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Unformatted text preview: Check your understanding: 30 simple Fill-in-the-Blank Answers 1. The probability distribution of a statistic is sometimes referred to as its ____________________________ to emphasize that it describes how the statistic varies in value across all samples that might be selected. ANSWER : sampling distribution 2. Let X 1 , X 2 ,....., X 20 be a random sample from a distribution with mean of 32 and standard of 10. Then the expected value of the sample mean is __________. ANSWER : 32 3. Let X 1 , X 2 ,....., X 25 be a random sample from a population with mean of 60 and standard deviation of 16. Then the standard deviation of the sample mean X ! = __________. ANSWER: 3.2 4. The distribution of the sample mean X becomes more _______________ about the population mean as the size increases. ANSWER: concentrated 5. The formula used to construct a 95% confidence interval for the mean of a normal population when the value of the standard deviation ! is known is given by ___________________. ANSWER: n x / 96 . 1 ! 6. The standard normal random variable n x z / ! " = has a mean value of __________ and a standard deviation of __________. ANSWER: 0, 1 7. If a confidence level of 90% is used to construct a confidence interval for the mean of a normal population when the value of the standard deviation !...
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- Winter '08