Exam 8: Estimating Single Population Parameters

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The procurement manager for a large company wishes to estimate the proportion of parts from a supplier that are defective.She has selected a random sample of n = 200 incoming parts and has found 11 to be defective.Based on a 95 percent confidence level,the upper and lower limits for the confidence interval estimate are approximately 0.0234 to 0.0866.

(True/False)

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Question 141

If a pilot sample of n = 40 items has been used as a first step in determining a required sample size of n = 360,the decision maker can go ahead and use these 40 and take a sample of only 320 more items.

(True/False)

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Question 142

The U.S.Post Office is interested in estimating the mean weight of packages shipped using the overnight service.They plan to sample 300 packages.A pilot sample taken last year showed that the standard deviation in weight was about 0.15 pounds.If they are interested in an estimate that has 95 percent confidence,what margin of error can they expect?

(Multiple Choice)

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Question 143

If we are interested in estimating the population mean based on a sample from a population for which we know neither the mean nor the standard deviation,the critical value will be a t value from the t-distribution.

(True/False)

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Question 144

A random sample of 100 people was selected from a population of customers at a local bank.The mean age of these customers was 40.If the population standard deviation is thought to be 5 years,the margin of error for a 95 percent confidence interval estimate is .98 years.

(True/False)

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Question 145

Showing 141 - 145 of 145

If a pilot sample of n = 40 items has been used as a first step in determining a required sample size of n = 360,the decision maker can go ahead and use these 40 and take a sample of only 320 more items.

If we are interested in estimating the population mean based on a sample from a population for which we know neither the mean nor the standard deviation,the critical value will be a t value from the t-distribution.

A random sample of 100 people was selected from a population of customers at a local bank.The mean age of these customers was 40.If the population standard deviation is thought to be 5 years,the margin of error for a 95 percent confidence interval estimate is .98 years.

The Where, why, and How of Data Collection

Graphs,charts and Tablesdescribing Your Data

Describing Data Using Numerical Measures

Using Probability and Probability Distributions

Discrete Probability Distributions

Introduction to Continuous Probability Distributions

Introduction to Sampling Distributions

Introduction to Hypothesis Testing

Estimation and Hypothesis Testing for Two Population Parameters

Hypothesis Tests and Estimation for Population Variances

Analysis of Variance

Goodness-Of-Fit Tests and Contingency Analysis

Introduction to Linear Regression and Correlation Analysis

Multiple Regression Analysis and Model Building

Analyzing and Forecasting Time-Series Data

Introduction to Nonparametric Statistics

Introduction to Quality and Statistical Process Control

Introduction to Decision Analysis

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