Question

IU 3721 Assignment 1-Protected View- Saved to this PC View Help ρ Tell me what you want to do Review (s2/n) In an industry manufacturing process, 10% of samples were usually found to be defective. From a randomly 40 selected samples from a lot, 9 samples were found to be defective. Does this lot have higher defect rate than usual? Use 5% as your level of significance. 8"

Answer 1

its is an one sample propportion hypothesis testing

The hypothesised proportion is =0.10

the null hypothesis

$H_{0}:p\leq 0.10$

the alternative hypothesis

$H_{1}:p> 0.10$

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I have performed the test in minitab

Steps

1. Stat-Basic Statistics-one proportions
2. 
3. options
4.   
5. ok-ok

output

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As the p value is less than the signififance level=0.05 we reject the null hypothesis and conclude that this lot has higher defect than usual.

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