Statistics-101 Flashcards
What is the central tendency?
Central tendency is the measure to show where the data points are centered
What are the three measures of central tendency?
Mean, Median & Mode
What is the measure of Dispersion?
It shows the variability of data scattered
Should the central and measure of Dispersion both be required for better interpretation?
Yes
How the mean of data is represented?
x bar
How the mean and median is obtained?
The mean = sum of values/ Total no of values
Medain = First arrange the data is ascending or descending order , & if the no of values are odd then the observation at (n/2 +1 ) is the medain , *& if the no of values are even then the mean of (n/2)th and (n/2 + 1 )th is the median
Write a Programme to find the mean?
public static int findMean(int arr[]) {
if(arr.length == 0)
return 0;
int mean= 0;
for (int i = 0; i < arr.length; i++) {
mean= mean + arr[i];
}
return mean/arr.length;
}
What is meant by Statistics?
procure meaningful data to enrich the context
What are the 4 basic stages of Stats?
Collect > Organise > Analyse > Interpret > Present
What is Primary & Secondary Data?
Primary Data is data gathered by someone with some objective in mind
Secondary Data is data gathered from a readymade source
What care is important with Secondary Data?
It must come from a reliable source
What is a Range?
The difference of Highest-Lowest datum
What is a Range?
The difference of Highest-Lowest datum
What is a Frequency distribution?
No of Repetitions of data or event
What is Class Interval?
Grouping of data in sub ranges
What is a Class Width or Class SIze?
The subrange size we choose for class interval
What basic info we can get form Grouped Frequency Distribution?
We can get a good apportioned advice, that where the data is inclined
In case of grouped frequency distribution , in case we have weight 30.5 , so where it will belong
get the gap between tow intervals and divide by 2, add the result in intervals lower limit and upper limit
What is a Grouped Frequency Distribution?
It shows the majority of data inclined , A good use case is the policy is applied to 10 states and then after implementation the many states
showed the ploicy result , so we may need not to do it singly , we can subgropu the whole state in range intervals and see the result percentage
What are the types of data
Categorical and Numerical
What are categorical types
Like groups and then yes or no options
What are the types of numerical data
Continuous and discreet
What are types of measurement
Qualitative and Quantitative
What are the types of qualitative
Ordinal it could be qualitative Quantitative
Nominal it is value but not having any order like seasons
