QUESTION 21 When we sample from an infinite population, what happens to the standard error of the mean if the sample size is decreased from 2500 to 1600. O Increased by 1.25 times O Decreased by 2.4 times O Decreased by 1.2 times O Increased by 1.4 times

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QUESTION 21
When we sample from an infinite population, what happens to the standard error of the mean if the sample size is decreased from 2500 to 1600.
O Increased by 1.25 times
O Decreased by 2.4 times
O Decreased by 1.2 times
O Increased by 1.4 times
QUESTION 22
A research worker wants to determine the average time it takes a mechanic to rotate the tires of a car, and she wants to be able to assert with 9596 confidenceE
of her sample is off by at most 0.6 minutes. If she can presume from past experience that the actual time follows normal distribution with a standard deviation
how large the sample will she have to take?
O 28
O 20
Transcribed Image Text:LCOME TO OLD TRA board emaining Time: 1 hour, 40 minutes, 55 seconds. uestion Completion Status: T.981, T3.567) QUESTION 21 When we sample from an infinite population, what happens to the standard error of the mean if the sample size is decreased from 2500 to 1600. O Increased by 1.25 times O Decreased by 2.4 times O Decreased by 1.2 times O Increased by 1.4 times QUESTION 22 A research worker wants to determine the average time it takes a mechanic to rotate the tires of a car, and she wants to be able to assert with 9596 confidenceE of her sample is off by at most 0.6 minutes. If she can presume from past experience that the actual time follows normal distribution with a standard deviation how large the sample will she have to take? O 28 O 20
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