Question 1

Which of the following is an example illustrating the use of variance?

Accepted Answer

A)  As a measure of risk. 
B)  As a judge of consistency. 
C)  To search for and reduce variability in a process. 
D)  All of these choices are true. 
A)  As a measure of risk. 
B)  As a judge of consistency. 
C)  To search for and reduce variability in a process. 
D)  All of these choices are true.

Question 2

Concert Tickets
A simple random sample of 100 concert tickets was drawn from a normal population.The mean and standard deviation of the sample were $120 and $25, respectively.
-{Concert Tickets Narrative} Estimate the population mean with 90% confidence.

Accepted Answer

@#IMG-DLM& .Thus, LC

Question 3

Because of the greater uncertainty, the t-statistic will display greater ____________________ than the z-statistic.

Accepted Answer

variabilit

Question 4

In order to interpret the p-value associated with hypothesis testing about the population mean $\mu$, it is necessary to know the value of the test statistic.

Accepted Answer

A) True 
 B)False

Question 5

New Mousetrap
After a financial analysis, the general manager of a large company decided that if more than 8% of potential buyers of a new mousetrap purchase that product, the company would show a profit.In a preliminary survey of 500 potential buyers, 56 people say that they will buy the mousetrap.
-{New Mousetrap Narrative} State the appropriate null and alternative hypotheses.

Accepted Answer

H₀: p = 0.0

Question 6

Estimating or testing for p is used in situations when the data are ____________________.

Accepted Answer

The answer of Estimating or testing for p is used...

Question 7

Physicians
A random sample of 200 physicians shows that there are 36 of them who make at least $400,000 a year.
-{Physicians Narrative} Construct a 99% confidence interval estimate of the population proportion of physicians who make at least $400,000 a year, and explain how to use it to test the hypotheses.

Accepted Answer

@#IMG-DLM& .Thus, LCL = 0.10, and UCL =

Question 8

A random sample is drawn from a normal distribution with mean$\mu$and variance $\sigma$2.The random variable (n - 1)S2 / $\sigma$2 has a chi-squared probability distribution with n degrees of freedom.

Accepted Answer

A) True 
 B)False

Question 9

Under what condition(s) does the test statistic for p have an approximate normal distribution?

Accepted Answer

A)  When np > 5. 
B)  When np and np(1 - p) are both > 5. 
C)  When n > 30. 
D)  When np and n(1 - p) are both > 5. 
A)  When np > 5. 
B)  When np and np(1 - p) are both > 5. 
C)  When n > 30. 
D)  When np and n(1 - p) are both > 5.

Question 10

____________________ refers to the mass production and marketing by a company of a single product for the entire market.

Accepted Answer

The answer of ____________________ refers to the mass production and...

Question 11

The sum of squared deviations from the mean divided by the population variance has a(n) ____________________ distribution with ____________________ degrees of freedom.

Accepted Answer

chi-square

Question 12

Healthy Foods
In segmenting the frozen meal market in Spain, a food manufacturer uses health and diet consciousness as the segmentation variable.Four segments are developed and coded as follows:
   To distinguish between groups, surveys are conducted.On the basis of a questionnaire, people are categorized as belonging to one of these groups.A recent survey asked a random sample of 1,500 Spanish adults (20 and over) to complete the survey.Out of the 1,500 people surveyed, 360 indicated that they are concerned about eating healthy foods.The most recent information available reveals that there are 40,256,000 Spanish adults who are 20 and over.
-{Healthy Foods Narrative} What is the point estimate of the proportion p of Spanish adults who classify themselves as concerned about eating healthy?

Accepted Answer

@#IMG-DLM& = x / n =

Question 13

The use of the standard normal distribution for constructing confidence interval estimate for the population proportion p requires:

Accepted Answer

A)  nand n(1 -0) both greater than 5. 
B)  np and n(1- p) both greater than 5. 
C)  n(1 +) and n(1 -) both greater than 5. 
D)  sample size greater than 5. 
A)  nand n(1 -0) both greater than 5. 
B)  np and n(1- p) both greater than 5. 
C)  n(1 +) and n(1 -) both greater than 5. 
D)  sample size greater than 5.

Question 14

Healthy Foods
In segmenting the frozen meal market in Spain, a food manufacturer uses health and diet consciousness as the segmentation variable.Four segments are developed and coded as follows:
   To distinguish between groups, surveys are conducted.On the basis of a questionnaire, people are categorized as belonging to one of these groups.A recent survey asked a random sample of 1,500 Spanish adults (20 and over) to complete the survey.Out of the 1,500 people surveyed, 360 indicated that they are concerned about eating healthy foods.The most recent information available reveals that there are 40,256,000 Spanish adults who are 20 and over.
-{Healthy Foods Narrative} Estimate with 95% confidence thee number of Spanish adults who classify themselves as concerned about eating healthy.

Accepted Answer

The answer of Healthy Foods
In segmenting the frozen meal market...

Question 15

The statistic s2 is an unbiased and consistent estimator of $\sigma$2.

Accepted Answer

A) True 
 B)False

Question 16

The chi-squared distribution can be used in constructing confidence intervals and carrying out hypothesis tests regarding the value of a population variance.

Accepted Answer

A) True 
 B)False

Question 17

The ____________________ confidence limit of the confidence interval estimator of the population variance is   .

Accepted Answer

The answer of The ____________________ confidence limit of the confidence...

Question 18

Tire Rotation
The manager of a service station is in the process of analyzing the number of times car owners rotate the tires on their cars.She believes that the average motorist rotates his or her car's tires less frequently than recommended by the owner's manual (two times per year).In a preliminary survey she asked 14 car owners how many times they rotated their cars' tires in the last 12 months.The results are 1, 1, 2, 0, 3, 3, 0, 1, 0, 1, 2, 3, 3, and 1.
-{Tire Rotation Narrative} What condition is required in order to analyze this data using a t-test?

Accepted Answer

The number of times

Question 19

Energy Drink Consumption
A researcher at the University of Washington medical school believes that energy drink consumption may increase heart rate.Suppose it is known that heart rate (in beats per minute) is normally distributed with an average of 70 bpm for adults.A random sample of 25 adults was selected and it was found that their average heartbeat was 73 bpm after energy drink consumption, with a standard deviation of 7 bpm.
-{Energy Drink Consumption Narrative} Formulate the null and alternative hypotheses.

Accepted Answer

The answer of Energy Drink Consumption
A researcher at the University...

Question 20

When a population is small, it is necessary to include the ____________________ factor in our hypothesis tests and confidence interval estimators for p.

Accepted Answer

finite pop

Which of the following is an example illustrating the use of variance?

Concert Tickets A simple random sample of 100 concert tickets was drawn from a normal population.The mean and standard deviation of the sample were $120 and $25, respectively. -{Concert Tickets Narrative} Estimate the population mean with 90% confidence.

Because of the greater uncertainty, the t-statistic will display greater ____________________ than the z-statistic.

In order to interpret the p-value associated with hypothesis testing about the population mean $\mu$ , it is necessary to know the value of the test statistic.

Estimating or testing for p is used in situations when the data are ____________________.

A random sample is drawn from a normal distribution with mean $\mu$ and variance $\sigma$ ².The random variable (n - 1)S² / $\sigma$ ²has a chi-squared probability distribution with n degrees of freedom.

Under what condition(s) does the test statistic for p have an approximate normal distribution?

____________________ refers to the mass production and marketing by a company of a single product for the entire market.

The sum of squared deviations from the mean divided by the population variance has a(n) distribution with degrees of freedom.

The use of the standard normal distribution for constructing confidence interval estimate for the population proportion p requires:

The statistic s² is an unbiased and consistent estimator of $\sigma$ ².

The chi-squared distribution can be used in constructing confidence intervals and carrying out hypothesis tests regarding the value of a population variance.

The ____________________ confidence limit of the confidence interval estimator of the population variance is .

When a population is small, it is necessary to include the ____________________ factor in our hypothesis tests and confidence interval estimators for p.

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

Numerical Descriptive Techniques

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Filters

Exam 12: Inference About a Population

Which of the following is an example illustrating the use of variance?

Concert Tickets A simple random sample of 100 concert tickets was drawn from a normal population.The mean and standard deviation of the sample were $120 and $25, respectively. -{Concert Tickets Narrative} Estimate the population mean with 90% confidence.

Because of the greater uncertainty, the t-statistic will display greater ____________________ than the z-statistic.

In order to interpret the p-value associated with hypothesis testing about the population mean μ\muμ , it is necessary to know the value of the test statistic.

Estimating or testing for p is used in situations when the data are ____________________.

A random sample is drawn from a normal distribution with mean μ\muμ and variance σ\sigmaσ 2.The random variable (n - 1)S2 / σ\sigmaσ 2 has a chi-squared probability distribution with n degrees of freedom.

Under what condition(s) does the test statistic for p have an approximate normal distribution?

____________________ refers to the mass production and marketing by a company of a single product for the entire market.

The sum of squared deviations from the mean divided by the population variance has a(n) ____________________ distribution with ____________________ degrees of freedom.

The use of the standard normal distribution for constructing confidence interval estimate for the population proportion p requires:

The statistic s2 is an unbiased and consistent estimator of σ\sigmaσ 2.

The chi-squared distribution can be used in constructing confidence intervals and carrying out hypothesis tests regarding the value of a population variance.

The ____________________ confidence limit of the confidence interval estimator of the population variance is .

When a population is small, it is necessary to include the ____________________ factor in our hypothesis tests and confidence interval estimators for p.

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

Numerical Descriptive Techniques

Data Collection and Sampling

Probability

Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

Simple Linear Regression and Correlation

Multiple Regression

Filters

In order to interpret the p-value associated with hypothesis testing about the population mean $\mu$ , it is necessary to know the value of the test statistic.

A random sample is drawn from a normal distribution with mean $\mu$ and variance $\sigma$ ².The random variable (n - 1)S² / $\sigma$ ²has a chi-squared probability distribution with n degrees of freedom.

The sum of squared deviations from the mean divided by the population variance has a(n) distribution with degrees of freedom.

The statistic s² is an unbiased and consistent estimator of $\sigma$ ².