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# \$5.00Statistics for Managers, Week 3 quiz help

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• Due on Dec. 15, 2011
• Asked on Dec. 12, 2011 at 12:25:18AM

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 1. Assuming the same value of a, as the sample size increases, the value of ta/2 approaches the value of Za/2. (Points : 1)        True        False

 2. If the population proportion is .4 with a sample size of 20, then is this sample large enough so that the sampling distribution of is a normal distribution. (Points : 1)        True        False

 3. A sample statistic is an unbiased point estimate of a population parameter if the mean of the population of all possible values of the statistic equals the population parameter. (Points : 1)        True        False

 4. The sampling distribution of x bar must be a normal distribution with a mean 0 and standard deviation 1. (Points : 1)        True        False

 5. When the level of confidence and sample standard deviation remain the same, a confidence interval for a population mean based on a sample of n = 100 will be _____ a confidence interval for a population mean based on a sample of n = 50. (Points : 1)        wider than       narrower than       equal to

 6. There is little difference between the values of ta/2 and Za/2 when the sample (Points : 1)        size is small.       size is large.       mean is small.       mean is large.       standard deviation is small.

 7. A 82% confidence interval for a sampling distribution with a mean of 100, a sample standard deviation of 24 and a sample size of 36 will be based on a á= ______ and a corresponding Zá of ____ (Points : 1)        .18 and .47       .18 and .915.       .09 and .23       .09 and 1.34

 8. The central limit theorem states that as sample size increases, the population distribution more closely approximates a normal distribution. (Points : 1)        True        False

 9. When the level of confidence and sample proportion remain the same, a confidence interval for a population proportion p based on a sample of n = 100 will be _____ a confidence interval for p based on a sample of n = 400. (Points : 1)        wider than       narrower than       equal to

 10. When the sample size and the sample proportion remain the same, a 90% confidence interval for a population proportion p will be ______ the 99% confidence interval for p. (Points : 1)        wider than       narrower than       equal to

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