Exam 23: Comparing Means

Two types of flares are tested for their burning times (in minutes)and sample results are given below. Construct a 95% confidence interval for the difference - Based on the sample data.

(Multiple Choice)

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Question 41

Two machines are being considered to weigh luggage at an airport.A standard 30 kg weight is used to test the machines.Sample weigh-ins were taken from each machine and the following results were obtained. At the 0.02 level of significance,test the claim that the population mean for Machine 1 is different from the population mean for Machine 2.

(Essay)

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Question 42

A researcher was interested in comparing the salaries of female and male employees of a particular large company.Independent random samples of 8 female employees (sample 1)and 15 male employees (sample 2)yielded the following weekly salaries (in dollars).

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Question 43

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Two types of flares are tested for their burning times (in minutes)and sample results are given below. Construct a 95% confidence interval for the difference - Based on the sample data.

A researcher was interested in comparing the salaries of female and male employees of a particular large company.Independent random samples of 8 female employees (sample 1)and 15 male employees (sample 2)yielded the following weekly salaries (in dollars).

Data

Displaying and Describing Categorical Data

Displaying and Summarizing Quantitative Data

Understanding and Comparing Distributions

The Standard Deviation As a Ruler and the Normal Model

Scatterplots, association, and Correlation

Linear Regression

Regression Wisdom

Re-Expressing Data: Get It Straight

Understanding Randomness

Sample Surveys

Experiments and Observational Surveys

From Randomness to Probability

Probability Rules

Random Variables

Probability Models

Sampling Distribution Models

Confidence Intervals for Proportions

Testing Hypotheses About Proportions

More About Tests

Comparing Two Proportions

Inferences About Means

Paired Samples and Blocks

Comparing Counts

Inferences for Regression

Analysis of Variance

Multifactor Analysis of Variance

Multiple Regression

Multiple Regression Wisdom

Rank-Based Nonparametric Tests

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