HSC Commerce कक्षा १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions

Choose the correct alternative:

Type I error is

Choose the correct alternative:

Type II error is

Choose the correct alternative:

The standard error of sample mean is

Explain the procedures of testing of hypothesis

Explain in detail the test of significance of a single mean

The mean I.Q of a sample of 1600 children was 99. Is it likely that this was a random sample from a population with a mean I.Q 100 and standard deviation of 15? (Test at 5% level of significance)

Define Statistical Quality Control

Mention the types of causes for variation in a production process

Define chance cause

Define assignable cause

What do you mean by product control?

What do you mean by process control?

Define a control chart

Name the control charts for variables

Define the mean chart

Define R chart

What are the uses of statistical quality control?

Write the control limits for the mean chart

Write the control limits for the R chart

A machine is set to deliver packets of a given weight. Ten samples of size five each were recorded. Below are given relevant data:

Calculate the control limits for mean chart and the range chart and then comment on the state of control, (conversion factors for n = 5, A₂ = 0.58, D₃ = 0 and D₄ = 2.115)