Convincing Features
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Question 1
Explain the difference between paired and unpaired samples in a hypothesis testing procedure involving two sample means. Give one (1) suitable example for each type of sample selection.
Question 2
List two (2) applications of standardized normal distribution.
Question 3
When a certain production machine is in perfect adjustment it produces bolts with a mean diameter of 0.6 cm and a standard deviation of 0.15cm. In order to ascertain whether or not the machine is still in adjustment, a sample of 49 bolts is selected. The sample means the diameter is found to be 0.57cm. Is the machine still in adjustment?
Question 4
A company is interested in knowing if there is a difference in the average salary received by the machine operator for two departments. According to the samples, 18 machine operators from Department A and 13 machine operators from Department B are selected randomly and the following information is obtained:
Question 5
A quality control inspector keeps a tally sheet of the number of acceptable and
unacceptable products that come off two different production lines. The completed sheet is shown below.
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