ISS Statistics Paper III: Questions 37  40 of 90
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Question number: 37
» Sampling Techniques » Stratified Random Sampling
Appeared in Year: 2011
Describe in Detail
Let for a stratified random sampling where is constant, is thecost per unitin i^{th }stratum, is the mean square based on units.
Estimate the sample sizen under optimum allocation for fixed cost .
Explanation
Under optimum allocation, are obtained such that
(i) minimize the variance of the estimate for (a) fixed sample size n;
(i) var ( is minimum for fixed n
(ii) var ( is minimum for fixed total… (484 more words) …
Question number: 38
» Econometrics » Ordinary Least Squares (OLS)
Appeared in Year: 2011
Describe in Detail
If is an individual’s utility function of two goods, show that the demand for the goods is and
Where and are the fixed price and µ be the individual fixed income.
Explanation
For consumer’s equilibrium, we have
and hence, we get
→ … (182 more words) …
Question number: 39
» Econometrics » AutoCorrelation
Appeared in Year: 2011
Describe in Detail
Discuss the effect of imperfect multicollinearity on tests and errors. Consider a model
with
and with
, ,
and
Do you think multicollinearity is present in the model? If yes, give reasons. Further show that as
increases, also increases.
Explanation
Effect of imperfect multicollinearity on tests and errors:

OLS estimators will be BLUE, but they have large variances and covariances. this makes the estimation difficult.

The confidence intervals will be wider. and hence, we may not reject the ’zero null hypothesis i. e. , We may conclude that B’s are… (522 more words) …
Question number: 40
» Applied Statistics » Time Series Analysis » Exponential and Moving Average Smoothing
Appeared in Year: 2011
Describe in Detail
Explain moving average [m, p]. Let with p = 1 and m = 2k + 1, obtain the coefficient of and [m, p]
Explanation
Moving average: moving average method is a simple and flexible method for measuring trend. It consists in measurement of trend by smoothing out the fluctuations of the data by means of a moving average.
The first element of the moving average is obtained by taking the average of the initial… (437 more words) …