Question 1

When is the finite population correction used?

Accepted Answer

A)  When the population is more than or equal to 20 times the sample size. 
B)  When the population is less than or equal to 20 times the population size. 
C)  When the population is equal to 20 times the population size. 
D)  Whenever the sample size is small,no matter what the population size is. 
A)  When the population is more than or equal to 20 times the sample size. 
B)  When the population is less than or equal to 20 times the population size. 
C)  When the population is equal to 20 times the population size. 
D)  Whenever the sample size is small,no matter what the population size is. B

Question 2

If the sampled population is nonnormal,the t-test of the population mean $\mu$ is still valid,provided that the condition is not extreme.

Accepted Answer

A) True 
 B)False  True

Question 3

A professor of statistics refutes the claim that the proportion of Republican voters in Michigan is at most 44%.To test the claim,the hypotheses: H0: p = 0.44,H1: p $\neq$ 0.44,should be used.

Accepted Answer

A) True 
 B)False  False

Question 4

____________________ 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 5

The air pumps at service stations come equipped with a gauge to regulate the air pressure of tires.A mechanic believes that the gauges are in error by at least 3 pounds per square inch.To test his belief he takes a random example of 50 air pump gauges and determines the difference between the true pressure (as measured by an accurate measuring device)and the pressure shown on the air pump gauge.The mean and the standard deviation of the sample are $\bar { x }$ = 3.4 and s = 1.2.Can the mechanic infer that he is correct at the 5% significance level? Assume tire pressures have a normal distribution.

Accepted Answer

H₀: @#LAT-DLM& = 3,H₁: @#LAT-DLM& > 3

Question 6

Two uses for the population variance are to measure risk and consistency.

Accepted Answer

A) True 
 B)False

Question 7

When determining the sample size needed for a proportion for a given level of confidence and sampling error,the closer to 0.50 that p is estimated to be:

Accepted Answer

A)  the smaller the sample size required. 
B)  the larger the sample size required. 
C)  the sample size is not affected. 
D)  the effect cannot be determined from the information given. 
A)  the smaller the sample size required. 
B)  the larger the sample size required. 
C)  the sample size is not affected. 
D)  the effect cannot be determined from the information given.

Question 8

When a population is small relative to the sample size,we must incorporate the ____________________ factor in the calculation of the standard error of estimate of the mean.

Accepted Answer

finite pop

Question 9

If we are testing for an improvement in the consistency of an operation or the manufacturing of a product,the alternative hypothesis would have a(n)____________________ sign in it.

Accepted Answer

The answer of If we are testing for an improvement...

Question 10

The ____________________ confidence limit of the confidence interval estimator of the population variance is $\frac { ( n - 1 ) s ^ { 2 } } { \chi _ { \alpha / 2 } ^ { 2 } }$ .

Accepted Answer

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

Question 11

Physicians
A random sample of 200 physicians shows that there are 36 of them who make at least $400,000 a year.
-{Physicians Narrative} Can we conclude at the 1% significance level that the true proportion of physicians in the population who make at least $400,000 a year is less than 0.24?

Accepted Answer

H₀: p = 0.24,H₁: p

Question 12

Hourly Fees
A random sample of 15 hourly fees for car washers (including tips)was drawn from a normal population.The sample mean and sample standard deviation were $\bar { x }$ = $14.9 and s = $6.75.
-{Hourly Fees Narrative} Can we infer at the 5% significance level that the mean fee for car washers (including tips)is greater than 12?

Accepted Answer

H₀: @#LAT-DLM& = 12,H₁: @#LAT-DLM&> 12

Question 13

When the population standard deviation is ____________________ and the population is normal,the test statistic for testing hypotheses about $\mu$ is the t-distribution with n - 1 degrees of freedom.

Accepted Answer

The answer of When the population standard deviation is ____________________...

Question 14

Mass marketing refers to the mass production and marketing by a company of all products the company produces for a single segment of the entire market.

Accepted Answer

A) True 
 B)False

Question 15

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 16

Mystic Pizza
Mystic Pizza in Mystic,Connecticut,advertises that they deliver your pizza within 15 minutes of placing an order or it is free.A sample of 25 customers is selected at random.The average delivery time in the sample was 13 minutes with a sample standard deviation of 4 minutes.
-{Mystic Pizza Narrative} We want to know whether Mystic can make this claim or not.Test to determine if we can infer at the 5% significance level that the population mean delivery time is less than 15 minutes.

Accepted Answer

H₀: @#LAT-DLM& = 15,H₁: @#LAT-DLM& < 1

Question 17

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} Does this data provide sufficient evidence at the 10% significance level to indicate that the manager is correct?

Accepted Answer

H₀:@#LAT-DLM& = 2,H₁: @#LAT-DLM& < 2 R

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

The test statistic for p is approximately normal when np and n(1 - p)are both ____________________.

Accepted Answer

The answer of The test statistic for p is approximately...

Question 20

In estimating the total of a population of size N,where N is very large compared to the sample size,the confidence interval estimator of the total is $N \left[ \bar { x } \pm t _ { \alpha / 2 } \cdot s / \sqrt { n } \right]$ .

Accepted Answer

A) True 
 B)False

Exam 12: Inference About a Population

When is the finite population correction used?

If the sampled population is nonnormal,the t-test of the population mean μ\muμ is still valid,provided that the condition is not extreme.

A professor of statistics refutes the claim that the proportion of Republican voters in Michigan is at most 44%.To test the claim,the hypotheses: H0: p = 0.44,H1: p ≠\neq= 0.44,should be used.

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

Two uses for the population variance are to measure risk and consistency.

When determining the sample size needed for a proportion for a given level of confidence and sampling error,the closer to 0.50 that p is estimated to be:

When a population is small relative to the sample size,we must incorporate the ____________________ factor in the calculation of the standard error of estimate of the mean.

If we are testing for an improvement in the consistency of an operation or the manufacturing of a product,the alternative hypothesis would have a(n)____________________ sign in it.

The ____________________ confidence limit of the confidence interval estimator of the population variance is (n−1)s2χα/22\frac { ( n - 1 ) s ^ { 2 } } { \chi _ { \alpha / 2 } ^ { 2 } }χα/22​(n−1)s2​ .

Physicians A random sample of 200 physicians shows that there are 36 of them who make at least $400,000 a year. -{Physicians Narrative} Can we conclude at the 1% significance level that the true proportion of physicians in the population who make at least $400,000 a year is less than 0.24?

When the population standard deviation is ____________________ and the population is normal,the test statistic for testing hypotheses about μ\muμ is the t-distribution with n - 1 degrees of freedom.

Mass marketing refers to the mass production and marketing by a company of all products the company produces for a single segment of the entire market.

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

The test statistic for p is approximately normal when np and n(1 - p)are both ____________________.

In estimating the total of a population of size N,where N is very large compared to the sample size,the confidence interval estimator of the total is N[xˉ±tα/2⋅s/n]N \left[ \bar { x } \pm t _ { \alpha / 2 } \cdot s / \sqrt { n } \right]N[xˉ±tα/2​⋅s/n​] .

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

A: Numerical Descriptive Techniques

B: Numerical Descriptive Techniques

C: Numerical Descriptive Techniques

Data Collection and Sampling

Probability

A: Random Variables and Discrete Probability Distributions

B: 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

A: Simple Linear Regression and Correlation

B: Simple Linear Regression and Correlation

Multiple Regression

Model Building

Nonparametric Statistics

Time-Series Analysis and Forecasting

Statistical Process Control

Decision Analysis

Conclusion

Filters

If the sampled population is nonnormal,the t-test of the population mean $\mu$ is still valid,provided that the condition is not extreme.

A professor of statistics refutes the claim that the proportion of Republican voters in Michigan is at most 44%.To test the claim,the hypotheses: H₀: p = 0.44,H₁: p $\neq$ 0.44,should be used.

The ____________________ confidence limit of the confidence interval estimator of the population variance is $\frac { ( n - 1 ) s ^ { 2 } } { \chi _ { \alpha / 2 } ^ { 2 } }$ .

When the population standard deviation is ____________________ and the population is normal,the test statistic for testing hypotheses about $\mu$ is the t-distribution with n - 1 degrees of freedom.

In estimating the total of a population of size N,where N is very large compared to the sample size,the confidence interval estimator of the total is $N \left[ \bar { x } \pm t _ { \alpha / 2 } \cdot s / \sqrt { n } \right]$ .