| 241 |
For a Poisson variable X, P(X = 1) = P(X = 2). The standard deviation of X is: |
Mathematics/Applied Mathematics
Poisson distribution |
Hard |
| 242 |
If X is normal with mean 50 and standard deviation 5, the standard normal value corresponding to X = 60 is: |
Mathematics/Applied Mathematics
Normal distribution |
Easy |
| 243 |
The mean and standard deviation of the standard normal variate Z are: |
Mathematics/Applied Mathematics
Normal distribution |
Easy |
| 244 |
For a normal distribution, approximately what percentage of values lie within two standard deviations of the … |
Mathematics/Applied Mathematics
Normal distribution |
Medium |
| 245 |
Given P(0 < Z < 1) = 0.3413 for the standard normal variate Z, the value of P(Z > 1) is: |
Mathematics/Applied Mathematics
Normal distribution |
Medium |
| 246 |
Marks of 1000 students are normally distributed with mean 60 and standard deviation 10. Given P(0 < Z < 2) = … |
Mathematics/Applied Mathematics
Normal distribution |
Hard |
| 247 |
Data on a company's annual profit, recorded year by year from 2001 to 2020, is an example of: |
Mathematics/Applied Mathematics
Time series and its components |
Easy |
| 248 |
Sales of umbrellas in a town rise sharply every monsoon and fall afterwards. This movement is: |
Mathematics/Applied Mathematics
Time series and its components |
Easy |
| 249 |
An economy passes through prosperity, recession, depression and recovery over a period of several years. This… |
Mathematics/Applied Mathematics
Time series and its components |
Medium |
| 250 |
A factory's output drops sharply for two months because of an unexpected flood. This change is best classifie… |
Mathematics/Applied Mathematics
Time series and its components |
Medium |
| 251 |
Under the multiplicative model of a time series, T = 500 units, S = 1.2, C = 0.9 and I = 1. The observed valu… |
Mathematics/Applied Mathematics
Time series and its components |
Hard |
| 252 |
The annual rainfall of one city recorded for 30 consecutive years is an example of: |
Mathematics/Applied Mathematics
Time series analysis |
Easy |
| 253 |
In a time-series graph (historigram), time is usually plotted on: |
Mathematics/Applied Mathematics
Time series analysis |
Easy |
| 254 |
In an additive time-series model, the observed value is 250 and the trend value is 230. The combined value of… |
Mathematics/Applied Mathematics
Time series analysis |
Medium |
| 255 |
Under the multiplicative model, a month's sales are 660 units and its seasonal index is 120. The deseasonalis… |
Mathematics/Applied Mathematics
Time series analysis |
Medium |
| 256 |
In a multiplicative model, the seasonal indices for the first three quarters of a year are 110, 95 and 85. Th… |
Mathematics/Applied Mathematics
Time series analysis |
Hard |
| 257 |
Which method of measuring secular trend is the most subjective, giving different results with different peopl… |
Mathematics/Applied Mathematics
Secular trend and its measurement |
Easy |
| 258 |
For the series 10, 14, 18, 16, 20, the 3-year moving averages are: |
Mathematics/Applied Mathematics
Secular trend and its measurement |
Medium |
| 259 |
Six years' sales are 20, 22, 24, 30, 32, 34. By the method of semi-averages, the two averages plotted are: |
Mathematics/Applied Mathematics
Secular trend and its measurement |
Medium |
| 260 |
A moving average with an even period, such as a 4-year moving average, must be: |
Mathematics/Applied Mathematics
Secular trend and its measurement |
Easy |