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$5.00 Statistics for Managers, Week 3 quiz help

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  • Due on Dec. 15, 2011
  • Asked on Dec. 12, 2011 at 12:25:18AM
Asked by :
emitcham45
emitcham45 Not confirmed
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Q:
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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  • Posted on Dec. 12, 2011 at 12:40:19AM
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A:
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  • Posted on Dec. 12, 2011 at 01:14:29AM
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A:
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