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- Question : 1CQQ - Chicago Bulls The numbers of the current players for the Chicago Bulls basketball team are 1, 2, 3, 5, 6, 9, 11, 13, 16, 20, 22, 26, 32, and 40. Does it make sense to calculate the average (mean) of these numbers?
- Question : 2CQQ - Chicago Bulls Which of the following best describes the level of measurement of the data listed in Exercise 1: nominal, ordinal, interval, ratio?
- Question : 3CQQ - Earthquake Depths Data Set 16 includes depths (km) of the sources of earthquakes. Are these values discrete or continuous?
- Question : 4CQQ - Earthquake Depths Are the earthquake depths described in Exercise 3 quantitative data or categorical data?
- Question : 5CQQ - Earthquake Depths Which of the following best describes the level of measurement of the earthquake depths described in Exercise 3: nominal, ordinal, interval, ratio?
- Question : 6CQQ - Earthquake Depths True or false: If you construct a sample by selecting every sixth earthquake depth from the list given in Data Set 16, the result is a simple random sample.
- Question : 7CQQ - Gallup Poll In a recent Gallup poll, pollsters randomly selected adults and asked them whether they smoke. Because the subjects agreed to respond, is the sample a voluntary response sample?
- Question : 8CQQ - Parameter and Statistic In a recent Gallup poll, pollsters randomly selected adults and asked them whether they smoke. Among the adults who responded to the survey question, 21% said that they did smoke. Is that value of 21% an example of a statistic or an example of a parameter?
- Question : 9CQQ - Observational Study or Experiment Are the data described in Exercise 8 the result of an observational study or an experiment?
- Question : 10CQQ - Statistical Significance and Practical Significance True or false: If data lead to a conclusion with statistical significance, then the results also have practical significance.
- Question : 1RE - Walmart Stores Currently, there are 4227 Walmart stores in the United States and another 3210 stores outside of the United States. a. Are the numbers of Walmart stores discrete or continuous? b. What is the level of measurement for the numbers of Walmart stores in different years? (nominal, ordinal, interval, ratio) c. If a survey is conducted by randomly selecting 10 customers in every Walmart store, what type of sampling is used? (random, systematic, convenience, stratified, cluster) d. If a survey is conducted by randomly selecting 20 Walmart stores and interviewing all of the employees at the selected stores, what type of sampling is used? (random, systematic, convenience, stratified, cluster) e. What is wrong with surveying customer satisfaction by mailing questionnaires to 10,000 randomly selected customers?
- Question : 2RE - What's Wrong? A survey sponsored by the American Laser Centers included responses from 575 adults, and 24% of the respondents said that the face is their favorite body part (based on data from USA Today). What is wrong with this survey?
- Question : 3RE - What's Wrong? A survey included 4230 responses from Internet users who decided to respond to a question posted by America OnLine (AOL). Here is the question: How often do you use credit cards for purchases? Among the respondents, 67% said that they used credit cards frequently. What is wrong with this survey?
- Question : 4RE - Sampling Seventy
- Question : 5RE - Percentages a. The labels on U
- Question : 6RE - Why the Discrepancy? A Gallup poll was taken two years before a presidential election, and it showed that Hillary Clinton was preferred by about 50% more voters than Barack Obama. The subjects in the Gallup poll were randomly selected and surveyed by telephone. An America OnLine (AOL) poll was conducted at the same time as the Gallup poll, and it showed that Barack Obama was preferred by about twice as many respondents as Hillary Clinton. In the AOL poll, Internet users responded to voting choices that were posted on the AOL site. How can the large discrepancy between the two polls be explained? Which poll is more likely to reflect the true opinions of American voters at the time of the poll?
- Question : 7RE - Statistical Significance and Practical Significance The Gengene Research Group has developed a procedure designed to increase the likelihood that a baby will be born a girl. In a clinical trial of their procedure, 112 girls were born to 200 different couples. If the method has no effect, there is about a 4% chance that such extreme results would occur. Does the procedure appear to have statistical significance? Does the procedure appear to have practical significance?
- Question : 8RE - . Marijuana Survey In a recent Pew poll of 1500 adults, 52% of the respondents said that the use of marijuana should not be made legal. In the same poll, 23% of the respondents said that the use of marijuana for medical purposes should not be legal. a. The sample of 1500 adults was selected from the population of all adults in the United States. The method used to select the sample was equivalent to placing the names of all adults in a giant bowl, mixing the names, and then drawing 1500 names. What type of sampling is this? (random, systematic, convenience, stratified, cluster) b. If the sampling method consisted of a random selection of 30 adults from each of the 50 states, what type of sampling would this be? (random, systematic, convenience, stratified, cluster) c. What is the level of measurement of the responses of yes, no, don't know, and refused to respond? d. Is the given value of 52% a statistic or a parameter? Why? e. What would be wrong with conducting the survey by mailing a questionnaire that respondents could complete and mail back?
- Question : 9RE - Marijuana Survey Identify the type of sampling (random, systematic, convenience, stratified, cluster) used when a sample of the 1500 survey responses is obtained as described. Then determine whether the sampling scheme is likely to result in a sample that is representative of the population of all adults. a. A complete list of all 241,472,385 adults in the United States is compiled and every 150,000th name is selected until the sample size of 1500 is reached. b. A complete list of all 241,472,385 adults in the United States is compiled and 1500 adults are randomly selected from that list. c. The United States is partitioned into regions with 100 adults in each region. Then 15 of those regions are randomly selected, and all 100 people in each of those regions are surveyed. d. The United States is partitioned into 150 regions with approximately the same number of adults in each region, then 10 people are randomly selected from each of the 150 regions. e. A survey is mailed to 10,000 randomly selected adults, and the 1500 responses are used.
- Question : 10RE - . Marijuana Survey Exercise 8 referred to a Pew poll of 1500 adults, and 52% of the respondents said that the use of marijuana should not be made legal. a. Among the 1500 adults who responded, what is the number of respondents who said that the use of marijuana should not be made legal? b. In the same poll of 1500 adults, 345 of the respondents said that the use of marijuana for medical purposes should not be legal. What is the percentage of respondents who said that the use of marijuana for medical purposes should not be legal? c. In this survey of 1500 adults, 727 are men and 773 are women. Find the percentage of respondents who are men, and then find the percentage of respondents who are women.d. Does the difference between the two percentages from part (c) appear to have statistical significance? e. Does the difference between the two percentages from part (c) appear to have practical significance?
- Question : 1CRE - Flights Refer to the flight numbers listed in the first column of Data Set 15 in Appendix B. What value is obtained when those 48 numbers are added and the total is then divided by 48? (This result, called the mean, is discussed in Chapter 3.) Does the result have any meaning?
- Question : 2CRE - IQ Scores Refer to the IQ scores listed in Data Set 6 in Appendix B. What value is obtained when those 20 IQ scores are added and the total is then divided by 20? (This result, called the mean, is discussed in Chapter 3.) Is the result reasonably close to 100, which is the mean IQ score for the population?
- Question : 3CRE - Height of Tallest Man Sultan Kosen is the tallest man, and the expression below converts his height of 247 cm to a standardized score. Find this value and round the result to two decimal places. Such standardized scores are considered to be unusually high if they are greater than 2 or 3. Is the result unusually high?
- Question : 4CRE - Transportation Safety The given expression is used for determining the likelihood that a water taxi will have a total passenger weight that exceeds the maximum safe weight of 3500 lb. Find the given value and round the result to two decimal places
- Question : 5CRE - Determining Sample Size The given expression is used to determine the size of the sample necessary to estimate the proportion of college students who have the profound wisdom to take a statistics course. Find the value and round the result to the nearest whole number.
- Question : 6CRE - Testing the Effectiveness of Echinacea The given expression is part of a calculation used to study the effectiveness of Echinacea in treating colds. Round the result to four decimal places.
- Question : 7CRE - Variation in Body Temperatures The given expression is used to compute a measure of the variation (variance) of three IQ scores.
- Question : 8CRE - Standard Deviation The given expression is used to compute what is calledthe standard deviation of three IQ scores. (The standard deviation is introduced in Section 3
- Question : 9CRE
- Question : 10CRE
- Question : 11CRE
- Question : 12CRE
- Question : 1TP - Simple Random Sample In this project, we will use technology and randomness to identify a simple random sample. Let's assume that we want to conduct a survey of people randomly selected from a population. Instead of using a very large population, we will refer to Data Set 12 in Appendix B for the list of 38 names of the presidents of the United States. (That list does not include presidents who took office as the result of a resignation or assassination.) We will use a process that results in a simple random sample of five of those names. The basic idea is to consider the list of 38 names to be numbered from 1 through 38. We will use technology to randomly generate five numbers between 1 and 38, and then we will identify the five names corresponding to those five random numbers.
- Question : 1FDD
- Question : 2FDD

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