A machine produced 20 defective articles in a batch of 400. After overhauling, it produced 10% defectives in a batch of 300. Which test of hypothesis can be applied to the above situation to examine whether the machine has improved?
A. Test of significance of a sample proportion (two tail test)
B. Test of significance of a sample proportion (one tail test)
C. Test of significance of difference between two sample proportion (two tail test)
D. Test of significance of difference between two sample proportion (one tail test)
Answer: Option D
This Question Belongs to Commerce >> Business Statistics And Research Methods
A. The central limit theorem
B. The law of statistical regularly
C. The law of inertia of large numbers
D. None of the above
The difference between sample statistic and its corresponding population parameter is
A. Sampling error
B. Measurement error
C. Coverage error
D. Non-response error
A. Both (A) and (R) are true
B. (A) is true, but (R) is false
C. (A) is false, but (R) is true
D. Both (A) and (R) are false
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