Question 1

In hypothesis testing if the null hypothesis is rejected,

Accepted Answer

A) no conclusions can be drawn from the test 
B) the alternative hypothesis is true 
C) the data must have been accumulated incorrectly 
D) the sample size has been too small 
A) no conclusions can be drawn from the test 
B) the alternative hypothesis is true 
C) the data must have been accumulated incorrectly 
D) the sample size has been too small

Question 2

A tire manufacturer has been producing tires with an average life expectancy of 26,000 miles.Now the company is advertising that its new tires' life expectancy has increased.In order to test the legitimacy of the advertising campaign,an independent testing agency tested a sample of 6 of their tires and has provided the following data.
   
a.Determine the mean and the standard deviation.
b.At 99% confidence using the critical value approach,test to determine whether or not the tire company is using legitimate advertising.Assume the population is normally distributed.
c.Repeat the test using the p-value approach.

Accepted Answer

a.= 27,s = 1.67 b.H_o: @#LAT-DLM& < 260

Question 3

For a one-tailed test (upper tail),a sample size of 26 at 90% confidence,t =

Accepted Answer

A) 1.316 
B) -1.316 
C) -1.740 
D) 1.740 
A) 1.316 
B) -1.316 
C) -1.740 
D) 1.740

Question 4

The sum of the values of $\alpha$ and $\beta$

Accepted Answer

A) always add up to 1.0 
B) always add up to 0.5 
C) is the probability of Type II error 
D) None of these alternatives is correct. 
A) always add up to 1.0 
B) always add up to 0.5 
C) is the probability of Type II error 
D) None of these alternatives is correct.

Question 5

A group of young businesswomen wish to open a high fashion boutique in a vacant store but only if the average income of households in the area is at least $25,000.A random sample of 9 households showed the following results.
   
Assume the population of incomes is normally distributed. 
a.Compute the sample mean and the standard deviation.
b.State the hypotheses for this problem.
c.Compute the test statistic.
d.At 95% confidence using the p-value approach,what is your conclusion?

Accepted Answer

a.@#LAT-DLM&= 25,000 s = 1,936.49
b.H<su

Question 6

The p-value

Accepted Answer

A) is the same as the Z statistic 
B) measures the number of standard deviations from the mean 
C) is a distance 
D) is a probability 
A) is the same as the Z statistic 
B) measures the number of standard deviations from the mean 
C) is a distance 
D) is a probability

Question 7

Exhibit 9-6
A random sample of 16 students selected from the student body of a large university had an average age of 25 years and a standard deviation of 2 years.We want to determine if the average age of all the students at the university is significantly more than 24.Assume the distribution of the population of ages is normal.
-Refer to Exhibit 9-6.At 95% confidence,it can be concluded that the mean age is

Accepted Answer

A) not significantly different from 24 
B) significantly different from 24 
C) significantly less than 24 
D) significantly more than 24 
A) not significantly different from 24 
B) significantly different from 24 
C) significantly less than 24 
D) significantly more than 24

Question 8

An official of a large national union claims that the fraction of women in the union is not significantly different from one-half.Using the critical value approach and the sample information reported below,carry out a test of this statement.Let $\alpha$ = 0.05.

Accepted Answer

H₀: P = 0

Question 9

Exhibit 9-1
  
-Refer to Exhibit 9-1.The test statistic is

Accepted Answer

A) 2.3 
B) 0.38 
C) -2.3 
D) -0.38 
A) 2.3 
B) 0.38 
C) -2.3 
D) -0.38

Question 10

If a hypothesis is rejected at the 5% level of significance,it

Accepted Answer

A) will always be rejected at the 1% level 
B) will always be accepted at the 1% level 
C) will never be tested at the 1% level 
D) may be rejected or not rejected at the 1% level 
A) will always be rejected at the 1% level 
B) will always be accepted at the 1% level 
C) will never be tested at the 1% level 
D) may be rejected or not rejected at the 1% level

Question 11

The p-value is a probability that measures the support (or lack of support)for the

Accepted Answer

A) null hypothesis 
B) alternative hypothesis 
C) either the null or the alternative hypothesis 
D) sample statistic 
A) null hypothesis 
B) alternative hypothesis 
C) either the null or the alternative hypothesis 
D) sample statistic

Question 12

For a one-tailed test (lower tail)with 22 degrees of freedom at 95% confidence,the value of t =

Accepted Answer

A) -1.383 
B) 1.383 
C) -1.717 
D) -1.721 
A) -1.383 
B) 1.383 
C) -1.717 
D) -1.721

Question 13

The level of significance

Accepted Answer

A) can be any positive value 
B) can be any value 
C) is (1 - confidence level) 
D) can be any value between -1.96 to 1.96 
A) can be any positive value 
B) can be any value 
C) is (1 - confidence level) 
D) can be any value between -1.96 to 1.96

In hypothesis testing if the null hypothesis is rejected,

For a one-tailed test (upper tail),a sample size of 26 at 90% confidence,t =

The sum of the values of $\alpha$ and $\beta$

The p-value

Exhibit 9-1 -Refer to Exhibit 9-1.The test statistic is

If a hypothesis is rejected at the 5% level of significance,it

The p-value is a probability that measures the support (or lack of support)for the

For a one-tailed test (lower tail)with 22 degrees of freedom at 95% confidence,the value of t =

The level of significance

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

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

Exam 9: Hypothesis Tests

In hypothesis testing if the null hypothesis is rejected,

For a one-tailed test (upper tail),a sample size of 26 at 90% confidence,t =

The sum of the values of α\alphaα and β\betaβ

The p-value

An official of a large national union claims that the fraction of women in the union is not significantly different from one-half.Using the critical value approach and the sample information reported below,carry out a test of this statement.Let α\alphaα = 0.05.

Exhibit 9-1 -Refer to Exhibit 9-1.The test statistic is

If a hypothesis is rejected at the 5% level of significance,it

The p-value is a probability that measures the support (or lack of support)for the

For a one-tailed test (lower tail)with 22 degrees of freedom at 95% confidence,the value of t =

The level of significance

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

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

The sum of the values of $\alpha$ and $\beta$