Chapter 9 Inferences from Two Samples
9-2 Inferences About Two Proportions 1. There are two requirements for using the methods of this section, and each of them is violated. (1) The samples should be two sample random samples that are independent. These s
Chapter 8 Hypothesis Testing
8-2 Basics of Hypothesis Testing 1. Given the large sample size and the fact that 20% is so much less than 50%, it is apparent that any confidence interval for the proportion of bosses that are good communicators would fall en
Chapter 7 Estimates and Sample Sizes
7-2 Estimating a Population Proportion 1. The confidence level was not stated. The most common level of confidence is 95%, and sometimes that level is carelessly assumed without actually being stated. 2. The margin of
Chapter 6 Normal Probability Distributions
6-2 The Standard Normal Distribution 1. The word normal as used when referring to a normal distribution does carry with it some of the meaning the word has in ordinary language. Normal distributions occur in natu
Chapter 4 Probability
4-2 Basic Concepts of Probability 1. To say that the probability of being injured while using recreation equipment in 1/500 means that approximately one injury occurs for every 500 times that recreation equipment is used. Note that t
Chapter 3 Statistics for Describing, Exploring, and Comparing Data
3-2 Measures of Center 1. The mean, median, mode, and midrange are measures of center in the sense that they each attempt to determine (by various criteria i.e., by using different approac
Chapter 2 Summarizing and Graphing Data
2-2 Frequency Distributions 1. No. The first class frequency, for example, tells us only that there were 18 pennies with weights in the 2.40-2.49 grams class, but there is no way to tell the exact values of those 18
Chapter 1 Introduction to Statistics
1-2 Statistical Thinking 1. A voluntary response sample, also called a self-selected selected, is one in which the subjects themselves decide whether or not to participate in the study. 2. A voluntary response sample i