1.
Which of the following statements is true about a parameter and a statistic for samples taken from the same population?
A) The value of the parameter varies from sample to sample.
B) The value of the statistic varies from sample to sample.
C) Both A and B are true.
D) Neither A nor B are true.
2.
Which one of the following statements is
false
?
A) The standard error measures the variability of a population parameter.
B) The standard error of a sample statistic measures, roughly, the average difference between the values of the statistic and the population parameter.
C) Assuming a fixed value of s = sample standard deviation, the standard error of the mean decreases as the sample size increases.
D) The standard error of a sample proportion decreases as the sample size increases.
3.
Sleep apnea is a condition involving irregular breathing during sleep. Suppose that about 20% of a random sample of n = 64 men experience sleep apnea. What is the standard error of
the sample proportion?
A) 0.125
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 Fall '08
 BARROSO,JOAOR
 Statistics, Standard Deviation, Standard Error

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