Question 1

The standard deviation of a point estimator is called the

Accepted Answer

A) standard deviation 
B) standard error 
C) point estimator 
D) variance of estimation 
A) standard deviation 
B) standard error 
C) point estimator 
D) variance of estimation

Question 2

Four hundred people were asked whether gun laws should be more stringent.Three hundred said "yes," and 100 said "no." The point estimate of the proportion in the population who will respond "yes" is

Accepted Answer

A) 300 
B) approximately 300 
C) 0.75 
D) 0.25 
A) 300 
B) approximately 300 
C) 0.75 
D) 0.25

Question 3

The expected value of the random variable   Is

Accepted Answer

A) the standard error 
B) the sample size 
C) the size of the population 
D) None of these alternatives is correct. 
A) the standard error 
B) the sample size 
C) the size of the population 
D) None of these alternatives is correct.

Question 4

The SAT scores have an average of 1200 with a standard deviation of 60.A sample of 36 scores is selected.
a.What is the probability that the sample mean will be larger than 1224?
b.What is the probability that the sample mean will be less than 1230?
c.What is the probability that the sample mean will be between 1200 and 1214?
d.What is the probability that the sample mean will be greater than 1200?
e.What is the probability that the sample mean will be larger than 73.46?

Accepted Answer

a.0.0082
b

Question 5

The probability distribution of all possible values of the sample mean  Is

Accepted Answer

A) the probability density function of   
B) the sampling distribution of   
C) the grand mean,since it considers all possible values of the sample mean 
D) one,since it considers all possible values of the sample mean 
A) the probability density function of   
B) the sampling distribution of   
C) the grand mean,since it considers all possible values of the sample mean 
D) one,since it considers all possible values of the sample mean

Question 6

In a local university,10% of the students live in the dormitories.A random sample of 100 students is selected for a particular study.
a.What is the probability that the sample proportion (the proportion living in the dormitories)is between 0.172 and 0.178?
b.What is the probability that the sample proportion (the proportion living in the dormitories)is greater than 0.025?

Accepted Answer

The answer of In a local university,10% of the students...

Question 7

Random samples of size 17 are taken from a population that has 200 elements,a mean of 36,and a standard deviation of 8.Which of the following best describes the form of the sampling distribution of the sample mean for this situation?

Accepted Answer

A) approximately normal because the sample size is small relative to the population size 
B) approximately normal because of the central limit theorem 
C) exactly normal 
D) None of these alternatives is correct. 
A) approximately normal because the sample size is small relative to the population size 
B) approximately normal because of the central limit theorem 
C) exactly normal 
D) None of these alternatives is correct.

Question 8

Random samples of size 100 are taken from an infinite population whose population proportion is 0.2.The mean and standard deviation of the sample proportion are

Accepted Answer

A) 0.2 and .04 
B) 0.2 and 0.2 
C) 20 and .04 
D) 20 and 0.2 
A) 0.2 and .04 
B) 0.2 and 0.2 
C) 20 and .04 
D) 20 and 0.2

Question 9

A theorem that allows us to use the normal probability distribution to approximate the sampling distribution of sample means and sample proportions whenever the sample size is large is known as the

Accepted Answer

A) approximation theorem 
B) normal probability theorem 
C) central limit theorem 
D) central normality theorem 
A) approximation theorem 
B) normal probability theorem 
C) central limit theorem 
D) central normality theorem

Question 10

Doubling the size of the sample will

Accepted Answer

A) reduce the standard error of the mean to one-half its current value 
B) reduce the standard error of the mean to approximately 70% of its current value 
C) have no effect on the standard error of the mean 
D) double the standard error of the mean 
A) reduce the standard error of the mean to one-half its current value 
B) reduce the standard error of the mean to approximately 70% of its current value 
C) have no effect on the standard error of the mean 
D) double the standard error of the mean

Question 11

Exhibit 7-1
A random sample of 121 bottles of cologne showed an average content of 4 ounces.It is known that the standard deviation of the contents (i.e. ,of the population)is 0.22 ounces.
-Refer to Exhibit 7-1.In this problem the 0.22 is

Accepted Answer

A) a parameter 
B) a statistic 
C) the standard error of the mean 
D) the average content of colognes in the long run 
A) a parameter 
B) a statistic 
C) the standard error of the mean 
D) the average content of colognes in the long run

Question 12

A probability distribution for all possible values of a sample statistic is known as

Accepted Answer

A) a sample statistic 
B) a parameter 
C) simple random sampling 
D) a sampling distribution 
A) a sample statistic 
B) a parameter 
C) simple random sampling 
D) a sampling distribution

Question 13

A sample of 25 observations is taken from an infinite population.The sampling distribution of  Is

Accepted Answer

A) not normal since n  30 and n(1-P)> 30 
A) not normal since n  30 and n(1-P)> 30

Question 14

A population consists of 500 elements.We want to draw a simple random sample of 50 elements from this population.On the first selection,the probability of an element being selected is

Accepted Answer

A) 0.100 
B) 0.010 
C) 0.001 
D) 0.002 
A) 0.100 
B) 0.010 
C) 0.001 
D) 0.002

Question 15

The probability distribution of all possible values of the sample proportion  
Is the

Accepted Answer

A) probability density function   
B) sampling distribution of   
C) same   ,since it considers all possible values of the sample proportion 
D) sampling distribution   
A) probability density function   
B) sampling distribution of   
C) same   ,since it considers all possible values of the sample proportion 
D) sampling distribution

Question 16

Exhibit 7-2
A random sample of 10 examination papers in a course,which was given on a pass or fail basis,showed the following scores.
  
-Refer to Exhibit 7-2.The point estimate for the proportion of all students who passed the course is

Accepted Answer

A) 0.8 
B) 0.2 
C) 1.8 
D) 1.2 
A) 0.8 
B) 0.2 
C) 1.8 
D) 1.2

Question 17

There are 8,000 students at the University of Tennessee at Chattanooga.The average age of all the students is 24 years with a standard deviation of 9 years.A random sample of 36 students is selected.
a.Determine the standard error of the mean.
b.What is the probability that the sample mean will be larger than 19.5?
c.What is the probability that the sample mean will be between 25.5 and 27 years?

Accepted Answer

a.1.5
b.0.

Question 18

Random samples of size 81 are taken from an infinite population whose mean and standard deviation are 200 and 18,respectively.The distribution of the population is unknown.The mean and the standard error of the mean are

Accepted Answer

A) 200 and 18 
B) 81 and 18 
C) 9 and 2 
D) 200 and 2 
A) 200 and 18 
B) 81 and 18 
C) 9 and 2 
D) 200 and 2

Question 19

A simple random sample of 100 observations was taken from a large population.The sample mean and the standard deviation were determined to be 80 and 12 respectively.The standard error of the mean is

Accepted Answer

A) 1.20 
B) 0.12 
C) 8.00 
D) 0.80 
A) 1.20 
B) 0.12 
C) 8.00 
D) 0.80

Question 20

A subset of a population selected to represent the population is

Accepted Answer

A) a subset 
B) a sample 
C) a small population 
D) a parameter 
A) a subset 
B) a sample 
C) a small population 
D) a parameter

The standard deviation of a point estimator is called the

Four hundred people were asked whether gun laws should be more stringent.Three hundred said "yes," and 100 said "no." The point estimate of the proportion in the population who will respond "yes" is

The expected value of the random variable Is

The probability distribution of all possible values of the sample mean Is

Random samples of size 17 are taken from a population that has 200 elements,a mean of 36,and a standard deviation of 8.Which of the following best describes the form of the sampling distribution of the sample mean for this situation?

Random samples of size 100 are taken from an infinite population whose population proportion is 0.2.The mean and standard deviation of the sample proportion are

A theorem that allows us to use the normal probability distribution to approximate the sampling distribution of sample means and sample proportions whenever the sample size is large is known as the

Doubling the size of the sample will

Exhibit 7-1 A random sample of 121 bottles of cologne showed an average content of 4 ounces.It is known that the standard deviation of the contents (i.e. ,of the population)is 0.22 ounces. -Refer to Exhibit 7-1.In this problem the 0.22 is

A probability distribution for all possible values of a sample statistic is known as

A sample of 25 observations is taken from an infinite population.The sampling distribution of Is

A population consists of 500 elements.We want to draw a simple random sample of 50 elements from this population.On the first selection,the probability of an element being selected is

The probability distribution of all possible values of the sample proportion Is the

Exhibit 7-2 A random sample of 10 examination papers in a course,which was given on a pass or fail basis,showed the following scores. -Refer to Exhibit 7-2.The point estimate for the proportion of all students who passed the course is

Random samples of size 81 are taken from an infinite population whose mean and standard deviation are 200 and 18,respectively.The distribution of the population is unknown.The mean and the standard error of the mean are

A simple random sample of 100 observations was taken from a large population.The sample mean and the standard deviation were determined to be 80 and 12 respectively.The standard error of the mean is

A subset of a population selected to represent the population is

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Introduction to Probability

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Statistical Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit and Independence

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Exam 7: Sampling and Sampling Distributions

The standard deviation of a point estimator is called the

Four hundred people were asked whether gun laws should be more stringent.Three hundred said "yes," and 100 said "no." The point estimate of the proportion in the population who will respond "yes" is

The expected value of the random variable Is

The probability distribution of all possible values of the sample mean Is

Random samples of size 17 are taken from a population that has 200 elements,a mean of 36,and a standard deviation of 8.Which of the following best describes the form of the sampling distribution of the sample mean for this situation?

Random samples of size 100 are taken from an infinite population whose population proportion is 0.2.The mean and standard deviation of the sample proportion are

A theorem that allows us to use the normal probability distribution to approximate the sampling distribution of sample means and sample proportions whenever the sample size is large is known as the

Doubling the size of the sample will

Exhibit 7-1 A random sample of 121 bottles of cologne showed an average content of 4 ounces.It is known that the standard deviation of the contents (i.e. ,of the population)is 0.22 ounces. -Refer to Exhibit 7-1.In this problem the 0.22 is

A probability distribution for all possible values of a sample statistic is known as

A sample of 25 observations is taken from an infinite population.The sampling distribution of Is

A population consists of 500 elements.We want to draw a simple random sample of 50 elements from this population.On the first selection,the probability of an element being selected is

The probability distribution of all possible values of the sample proportion Is the

Exhibit 7-2 A random sample of 10 examination papers in a course,which was given on a pass or fail basis,showed the following scores. -Refer to Exhibit 7-2.The point estimate for the proportion of all students who passed the course is

Random samples of size 81 are taken from an infinite population whose mean and standard deviation are 200 and 18,respectively.The distribution of the population is unknown.The mean and the standard error of the mean are

A simple random sample of 100 observations was taken from a large population.The sample mean and the standard deviation were determined to be 80 and 12 respectively.The standard error of the mean is

A subset of a population selected to represent the population is

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Interval Estimation

Hypothesis Tests

Statistical Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit and Independence

Analysis of Variance and Experimental Design

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Index Numbers

Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters