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Statistics questions
- From Mathematics: Statistics
- Closed, but you can still post tutorials
- Due on Jul. 22, 2012
- Asked on Jul 22, 2012 at 1:58:47PM
Q:
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1. For non-normal populations, as the sample size (n) _________, the distribution of sample means approaches a/an __________ distribution. (Points : 1)
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1. decreases, uniform
2. increases, normal
3. decreases, normal
4. increases, uniform
5. increases, exponential
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2. 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)
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1. True
2. False
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3. If in a sampling distribution of the sample size is 25, what assumption must hold for the sampling distribution of to be normal? (Points : 1)
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1. Population distribution is normal.
2. Population distribution is uniform
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4. Assuming the same value of a, as the sample size increases, the value of ta/2 approaches the value of Za/2. (Points : 1)
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1. True
2. False
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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)
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1. wider than
2. narrower than
3. equal to
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6. As the sample size ________the variation of the sampling distribution of ___________. (Points : 1)
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1. decreases, decreases
2. increases, remains the same
3. decreases, remains the same
4. increases, decreases
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7. When the population is normally distributed, population standard deviation ó is unknown and the sample size is n = 15, the confidence interval for the population mean µ is based on (Points : 1)
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1. the z (normal) distribution.
2. the t distribution.
3. the Binomial distribution.
4. the Poisson Distribution.
5. None of the above.
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8. The sampling distribution of x bar must be a normal distribution with a mean 0 and standard deviation 1. (Points : 1)
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1. True
2. False
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9. When the sample size and sample standard deviation remain the same, a 99% confidence interval for a population mean, µ will be _____ the 95% confidence interval for µ. (Points : 1)
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1. wider than
2. narrower than
3. equal to
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10. When a confidence interval for a population proportion is constructed for a sample size n = 100 and the value of, p = .4 the interval is based on the (Points : 1)
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1. z distribution.
2. t distribution.
3. Exponential distribution.
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