Exam 16: Inference for Counts: Chi-Square Tests

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Consider the following to answer the question(s) below: We want to test whether type of car owned (domestic or foreign) is independent of gender. The following are the results of a random sample of 990 car owners. -To conduct the independence test the correct degrees of freedom are

(Multiple Choice)

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Question 21

Consider the following to answer the question(s) below: Vending machines on a college campus offer a variety of drinks. The purchasing agent believes that each type of drink is equally preferred by students and consequently orders equal quantities. The number of drinks sold from vending machines on this campus for the last six months is shown in the following table. -What is the mean of the χ2 distribution in this case?

(Multiple Choice)

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Question 22

Vending machines on a college campus offer a variety of drinks. The purchasing agent believes that each type of drink is equally preferred by students and consequently orders equal quantities. The number of drinks sold from vending machines on this campus for the last six months is shown in the following table. a. State appropriate hypotheses to test whether the purchasing agent is correct. b. What is the value of the test statistic and its associated P-value? c. State the conclusion at α = 0.05.

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Question 23

Consider the following to answer the question(s) below: We want to test whether type of car owned (domestic or foreign) is independent of gender. The following are the results of a random sample of 990 car owners. -At α = 0.05

(Multiple Choice)

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Question 24

An online book store wants to determine if coupon redemption is independent of gender. After a special coupon broadcast to its reward members, the following data on coupon redemption at checkout were collected. a. State appropriate hypotheses to determine whether coupon redemption is independent of gender. b. What is the value of the test statistic and its associated P-value? c. State the conclusion at α = .05.

(Essay)

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Question 25

Consider the following to answer the question(s) below: A walk-in medical clinic believes that arrivals are uniformly distributed over weekdays (Monday through Friday). It has collected the following data based on a random sample of 100 days. -How many degrees of freedom are appropriate to test that arrivals are uniformly distributed?

(Multiple Choice)

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Question 26

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Consider the following to answer the question(s) below: We want to test whether type of car owned (domestic or foreign) is independent of gender. The following are the results of a random sample of 990 car owners. -To conduct the independence test the correct degrees of freedom are

Consider the following to answer the question(s) below: We want to test whether type of car owned (domestic or foreign) is independent of gender. The following are the results of a random sample of 990 car owners. -At α = 0.05

Data

Surveys and Sampling

Displaying and Describing Categorical Data

Displaying and Describing Quantitative Data

Scatterplots, Association, and Correlation

Introduction to Linear Regression

Randomness and Probability

Random Variables and Probability Distributions

Sampling Distributions

Confidence Intervals for Proportions

Testing Hypotheses About Proportions

Confidence Intervals and Hypothesis Tests for Means

Comparing Two Means

Design of Experiments and Analysis of Variance Anova

Nonparametric Methods

Inference for Regression

Understanding Regression Residuals

Multiple Regression

Building Multiple Regression Models

Time Series Analysis

Decision Making and Risk

Quality Control

Exploring and Collecting Data

Understanding Probability Distributions and Statistical Inference

Exploring Relationships Among Variables

Using Statistics for Decision Making

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