Which of the following components of time series reflect the general tendency of the data to increase or decrease during a long period of time?
Trend
The "trend" component of a time series refers to the long-term direction in the data (whether it is increasing, decreasing, or stable) over an extended period of time. It shows the general tendency of the data to either rise or fall. Hence, the correct answer is "Trend".
Calculate the median using the following data.
Lower class boundary of the median class = 40
Total frequency = 120
Frequency of the median class = 35
Less than cumulative frequency of the post median class = 37
Class width = 20
The ______ is an unbiased estimator of the population mean.
If xi = i / 5 + 2, where i = 1, 2,..., 5, then the mean of x1, x2, ..., x5 is:
How many employees get salaries less than Rs 30,000?
The following data shows salaries of all the employees of a company:
| Salary (in Rs.) / वेतन (रुपये में) | 0 - 10,000 | 10,001 - 20,000 | 20,001 - 30,000 | 30,001 - 40,000 | 40,001 - 50,000 |
|---|---|---|---|---|---|
| Number of Employees / कर्मचारियों की संख्या | 235 | 105 | 50 | 40 | 20 |
Calculate the standard deviation if the mean of a certain set of observations is 20 and the mean of the squares of the same observations is 500.
Calculate the coefficient of range for the following set of data: 3, 6, 6, 8, 9 and 12.
If the mean of a certain set of data is 16 and variance is 4, then find the coefficient of variance.
If a set of points represent probability density, then the third central moment is the ___________.
What is the mean of a data if its Pearson's coefficient of skewness is 0.25, standard deviation is 6 and mode is 18?
Coefficient of Kurtosis β2 = ____________, where μ2 and μ4 are the second and fourth moments about mean.
Calculate the median using the following data.
Lower class boundary of the median class = 40
Total frequency = 120
Frequency of the median class = 35
Less than cumulative frequency of the post median class = 37
Class width = 20
The ______ is an unbiased estimator of the population mean.
If xi = i / 5 + 2, where i = 1, 2,..., 5, then the mean of x1, x2, ..., x5 is:
How many employees get salaries less than Rs 30,000?
The following data shows salaries of all the employees of a company:
| Salary (in Rs.) / वेतन (रुपये में) | 0 - 10,000 | 10,001 - 20,000 | 20,001 - 30,000 | 30,001 - 40,000 | 40,001 - 50,000 |
|---|---|---|---|---|---|
| Number of Employees / कर्मचारियों की संख्या | 235 | 105 | 50 | 40 | 20 |