Question 1

Whenever using the t distribution in interval estimation, we must assume that _____.

Accepted Answer

A)  the sample size is less than 30 
B)  a random sample was selected 
C)  the population is approximately normal 
D)  the finite population correction factor is necessary 
A)  the sample size is less than 30 
B)  a random sample was selected 
C)  the population is approximately normal 
D)  the finite population correction factor is necessary

Question 2

The t value with a 95% confidence and 24 degrees of freedom is _____.

Accepted Answer

A)  1.711 
B)  2.064 
C)  2.492 
D)  2.069 
A)  1.711 
B)  2.064 
C)  2.492 
D)  2.069

Question 3

If an interval estimate is said to be constructed at the 90% confidence level, the confidence coefficient would be _____.

Accepted Answer

A)  .1 
B)  .95 
C)  .9 
D)  .05 
A)  .1 
B)  .95 
C)  .9 
D)  .05

Question 4

A newspaper wants to estimate the proportion of Americans who will vote for Candidate A. A random sample of 1000 voters is selected. Of the 1000 respondents, 526 say that they will vote for Candidate A. Which Excel function would be used to construct a confidence interval estimate?

Accepted Answer

A)  NORM.S.INV 
B)  NORM.INV 
C)  T.INV 
D)  INT 
A)  NORM.S.INV 
B)  NORM.INV 
C)  T.INV 
D)  INT

Question 5

A local university administers a comprehensive examination to the recipients of a B.S. degree in Business Administration. A sample of five examinations is selected at random and scored. The scores are shown below. Grade
56
85
65
86
93 Use Excel to determine an interval estimate for the mean of the population at a 98% confidence level. Interpret your results.

Accepted Answer

​ @#IMG-DLM& Interpretation of Interval Estimate:

Question 6

If we want to provide a 95% confidence interval for the mean of a population, the confidence coefficient is _____.

Accepted Answer

A)  .485 
B)  1.96 
C)  .95 
D)  1.645 
A)  .485 
B)  1.96 
C)  .95 
D)  1.645

Question 7

It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken to estimate the population mean if the desired margin of error is 5 or less is

Accepted Answer

A)  25 
B)  74 
C)  189 
D)  75 
A)  25 
B)  74 
C)  189 
D)  75

Question 8

In developing an interval estimate of the population mean, if the population standard deviation is unknown _____.

Accepted Answer

A)  it is impossible to develop an interval estimate 
B)  a sample proportion can be used 
C)  the sample standard deviation and t distribution can be used 
D)  None of the answers is correct. 
A)  it is impossible to develop an interval estimate 
B)  a sample proportion can be used 
C)  the sample standard deviation and t distribution can be used 
D)  None of the answers is correct.

Question 9

The degrees of freedom associated with a t distribution are a function of the _____.

Accepted Answer

A)  area in the upper tail 
B)  sample standard deviation 
C)  confidence coefficient 
D)  sample size 
A)  area in the upper tail 
B)  sample standard deviation 
C)  confidence coefficient 
D)  sample size

Question 10

Whenever using the t distribution in interval estimation, we must assume that _____.

Accepted Answer

A)  the sample size is less than 30 
B)  a random sample was selected 
C)  the population is approximately normal 
D)  the finite population correction factor is necessary 
A)  the sample size is less than 30 
B)  a random sample was selected 
C)  the population is approximately normal 
D)  the finite population correction factor is necessary

Question 11

Using α = .04, a confidence interval for a population proportion is determined to be .65 to .75. If the level of significance is decreased, the interval for the population proportion _____.

Accepted Answer

A)  becomes narrower 
B)  becomes wider 
C)  does not change 
D)  Not enough information is provided to answer this question. 
A)  becomes narrower 
B)  becomes wider 
C)  does not change 
D)  Not enough information is provided to answer this question.

Question 12

For which of the following values of p is the value of P(1 − p) maximized?

Accepted Answer

A)  p = .99 
B)  p = .90 
C)  p = 1.0 
D)  p = .50 
A)  p = .99 
B)  p = .90 
C)  p = 1.0 
D)  p = .50

Question 13

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 14

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 15

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

Question 16

A sample of 26 elements from a normally distributed population is selected. The sample mean is 10 with a standard deviation of 4. The 95% confidence interval for μ is _____.

Accepted Answer

A)  6.000 to 14.000 
B)  9.846 to 10.154 
C)  8.384 to 11.616 
D)  8.462 to 11.538 
A)  6.000 to 14.000 
B)  9.846 to 10.154 
C)  8.384 to 11.616 
D)  8.462 to 11.538

Question 17

A marketing firm is developing a new television advertisement for a large discount retail chain. A sample of 30 people is shown two potential ads and asked their preference. The results for ad #1 follow. Use Excel to develop a 95% confidence interval estimate of the proportion of people in the population who will prefer ad #1. $\text { Prefer Advertis ement \# } 1$
$\begin{array}{llllll}
\text { yes } & \text { no } & \text { no } & \text { yes } & \text { yes } & \text { no } \
\text { no } & \text { no } & \text { no } & \text { yes } & \text { no } & \text { yes } \
\text { no } & \text { no } & \text { yes } & \text { yes } & \text { yes } & \text { no } \
\text { yes } & \text { yes } & \text { no } & \text { no } & \text { no } & \text { yes } \
\text { yes } & \text { no } & \text { yes } & \text { yes } & \text { no } & \text { no }
\end{array}$

Accepted Answer

The answer of A marketing firm is developing a new...

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

The degrees of freedom associated with a t distribution are a function of the _____.

Accepted Answer

A)  area in the upper tail 
B)  sample standard deviation 
C)  confidence coefficient 
D)  sample size 
A)  area in the upper tail 
B)  sample standard deviation 
C)  confidence coefficient 
D)  sample size

Question 20

An interval estimate is used to estimate _____.

Accepted Answer

A)  the shape of the population's distribution 
B)  the sampling distribution 
C)  a sample statistic 
D)  a population parameter 
A)  the shape of the population's distribution 
B)  the sampling distribution 
C)  a sample statistic 
D)  a population parameter

Whenever using the t distribution in interval estimation, we must assume that _____.

The t value with a 95% confidence and 24 degrees of freedom is _____.

If an interval estimate is said to be constructed at the 90% confidence level, the confidence coefficient would be _____.

A newspaper wants to estimate the proportion of Americans who will vote for Candidate A. A random sample of 1000 voters is selected. Of the 1000 respondents, 526 say that they will vote for Candidate A. Which Excel function would be used to construct a confidence interval estimate?

If we want to provide a 95% confidence interval for the mean of a population, the confidence coefficient is _____.

It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken to estimate the population mean if the desired margin of error is 5 or less is

In developing an interval estimate of the population mean, if the population standard deviation is unknown _____.

The degrees of freedom associated with a t distribution are a function of the _____.

Whenever using the t distribution in interval estimation, we must assume that _____.

Using α = .04, a confidence interval for a population proportion is determined to be .65 to .75. If the level of significance is decreased, the interval for the population proportion _____.

For which of the following values of p is the value of P(1 − p) maximized?

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 _____.

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

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 _____.

A sample of 26 elements from a normally distributed population is selected. The sample mean is 10 with a standard deviation of 4. The 95% confidence interval for μ is _____.

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

The degrees of freedom associated with a t distribution are a function of the _____.

An interval estimate is used to estimate _____.

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

Whenever using the t distribution in interval estimation, we must assume that _____.

The t value with a 95% confidence and 24 degrees of freedom is _____.

If an interval estimate is said to be constructed at the 90% confidence level, the confidence coefficient would be _____.

A newspaper wants to estimate the proportion of Americans who will vote for Candidate A. A random sample of 1000 voters is selected. Of the 1000 respondents, 526 say that they will vote for Candidate A. Which Excel function would be used to construct a confidence interval estimate?

If we want to provide a 95% confidence interval for the mean of a population, the confidence coefficient is _____.

It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken to estimate the population mean if the desired margin of error is 5 or less is

In developing an interval estimate of the population mean, if the population standard deviation is unknown _____.

The degrees of freedom associated with a t distribution are a function of the _____.

Whenever using the t distribution in interval estimation, we must assume that _____.

Using α = .04, a confidence interval for a population proportion is determined to be .65 to .75. If the level of significance is decreased, the interval for the population proportion _____.

For which of the following values of p is the value of P(1 − p) maximized?

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 _____.

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

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 _____.

A sample of 26 elements from a normally distributed population is selected. The sample mean is 10 with a standard deviation of 4. The 95% confidence interval for μ is _____.

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

The degrees of freedom associated with a t distribution are a function of the _____.

An interval estimate is used to estimate _____.

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 _____.