ISS Statistics Paper II (Old Subjective Pattern): Questions 1 - 8 of 39

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Question number: 1

» Statistical Quality Control » Sequential Sampling Plans

Appeared in Year: 2015

Essay Question▾

Describe in Detail

Distinguish between the single sampling plan and double sampling plan. Discuss how the O. C curves can be used for comparing two sampling plans.

Explanation

A single sampling plan in which a decision about the acceptance or rejection of a lot is based on one sample that has been inspected where double sampling plan when a decision about the acceptance or rejection of a lot has not been reached after single sample inspection from a… (282 more words) …

Question number: 2

» Hypotheses Testing » Likelihood Ratio Test » ASN Function

Appeared in Year: 2015

Essay Question▾

Describe in Detail

Derive the likelihood ratio test for comparing the means of k independent homoscedastic normal populations.

Explanation

Given that there are k independent homoscedastic normal populations that is the variance is same i. e. Equation; i = 1, 2, …, k. We have to test

Equation

In the X population the sample is = { (x i1, x i2, …, x ini)

The… (75 more words) …

Question number: 3

» Estimation » Optimal Properties » Complete Statistics

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Define completeness. Verify whether Bin (1, p) is complete.

Explanation

Completeness: It is a property of a statistic in relation to a model for a set of observed data. In essence, it is a condition which ensures that the parameters of the probability distribution representing the model can all be estimated on the basis of the statistic: it ensures… (319 more words) …

Question number: 4

» Estimation » Estimation Methods » Methods of Moments

Appeared in Year: 2014

Essay Question▾

Describe in Detail

For the Pareto distribution with pdf

Equation

Show that method of moments fails if 0 < λ < 1. State the method of moments estimator when λ > 1. Is it consistent? Justify your answer.

Explanation

Let X 1 , X 2 , …, X n be a simple random sample of Pareto random variables with density

Equation

The mean and variance are respectively

Equation

In this we have only one parameter λ. Thus, we will only need to determine the first moment

Equation

To find… (109 more words) …

Question number: 5

» Estimation » Estimation Methods » Methods of Moments

Appeared in Year: 2014

Essay Question▾

Describe in Detail

X 1, X 2, …, X n be a random sample from U (0, θ). Obtain the moment estimator of θ. Also find its variance.

Explanation

Let X 1, X 2, …, X n be a random sample from U (0, θ). We known that

Equation

The estimating equation is

Equation

The above equation is solving for the parameter, we get the estimator by using method of moments

Equation

The variance of this estimator… (19 more words) …

Question number: 6

» Linear Models » Theory of Linear Estimation » Gauss-Markoff Setup

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Define estimability of a linear parametric function in a Gauss Markov model. State and prove a necessary and sufficient condition for estimability.

Explanation

Estimability : The linear parametric function c’β is an estimable function if there exists a vector

a R n such that

Equation

If X is of full column rank then all linear combinations of β are estimable, since Equation is unique, that is

Equation

Suppose we are dealing with the… (136 more words) …

Question number: 7

» Estimation » Estimation Methods » Maximum Likelihood

Appeared in Year: 2014

Essay Question▾

Describe in Detail

X 1 , X 2 , …, X n are i. i. d. random variables from N (θ, 1) where θ is an integer. Obtain MLE of θ.

Explanation

X 1 , X 2 , …, X n are i. i. d. random variables from N (θ, 1). The density function of X is

Equation

The likelihood function is

Equation

Equation

The log likelihood function is

Equation

Differentiate this with respect to θ and equating to zero,

Equation

Equation<span class="more">… (17 more words) …</span>

Question number: 8

» Hypotheses Testing » Hypothesis » Composite

Appeared in Year: 2014

Essay Question▾

Describe in Detail

A sample of size n from normal distribution N (θ, σ 2 ) with σ 2 =4 was observed. 95 % confidence interval for θ was computed from the above sample. Find the value of n if the confidence interval is (9.02, 10.98).

Explanation

The Margin of error is defined as

Equation

Where z α/2 is the critical value = 1.96

σ is the standard deviation = 2

E is the margin of error= Equation

Equation

Equation

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