Week 5 Assignment Quiz
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w5_quiz.docxW5 Quiz
Question 1
For the interval estimation of μ when σ is known and the sample is large, the proper distribution to use is
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the normal distribution |
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the t distribution with n degrees of freedom |
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the t distribution with n + 1 degrees of freedom |
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the t distribution with n + 2 degrees of freedom |
Question 2
An estimate of a population parameter that provides an interval of values believed to contain the value of the parameter is known as the
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confidence level |
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interval estimate |
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parameter value |
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population estimate |
Question 3
The value added and subtracted from a point estimate in order to develop an interval estimate of the population parameter is known as the
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confidence level |
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margin of error |
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parameter estimate |
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interval estimate |
Question 4
Whenever the population standard deviation is unknown and the population has a normal or near-normal distribution, which distribution is used in developing an interval estimation?
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standard distribution |
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z distribution |
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alpha distribution |
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t distribution |
Question 5
The z value for a 97.8% confidence interval estimation is
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2.02 |
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1.96 |
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2.00 |
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2.29 |
Question 6
The t value for a 95% confidence interval estimation with 24 degrees of freedom is
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1.711 |
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2.064 |
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2.492 |
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2.069 |
Question 7
As the sample size increases, the margin of error
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increases |
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decreases |
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stays the same |
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increases or decreases depending on the size of the mean |
Question 8
The ability of an interval estimate to contain the value of the population parameter is described by the
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confidence level |
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degrees of freedom |
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precise value of the population mean μ |
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degrees of freedom minus 1 |
Question 9
In general, higher confidence levels provide
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wider confidence intervals |
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narrower confidence intervals |
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a smaller standard error |
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unbiased estimates |
Question 10
An interval estimate is a range of values used to estimate
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the shape of the population's distribution |
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the sampling distribution |
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a sample statistic |
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a population parameter |
Question 11
As the number of degrees of freedom for a t distribution increases, the difference between the t distribution and the standard normal distribution
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becomes larger |
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becomes smaller |
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stays the same |
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becomes negative |
Question 12
In order to determine an interval for the mean of a population with unknown standard deviation a sample of 61 items is selected. The mean of the sample is determined to be 23. The number of degrees of freedom for reading the t value is
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22 |
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23 |
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60 |
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61 |
Question 13
After computing a confidence interval, the user believes the results are meaningless because the width of the interval is too large. Which one of the following is the best recommendation?
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Increase the level of confidence for the interval. |
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Decrease the sample size. |
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Increase the sample size. |
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Reduce the population variance. |
Question 14
A sample of 225 elements from a population with a standard deviation of 75 is selected. The sample mean is 180.The 95% confidence interval for μ is
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105.0 to 225.0 |
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175.0 to 185.0 |
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100.0 to 200.0 |
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170.2 to 189.8 |
Question 15
The sample size needed to provide a margin of error of 2 or less with a .95 probability when the population standard deviation equals 11 is
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10 |
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11 |
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116 |
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117 |
W5 Quiz
QUESTION 1
1.
For the interval estimation of μ when σ is known and the sample is large, the
proper distribution to use is
the normal distribution
the t distribution with n degrees of freedom
the t distribution with n + 1 degrees of freedom
the t distribution with n + 2 degrees of freedom
QUESTION 2
1.
An estimate of a population parameter that provides an interval of values
believed to contain the value of the parameter is known as the
confidenc
e level
interval estimate
parameter value
population estimate
QUESTION 3
1.
The value added and subtracted from a point estimate in order to develop an
interval estimate of the population parameter is known as the
W5 Quiz
QUESTION 1
1.
For the interval estimation of μ when σ is known and the sample is large, the
proper distribution to use is
the normal distribution
the t distribution with n degrees of freedom
the t distribution with n + 1 degrees of freedom
the t distribution with n + 2 degrees of freedom
QUESTION 2
1.
An estimate of a population parameter that provides an interval of values
believed to contain the value of the parameter is known as the
confidence level
interval estimate
parameter value
population estimate
QUESTION 3
1.
The value added and subtracted from a point estimate in order to develop an
interval estimate of the population parameter is known as the
