Question 1

The ability of an interval estimate to contain the value of the population parameter is described by the _____.

Accepted Answer

A)  confidence level 
B)  degrees of freedom 
C)  precise value of the population mean μ 
D)  None of the answers is correct. 
A)  confidence level 
B)  degrees of freedom 
C)  precise value of the population mean μ 
D)  None of the answers is correct. A

Question 2

If the margin of error in an interval estimate of ? is 4.6, the interval estimate equals _____.

Accepted Answer

A)  $\bar { x } \pm 2.3$ 
B)  $\bar { x } \pm 4.6$ 
C)  $\bar { x } \pm 4.508$ 
D)  $\bar { x } \pm 6.9$ 
A)  $\bar { x } \pm 2.3$ 
B)  $\bar { x } \pm 4.6$ 
C)  $\bar { x } \pm 4.508$ 
D)  $\bar { x } \pm 6.9$ B

Question 3

The sample size that guarantees all estimates of proportions will meet the margin of error requirements is computed using a planning value of p equal to _____.

Accepted Answer

A)  .01 
B)  .50 
C)  .51 
D)  .99 
A)  .01 
B)  .50 
C)  .51 
D)  .99 B

Question 4

In general, higher confidence levels provide _____.

Accepted Answer

A)  wider confidence intervals 
B)  narrower confidence intervals 
C)  a smaller standard error 
D)  unbiased estimates 
A)  wider confidence intervals 
B)  narrower confidence intervals 
C)  a smaller standard error 
D)  unbiased estimates

Question 5

The t distribution is a family of similar probability distributions, with each individual distribution depending on a parameter known as the _____.

Accepted Answer

A)  finite correction factor 
B)  sample size 
C)  degrees of freedom 
D)  standard deviation 
A)  finite correction factor 
B)  sample size 
C)  degrees of freedom 
D)  standard deviation

Question 6

To compute the minimum sample size for an interval estimate of μ when the population standard deviation is known, we must first determine all of the following EXCEPT _____.

Accepted Answer

A)  desired margin of error 
B)  confidence level 
C)  population standard deviation 
D)  degrees of freedom 
A)  desired margin of error 
B)  confidence level 
C)  population standard deviation 
D)  degrees of freedom

Question 7

For the interval estimation of μ when σ is assumed known, the proper distribution to use is the_____.

Accepted Answer

A)  standard normal distribution 
B)  t distribution with n degrees of freedom 
C)  t distribution with n − 1 degrees of freedom 
D)  t distribution with n − 2 degrees of freedom 
A)  standard normal distribution 
B)  t distribution with n degrees of freedom 
C)  t distribution with n − 1 degrees of freedom 
D)  t distribution with n − 2 degrees of freedom

Question 8

The confidence associated with an interval estimate is called the _____.

Accepted Answer

A)  level of significance 
B)  degree of association 
C)  confidence level 
D)  precision 
A)  level of significance 
B)  degree of association 
C)  confidence level 
D)  precision

Question 9

Whenever the population standard deviation is unknown, which distribution is used in developing an interval estimate for a population mean?

Accepted Answer

A)  standard distribution 
B)  z distribution 
C)  binomial distribution 
D)  t distribution 
A)  standard distribution 
B)  z distribution 
C)  binomial distribution 
D)  t distribution

Question 10

Computing the necessary sample size for an interval estimate of a population proportion requires a planning value for $\bar{p}$ . In case of any uncertainty about an appropriate planning value, we know the value that will provide the largest sample size for a given level of confidence and a given margin of error is

Accepted Answer

A)  .10 
B)  .50 
C)  .90 
D)  1 
A)  .10 
B)  .50 
C)  .90 
D)  1

Question 11

Below you are given ages that were obtained by taking a random sample of nine undergraduate students. $\begin{array} { l  }
19&22&23&19&21&22&19&23&21
\end{array}$
 Use Excel to determine an interval estimate for the mean of the population at a 99% confidence level. Interpret your results.

Accepted Answer

​ @#IMG-DLM& Interpretation of Interval

Question 12

The ability of an interval estimate to contain the value of the population parameter is described by the _____.

Accepted Answer

A)  confidence level 
B)  degrees of freedom 
C)  precise value of the population mean μ 
D)  None of the answers is correct. 
A)  confidence level 
B)  degrees of freedom 
C)  precise value of the population mean μ 
D)  None of the answers is correct.

Question 13

We can reduce the margin of error in an interval estimate of p by doing any of the following EXCEPT _____.

Accepted Answer

A)  increasing the sample size 
B)  using a planning value p* closer to .5 
C)  increasing the level of significance 
D)  reducing the confidence coefficient 
A)  increasing the sample size 
B)  using a planning value p* closer to .5 
C)  increasing the level of significance 
D)  reducing the confidence coefficient

Question 14

Computing the necessary sample size for an interval estimate of a population proportion requires a planning value for $\bar{p}$ . In case of any uncertainty about an appropriate planning value, we know the value that will provide the largest sample size for a given level of confidence and a given margin of error is

Accepted Answer

A)  .10 
B)  .50 
C)  .90 
D)  1 
A)  .10 
B)  .50 
C)  .90 
D)  1

Question 15

The expression used to compute an interval estimate of μ may depend on any of the following factors EXCEPT _____.

Accepted Answer

A)  the sample size 
B)  whether the population standard deviation is known 
C)  whether the population has an approximately normal distribution 
D)  whether there is sampling error 
A)  the sample size 
B)  whether the population standard deviation is known 
C)  whether the population has an approximately normal distribution 
D)  whether there is sampling error

Question 16

From a population that is normally distributed with an unknown standard deviation, a sample of 25 elements is selected. For the interval estimation of μ, the proper distribution to use is the _____.

Accepted Answer

A)  standard normal distribution 
B)  z distribution 
C)  t distribution with 26 degrees of freedom 
D)  t distribution with 24 degrees of freedom 
A)  standard normal distribution 
B)  z distribution 
C)  t distribution with 26 degrees of freedom 
D)  t distribution with 24 degrees of freedom

Question 17

A survey of 40 students at a local college asks, "Where do you buy the majority of your books?" The responses fell into three categories: "at the campus bookstore," "on the Internet," and "other." The results follow. Use Excel to estimate the proportion of the college students who buy their books on the Internet. $\begin{array} { l|l|l|l|l|l|  }
 \text {bookstore }&\text {bookstore }&\text { Internet}&\text { other }&\text { Internet}&\text { other }&\text {bookstore }\
\text { other} & \text { bookstore } & \text { bookstore } & \text { bookstore } & \text {bookstore } & \text {bookstore } & \text { other } \
\text { bookstore } & \text { bookstore } & \text { bookstore } & \text { Internet } & \text { Internet } & \text { other } & \text { other }\
\text { other } & \text { other } & \text { other } & \text { other } & \text { other } & \text { Internet } & \text { bookstore }\
\text { other }& \text { other } & \text { Internet} & \text { lother} & \text { bookstore } & \text {bookstore } & \text {other }\
\text { bookstore } & \text { Internet } & \text { Internet  } & \text {other } & \text { bookstore }\
\end{array}$

Accepted Answer

The answer of A survey of 40 students at a...

Question 18

The z value for a 97.8% confidence interval estimation is _____.

Accepted Answer

A)  2.02 
B)  1.96 
C)  2.00 
D)  2.29 
A)  2.02 
B)  1.96 
C)  2.00 
D)  2.29

Question 19

As the sample size increases, the margin of error _____.

Accepted Answer

A)  increases 
B)  decreases 
C)  stays the same 
D)  None of the answers is correct. 
A)  increases 
B)  decreases 
C)  stays the same 
D)  None of the answers is correct.

Question 20

The use of the normal probability distribution as an approximation of the sampling distribution of $\bar { p }$ is based on the condition that both np and n(1 - p) equal or exceed _____.

Accepted Answer

A)  .05 
B)  5 
C)  15 
D)  30 
A)  .05 
B)  5 
C)  15 
D)  30

The ability of an interval estimate to contain the value of the population parameter is described by the _____.

If the margin of error in an interval estimate of ? is 4.6, the interval estimate equals _____.

The sample size that guarantees all estimates of proportions will meet the margin of error requirements is computed using a planning value of p equal to _____.

In general, higher confidence levels provide _____.

The t distribution is a family of similar probability distributions, with each individual distribution depending on a parameter known as the _____.

To compute the minimum sample size for an interval estimate of μ when the population standard deviation is known, we must first determine all of the following EXCEPT _____.

For the interval estimation of μ when σ is assumed known, the proper distribution to use is the_____.

The confidence associated with an interval estimate is called the _____.

Whenever the population standard deviation is unknown, which distribution is used in developing an interval estimate for a population mean?

Below you are given ages that were obtained by taking a random sample of nine undergraduate students. 19 22 23 19 21 22 19 23 21 Use Excel to determine an interval estimate for the mean of the population at a 99% confidence level. Interpret your results.

The ability of an interval estimate to contain the value of the population parameter is described by the _____.

We can reduce the margin of error in an interval estimate of p by doing any of the following EXCEPT _____.

The expression used to compute an interval estimate of μ may depend on any of the following factors EXCEPT _____.

From a population that is normally distributed with an unknown standard deviation, a sample of 25 elements is selected. For the interval estimation of μ, the proper distribution to use is the _____.

The z value for a 97.8% confidence interval estimation is _____.

As the sample size increases, the margin of error _____.

The use of the normal probability distribution as an approximation of the sampling distribution of $\bar { p }$ is based on the condition that both np and n(1 - p) equal or exceed _____.

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit, Independence, and Multiple Proportions

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters

Exam 8: Interval Estimation

The ability of an interval estimate to contain the value of the population parameter is described by the _____.

If the margin of error in an interval estimate of ? is 4.6, the interval estimate equals _____.

The sample size that guarantees all estimates of proportions will meet the margin of error requirements is computed using a planning value of p equal to _____.

In general, higher confidence levels provide _____.

The t distribution is a family of similar probability distributions, with each individual distribution depending on a parameter known as the _____.

To compute the minimum sample size for an interval estimate of μ when the population standard deviation is known, we must first determine all of the following EXCEPT _____.

For the interval estimation of μ when σ is assumed known, the proper distribution to use is the_____.

The confidence associated with an interval estimate is called the _____.

Whenever the population standard deviation is unknown, which distribution is used in developing an interval estimate for a population mean?

Below you are given ages that were obtained by taking a random sample of nine undergraduate students. 19 22 23 19 21 22 19 23 21 Use Excel to determine an interval estimate for the mean of the population at a 99% confidence level. Interpret your results.

The ability of an interval estimate to contain the value of the population parameter is described by the _____.

We can reduce the margin of error in an interval estimate of p by doing any of the following EXCEPT _____.

The expression used to compute an interval estimate of μ may depend on any of the following factors EXCEPT _____.

From a population that is normally distributed with an unknown standard deviation, a sample of 25 elements is selected. For the interval estimation of μ, the proper distribution to use is the _____.

The z value for a 97.8% confidence interval estimation is _____.

As the sample size increases, the margin of error _____.

The use of the normal probability distribution as an approximation of the sampling distribution of pˉ\bar { p }pˉ​ is based on the condition that both np and n(1 - p) equal or exceed _____.

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit, Independence, and Multiple Proportions

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters

The use of the normal probability distribution as an approximation of the sampling distribution of $\bar { p }$ is based on the condition that both np and n(1 - p) equal or exceed _____.