Question 1

The confidence interval estimate of the population proportion is constructed around the sample proportion.

Accepted Answer

A) True 
 B)False

Question 2

A university dean is interested in determining the proportion of students who receive some sort of financial aid.Rather than examine the records of all students,the dean randomly selects 200 students and finds that 118 of them are receiving financial aid.The 95% confidence interval for π is 0.59 ± 0.07.Interpret this interval.

Accepted Answer

A)  We are 95% confident that 59% of the students are on some sort of financial aid. 
B)  We are 95% confident that the true proportion of all students receiving financial aid is between 0.52 and 0.66. 
C)  95% of the students get between 52% and 66% of their tuition paid for by financial aid. 
D)  We are 95% confident that between 52% and 66% of the sampled students receive some sort of financial aid. 
A)  We are 95% confident that 59% of the students are on some sort of financial aid. 
B)  We are 95% confident that the true proportion of all students receiving financial aid is between 0.52 and 0.66. 
C)  95% of the students get between 52% and 66% of their tuition paid for by financial aid. 
D)  We are 95% confident that between 52% and 66% of the sampled students receive some sort of financial aid.

Question 3

A race car driver tested his car for time from 0 to 100 km/h,and in 20 tests obtained an average of 4.85 seconds with a standard deviation of 1.47 seconds.A 95% confidence interval for the 0 to 100 time is 4.52 seconds to 5.18 seconds.

Accepted Answer

A) True 
 B)False

Question 4

Instruction 8-5
The actual voltages of power packs labelled as 12 volts are as follows: 11.77, 11.90, 11.64, 11.84, 12.13, 11.99, and 11.77.
-Referring to Instruction 8-5,it is possible that the 99% confidence interval calculated from the data will not contain the mean voltage for the sample.

Accepted Answer

A) True 
 B)False

Question 5

Instruction 8-16
The Registrar of a university would like to estimate the proportion of the student population who owns a personal computer. In a sample of 500 students, 417 own a personal computer.
-Referring to Instruction 8-16,a 95% confidence interval for the proportion of student population who own a personal computer is narrower than a 99% confidence interval.

Accepted Answer

A) True 
 B)False

Question 6

Instruction 8-10
The actual voltages of power packs labelled as 12 volts are as follows: 11.77, 11.90, 11.64, 11.84, 12.13, 11.99, and 11.77.
-Referring to Instruction 8-10,a 99% confidence interval for the mean voltage of the power packs is from ____________ to _____.

Accepted Answer

The answer of Instruction 8-10
The actual voltages of power packs...

The confidence interval estimate of the population proportion is constructed around the sample proportion.

A race car driver tested his car for time from 0 to 100 km/h,and in 20 tests obtained an average of 4.85 seconds with a standard deviation of 1.47 seconds.A 95% confidence interval for the 0 to 100 time is 4.52 seconds to 5.18 seconds.

Instruction 8-5 The actual voltages of power packs labelled as 12 volts are as follows: 11.77, 11.90, 11.64, 11.84, 12.13, 11.99, and 11.77. -Referring to Instruction 8-5,it is possible that the 99% confidence interval calculated from the data will not contain the mean voltage for the sample.

Instruction 8-10 The actual voltages of power packs labelled as 12 volts are as follows: 11.77, 11.90, 11.64, 11.84, 12.13, 11.99, and 11.77. -Referring to Instruction 8-10,a 99% confidence interval for the mean voltage of the power packs is from ________ to _.

Defining and Collecting Data

Organising and Visualising Data

Numerical Descriptive Measures

Basic Probability

Some Important Discrete Probability Distributions

The Normal Distribution and Other Continuous Distributions

Sampling Distributions

Fundamentals of Hypothesis Testing: One-Sample Tests

Hypothesis Testing: Two-Sample Tests

Analysis of Variance

Simple Linear Regression

Introduction to Multiple Regression

Time-Series Forecasting and Index Numbers

Chi-Square Tests

Multiple Regression Model Building

Decision Making

Statistical Applications in Quality Management

Further Non-Parametric Tests

Filters

Exam 8: Confidence Interval Estimation

The confidence interval estimate of the population proportion is constructed around the sample proportion.

A race car driver tested his car for time from 0 to 100 km/h,and in 20 tests obtained an average of 4.85 seconds with a standard deviation of 1.47 seconds.A 95% confidence interval for the 0 to 100 time is 4.52 seconds to 5.18 seconds.

Instruction 8-5 The actual voltages of power packs labelled as 12 volts are as follows: 11.77, 11.90, 11.64, 11.84, 12.13, 11.99, and 11.77. -Referring to Instruction 8-5,it is possible that the 99% confidence interval calculated from the data will not contain the mean voltage for the sample.

Instruction 8-10 The actual voltages of power packs labelled as 12 volts are as follows: 11.77, 11.90, 11.64, 11.84, 12.13, 11.99, and 11.77. -Referring to Instruction 8-10,a 99% confidence interval for the mean voltage of the power packs is from ____________ to _____.

Defining and Collecting Data

Organising and Visualising Data

Numerical Descriptive Measures

Basic Probability

Some Important Discrete Probability Distributions

The Normal Distribution and Other Continuous Distributions

Sampling Distributions

Fundamentals of Hypothesis Testing: One-Sample Tests

Hypothesis Testing: Two-Sample Tests

Analysis of Variance

Simple Linear Regression

Introduction to Multiple Regression

Time-Series Forecasting and Index Numbers

Chi-Square Tests

Multiple Regression Model Building

Decision Making

Statistical Applications in Quality Management

Further Non-Parametric Tests

Filters

Instruction 8-10 The actual voltages of power packs labelled as 12 volts are as follows: 11.77, 11.90, 11.64, 11.84, 12.13, 11.99, and 11.77. -Referring to Instruction 8-10,a 99% confidence interval for the mean voltage of the power packs is from ________ to _.