Question 1

If a population is known to be normally distributed,then it follows that the sample standard deviation must equal  $\sigma$.

Accepted Answer

A) True 
 B)False

Question 2

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5.The sampling distribution of   ____________________.

Accepted Answer

A) Cannot be determined 
B) Is skewed to the left 
C) Normal 
D) Is skewed to the right 
A) Cannot be determined 
B) Is skewed to the left 
C) Normal 
D) Is skewed to the right

Question 3

The population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.2 inches.A sample of four metal sheets is randomly selected from a batch.What is the probability that the average length of a sheet is between 30.25 and 30.35 inches long?

Accepted Answer

A) 9773 
B) 0227 
C) 0386 
D) 0215 
A) 9773 
B) 0227 
C) 0386 
D) 0215

Question 4

In the upcoming governor's election,the most recent poll based on 900 respondents predicts that the incumbent will be reelected with 55% of the votes.For the sake of argument,assume that 51% of the actual voters in the state support the incumbent governor (p = 0.51).Calculate the probability of observing a sample proportion of voters 0.55 or higher supporting the incumbent governor.

Accepted Answer

A) 0166 
B) 0247 
C) 0082 
D) 9918 
A) 0166 
B) 0247 
C) 0082 
D) 9918

Question 5

A random sample of size 1,000 is taken from a population where p = .20.What is   ?

Accepted Answer

A) .006 
B) .20 
C) .02 
D) .16 
A) .006 
B) .20 
C) .02 
D) .16

Question 6

According to a hospital administrator,historical records over the past 10 years have shown that 20% of the major surgery patients are dissatisfied with after-surgery care in the hospital.A scientific poll based on 400 hospital patients has just been conducted. What is the probability that at least 70 patients will not be satisfied with the after-surgery care?

Accepted Answer

A) 89.44% 
B) 39.44% 
C) 10.56% 
D) 78.88% 
E) 84.49% 
A) 89.44% 
B) 39.44% 
C) 10.56% 
D) 78.88% 
E) 84.49%

Question 7

For any sampled population,the population of all sample means is approximately normally distributed.

Accepted Answer

A) True 
 B)False

Question 8

If a sample size is at least _____,then for any sampled population,we can conclude that the sample means are approximately normal.

Accepted Answer

A) 25 
B) 20 
C) 30 
D) 50 
A) 25 
B) 20 
C) 30 
D) 50

Question 9

A manufacturing company measures the weight of boxes before shipping them to the customers.If the box weights have a population mean and standard deviation of 90 lbs.and 24 lbs.respectively,then based on a sample size of 36 boxes,the probability that the average weight of the boxes will be less than 84 lbs.is:

Accepted Answer

A) 16.87% 
B) 93.32% 
C) 43.32% 
D) 6.678% 
E) 84.13% 
A) 16.87% 
B) 93.32% 
C) 43.32% 
D) 6.678% 
E) 84.13%

Question 10

The number of defectives in the samples of 100 observations each is the following: 1,2,1,0,2,3,1,4,2,1.What is the estimate of the population proportion of defectives?

Accepted Answer

A) .017 
B) .17 
C) .016 
D) .16 
A) .017 
B) .17 
C) .016 
D) .16

Question 11

If the sampled population is exactly normal distribution,then the sampling distribution of   is also expected to be normal regardless of the sample size.

Accepted Answer

A) True 
 B)False

Question 12

As the sample size increases,the standard deviation of the sampling distribution increases.

Accepted Answer

A) True 
 B)False

Question 13

The reason sample variance has a divisor of n-1 rather than n is that it makes the variance an unbiased estimate of the population variance.

Accepted Answer

A) True 
 B)False

Question 14

We can randomly select a sample from an infinite population of potential process measurements by sampling the process at different and equally spaced time points.

Accepted Answer

A) True 
 B)False

Question 15

As the sample size ___________,the standard deviation of the population of all sample proportions increases.

Accepted Answer

A) Increases 
B) Stays the same 
C) Is variable 
D) Decreases 
A) Increases 
B) Stays the same 
C) Is variable 
D) Decreases

Question 16

Find

Accepted Answer

A) .1587 
B) .8413 
C) .6293 
D) .3707 
A) .1587 
B) .8413 
C) .6293 
D) .3707

If a population is known to be normally distributed,then it follows that the sample standard deviation must equal $\sigma$ .

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5.The sampling distribution of ____________________.

A random sample of size 1,000 is taken from a population where p = .20.What is ?

For any sampled population,the population of all sample means is approximately normally distributed.

If a sample size is at least _____,then for any sampled population,we can conclude that the sample means are approximately normal.

The number of defectives in the samples of 100 observations each is the following: 1,2,1,0,2,3,1,4,2,1.What is the estimate of the population proportion of defectives?

If the sampled population is exactly normal distribution,then the sampling distribution of is also expected to be normal regardless of the sample size.

As the sample size increases,the standard deviation of the sampling distribution increases.

The reason sample variance has a divisor of n-1 rather than n is that it makes the variance an unbiased estimate of the population variance.

We can randomly select a sample from an infinite population of potential process measurements by sampling the process at different and equally spaced time points.

As the sample size ___________,the standard deviation of the population of all sample proportions increases.

Find

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression

Model Building and Model Diagnostics

Time Series Forecasting

Process Improvement Using Control Charts

Nonparametric Methods

Decision Theory

Filters

Exam 7: Sampling and Sampling Distributions

If a population is known to be normally distributed,then it follows that the sample standard deviation must equal σ\sigmaσ .

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5.The sampling distribution of ____________________.

A random sample of size 1,000 is taken from a population where p = .20.What is ?

For any sampled population,the population of all sample means is approximately normally distributed.

If a sample size is at least _____,then for any sampled population,we can conclude that the sample means are approximately normal.

The number of defectives in the samples of 100 observations each is the following: 1,2,1,0,2,3,1,4,2,1.What is the estimate of the population proportion of defectives?

If the sampled population is exactly normal distribution,then the sampling distribution of is also expected to be normal regardless of the sample size.

As the sample size increases,the standard deviation of the sampling distribution increases.

The reason sample variance has a divisor of n-1 rather than n is that it makes the variance an unbiased estimate of the population variance.

We can randomly select a sample from an infinite population of potential process measurements by sampling the process at different and equally spaced time points.

As the sample size ___________,the standard deviation of the population of all sample proportions increases.

Find

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression

Model Building and Model Diagnostics

Time Series Forecasting

Process Improvement Using Control Charts

Nonparametric Methods

Decision Theory

Filters

If a population is known to be normally distributed,then it follows that the sample standard deviation must equal $\sigma$ .