Question 1

As the sample size becomes larger, the sampling distribution of the sample mean approaches a

Accepted Answer

A) binomial distribution 
B) Poisson distribution 
C) normal distribution 
D) chi-square distribution 
A) binomial distribution 
B) Poisson distribution 
C) normal distribution 
D) chi-square distribution

Question 2

A population has a mean of 84 and a standard deviation of 12. A sample of 36 observations will be taken. The probability that the sample mean will be between 80.54 and 88.9 is

Accepted Answer

A) 0.0347 
B) 0.7200 
C) 0.9511 
D) 8.3600 
A) 0.0347 
B) 0.7200 
C) 0.9511 
D) 8.3600

Question 3

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 4

The following information was collected from a simple random sample of a population. 16
19 18 17 20 18
The point estimate of the population standard deviation is

Accepted Answer

A) 2.000 
B) 1.291 
C) 1.414 
D) 1.667 
A) 2.000 
B) 1.291 
C) 1.414 
D) 1.667

Question 5

A random sample of 150 people was taken from a very large population. Ninety of the people in the sample were female. The standard error of the proportion is

Accepted Answer

A) 0.0016 
B) 0.2400 
C) 0.1600 
D) 0.0400 
A) 0.0016 
B) 0.2400 
C) 0.1600 
D) 0.0400

Question 6

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 standard deviation of the population is

Accepted Answer

A) 419.43 
B) 20.48 
C) 75 
D) 750 
A) 419.43 
B) 20.48 
C) 75 
D) 750

Question 7

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 mean of the population is

Accepted Answer

A) 750 
B) 100 
C) 85 
D) 75 
A) 750 
B) 100 
C) 85 
D) 75

Question 8

A random sample of nine telephone calls in an office provided the following information.   
a.Determine the point estimate for the average duration of all calls.
b.What is the point estimate for the standard deviation of the population?
c.Determine the standard error of the mean.
d.What is the point estimate for the proportion of all calls that were long distance?
e.Determine the standard error of proportion.

Accepted Answer

a.5
b.2
c.

Question 9

How many simple random samples of size 3 can be selected from a population of size 7?

Accepted Answer

A) 7 
B) 21 
C) 35 
D) 343 
A) 7 
B) 21 
C) 35 
D) 343

Question 10

A bank has kept records of the checking balances of its customers and determined that the average daily balance of its customers is $300 with a standard deviation of $48. A random sample of 144 checking accounts is selected.
a.What is the probability that the sample mean will be more than $306.60?
b.What is the probability that the sample mean will be less than $308?
c.What is the probability that the sample mean will be between $302 and $308?
d.What is the probability that the sample mean will be at least $296?

Accepted Answer

a.0.0495
b

Question 11

The sample statistic s is the point estimator of

Accepted Answer

A) $\mu$ 
B) $\sigma$ 
C)    
D)    
A) $\mu$ 
B) $\sigma$ 
C)    
D)

Question 12

As a rule of thumb, the sampling distribution of the sample proportions can be approximated by a normal probability distribution whenever

Accepted Answer

A) np   5 
B) n(1 - p)   5 and n   30 
C) n   30 and (1 - p) = 0.5 
D) None of these alternatives is correct. 
A) np   5 
B) n(1 - p)   5 and n   30 
C) n   30 and (1 - p) = 0.5 
D) None of these alternatives is correct.

Question 13

From a group of 12 students, we want to select a random sample of 4 students to serve on a university committee. How many combination of random samples of 4 students can be selected?

Accepted Answer

A) 48 
B) 20,736 
C) 16 
D) 495 
A) 48 
B) 20,736 
C) 16 
D) 495

As the sample size becomes larger, the sampling distribution of the sample mean approaches a

A population has a mean of 84 and a standard deviation of 12. A sample of 36 observations will be taken. The probability that the sample mean will be between 80.54 and 88.9 is

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

The following information was collected from a simple random sample of a population. 16 19 18 17 20 18 The point estimate of the population standard deviation is

A random sample of 150 people was taken from a very large population. Ninety of the people in the sample were female. The standard error of the proportion is

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 standard deviation of the population is

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 mean of the population is

How many simple random samples of size 3 can be selected from a population of size 7?

The sample statistic s is the point estimator of

As a rule of thumb, the sampling distribution of the sample proportions can be approximated by a normal probability distribution whenever

From a group of 12 students, we want to select a random sample of 4 students to serve on a university committee. How many combination of random samples of 4 students can be selected?

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Comparing Multiple Proportions, Test of Independence and Goodness of Fit

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

Index Numbers

Decision Analysis on Website

Sample Survey on Website

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Exam 7: Sampling and Sampling Distributions

As the sample size becomes larger, the sampling distribution of the sample mean approaches a

A population has a mean of 84 and a standard deviation of 12. A sample of 36 observations will be taken. The probability that the sample mean will be between 80.54 and 88.9 is

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

The following information was collected from a simple random sample of a population. 16 19 18 17 20 18 The point estimate of the population standard deviation is

A random sample of 150 people was taken from a very large population. Ninety of the people in the sample were female. The standard error of the proportion is

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 standard deviation of the population is

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 mean of the population is

How many simple random samples of size 3 can be selected from a population of size 7?

The sample statistic s is the point estimator of

As a rule of thumb, the sampling distribution of the sample proportions can be approximated by a normal probability distribution whenever

From a group of 12 students, we want to select a random sample of 4 students to serve on a university committee. How many combination of random samples of 4 students can be selected?

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Comparing Multiple Proportions, Test of Independence and Goodness of Fit

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

Index Numbers

Decision Analysis on Website

Sample Survey on Website

Filters