points to estimate the relationship between two variables.
- what is regression Analysis?Ans: Regression Analysis is a mathematical measure of the average relationship between two or more variables in terms of original units of the data.
- what is dependent variables?Ans: The variables we are trying to predict in regression analysis is called dependent variable.
- what is index number?Ans: index number may be defined as the ratio that measures how much a variable over time
- How many types of index number?Ans: Index number are 3 kinds. (1) price index (2) quantity index (3) Variable index.
- What is family budget method.Ans: Which the consumer price index is computed on the family budgets of large number of people, is called family budget method.
- under what condition time reversal test and factor reversal test is satisfied?Ans: Time Reversal Test is satisfied when opn×npo=1
- Write down the components of time series.Ans: The components of time series are (1) Trend (2) Seasonal variation (3) cyclical variation (4) Irregular varia
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