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The average household size in a certain region several years ago was 4.3 people. A census...

The average household size in a certain region several years ago was 4.3 people. A census worker wishes to test, at the 5% level of significance, whether it is different now. A random sample of 20 households will be used for the test. Which one of the following describes the correct rejection region to use for this test?

t > 1.729 or t < -1.729

t > 2.093

t > 2.093 or t < -2.093

t > 1.729

math   Statistics-And-Probability   
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Answer #1

df = 20 - 1 = 19

critical value = + t19,0.025 = + 2.093

Rejection region = t < -2.093 or t > 2.093

Option-C) t > 2.093 or t < -2.093

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