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# \$5.00Statistics 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

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Q:
 1. For non-normal populations, as the sample size (n) _________, the distribution of sample means approaches a/an __________ distribution. (Points : 1)

1.   decreases, uniform
2.   increases, normal
3.   decreases, normal
4.   increases, uniform
5.   increases, exponential

 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)

1.  True
2.  False

 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)

1. Population distribution is normal.
2. Population distribution is uniform

 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)

1.  True
2.  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)

1.  wider than
2.  narrower than
3.  equal to

 6. As the sample size ________the variation of the sampling distribution of ___________. (Points : 1)

1.  decreases, decreases
2.  increases, remains the same
3.  decreases, remains the same
4.  increases, decreases

 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)

1.  the z (normal) distribution.
2.  the t distribution.
3.  the Binomial distribution.
4.  the Poisson Distribution.
5.  None of the above.

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

1.  True
2.  False

 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)

1.  wider than
2.  narrower than
3.  equal to

 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)

1.  z distribution.
2.  t distribution.
3.  Exponential distribution.