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# Sampling and Inference Risk

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### Why is there always a risk of an inference about a population being incorrect when based on the knowledge of a limited sample?

Due to the limited number of cells examined and the possibility of all items in the sample being unsatisfactory.

### What is the rescue in situations where there is a risk of incorrect inference based on a limited sample?

Evaluating such risks using statistics.

### Why is it important to understand probability and probability distributions in statistics?

To equip ourselves with methods of drawing statistical inferences and estimating the reliability of these inferences.

### What does the scope of statistics include besides descriptive and inferential branches?

<p>Methods of dealing with issues of specific nature, which are essentially descriptive in nature.</p> Signup and view all the answers

### What is the primary purpose of inferential statistics?

<p>Drawing inferences about the entire population based on sample information</p> Signup and view all the answers

### Explain why it is important to use inferential statistics in situations like estimating the average body weight of all college students in a city.

<p>To evaluate risks involved in generalizing from incomplete sample data to the entire population</p> Signup and view all the answers

### Why would one need to repeat the exercise of estimating average body weight for college students in a future year?

<p>To compare and determine if there have been significant changes in body weight over time</p> Signup and view all the answers

### How can inferential statistics be used in deciding whether a given lot of battery cells is good enough to buy?

<p>By inspecting a sample from the lot to make generalizations about the entire lot</p> Signup and view all the answers

### What risks are involved in drawing inferences about an unknown population based on sample information?

<p>The risk of making incorrect generalizations or conclusions about the population</p> Signup and view all the answers

### Explain the need for hypothesis testing in inferential statistics.

<p>To assess the validity of assumptions made about the population based on sample data</p> Signup and view all the answers

### What are some possible causes of deficiency in achieving sales targets?

<p>i) targets were too high and unrealistic (ii) salesmen's performance has been poor (iii) emergence of increase in competition (iv) poor quality of company's product</p> Signup and view all the answers

### How can statistical methods be used in personnel management?

<p>Statistical methods can be used for fixation of wage rates, incentive norms, performance appraisal, and productivity measurement.</p> Signup and view all the answers

### What is the relevance of productivity in personnel management?

<p>Productivity is important for determining productivity bonuses for workers and comparing wages with productivity levels.</p> Signup and view all the answers

### How can statistical methods help in ascertaining the efficacy of a new medicine?

<p>Statistical methods can be used to conduct experiments involving groups of patients to compare the effectiveness of the new medicine with existing treatments.</p> Signup and view all the answers

### What is the purpose of maintaining records for two comparable groups in a medicine effectiveness study?

<p>The purpose is to compare the outcomes of patients treated with the new medicine against those treated with existing medicines to assess effectiveness.</p> Signup and view all the answers

### In the context of personnel management, why are comparisons of wages and productivity important?

<p>Comparisons are important to ensure increases in industrial productivity by assessing the correlation between wages and productivity levels.</p> Signup and view all the answers

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