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statistics
elementary statistics a step by step approach

Questions and Answers of Elementary Statistics A Step By Step Approach

Zillow.com is an online database that provides real estate information for U.S. homes that are for rent or sale. It also presents statistics on recently sold homes. The following table gives various
Data from a sample of Americans yielded the following estimates of average TV viewing time per month for all Americans 2 years old and older. The times are in hours and minutes; Q1 stands for first
Define the following terms:a. Observational studyb. Designed experiment
Define the following terms:a. Populationb. Sample
Objects such as asteroids and comets that come into proximity with the Earth are called near-Earth objects (NEOs). The National Aeronautics and Space Administration (NASA) tracks and catalogs all
In each of the Exercises, the quantitative data set under consideration has roughly a bell-shaped distribution. For each exercise,a. Construct a graph similar to Fig. 3.8.b. Apply Property 1 of the
In each of the Exercises, the quantitative data set under consideration has roughly a bell-shaped distribution. For each exercise,a. Construct a graph similar to Fig. 3.8.b. Apply Property 1 of the
Regarding the interquartile range,a. What type of descriptive measure is it?b. What does it measure?
In each of Exercise,a. Use the technology of your choice to obtain boxplots for the data sets, using the same scale.b. Compare the data sets by using your results from part (a), paying special
In each Exercise,a. Use the technology of your choice to obtain boxplots for the data sets, using the same scale.b. Compare the data sets by using your results from part (a), paying special attention
Fill in the following blanks.a. A standardized variable always has mean _________and standard deviation________.b. The z-score corresponding to an observed value of a variable tells you________.c. A
Identify each quantity as a parameter or a statistic.a. μ b. sc. x̄d. σ
From the Data Bank, choose a variable. Select a random sample of 20 individuals, and find the mean of the data.Data from in Data Bank Data Bank 688988&ID
Name the four basic sampling techniques.
Exercises include questions that contain a flaw. Identify the flaw and rewrite the question, following the guidelines presented in this section.Which artificial sweetener do you prefer?
Use the table in the Review ExercisesSelect a systematic sample of 12 people, and compute the mean of their blood pressures. Compare this with the population mean.Data from in Review Exercise Table
Use the table in the Review ExercisesDivide the individuals into subgroups of six males and six females. Find the means of their blood pressures. Compare these means with the population mean.Data
Use the table in the Review ExercisesSelect a cluster sample of 12 people, and find the mean of their blood pressures. Compare this with the population mean.Data from in Review Exercise Table 2005
For Exercises explain how each experiment can be simulated by using random numbers.Almost 16% of Texas residents are foreign-born. Explain how to select a sample of 40 based on this scenario.
Which method of sampling might be good for this set of data? Choose one to select 10 states and calculate the sample mean. Compare with the population mean. Record Highest Temperatures by State
For Exercises explain how to simulate each experiment by using random numbers.An airline overbooks 15% of the time.
For Exercises explain how each could be simulated by using random numbers.A travel agency has a 5% cancellation rate.
For the following exercises, use the traditional method of hypothesis testing unless otherwise specified.Three different groups of monkeys were fed three different medications for one month to see if
For the following exercises, use the traditional method of hypothesis testing unless otherwise specified.Is there a relationship between the amount of money (in millions of dollars) spent on the Head
When n ≥ 30 formula used to find the critical values for the rank correlation coefficient. For example, if n = 40 and α = 0.05 for a two-tailed test,Hence, any rs greater than or equal to +
When n ≥ 30 formula used to find the critical values for the rank correlation coefficient. For example, if n = 40 and α = 0.05 for a two-tailed test,Hence, any rs greater than or equal to +
When n ≥ 30 formula used to find the critical values for the rank correlation coefficient. For example, if n = 40 and α = 0.05 for a two-tailed test,Hence, any rs greater than or equal to +
When n ≥ 30 formula used to find the critical values for the rank correlation coefficient. For example, if n = 40 and α = 0.05 for a two-tailed test,Hence, any rs greater than or equal to +
The 2005 Atlantic hurricane season was notable for many reasons, among them the most named storms and the most hurricanes.Select a random sample of eight storms by using random numbers, and find the
The 2005 Atlantic hurricane season was notable for many reasons, among them the most named storms and the most hurricanes.Select a systematic sample of eight storms and calculate the average maximum
Exercises include questions that contain a flaw. Identify the flaw and rewrite the question, following the guidelines presented in this section.Which type of artificial sweetener do you think is the
Define simulation techniques.
Using the rules given in Figure 14–4, play the simulated bowling game. Each game consists of 10 frames.Data from in Figure 14-4 79 26 18 19 14 29 01 55 84 62 66 48 94 00 46 77 81 40 41 52 13 82 57
Select a systematic sample of 20 individuals, and using the same variable as in Exercise 1, find the mean.Data from in Data Bank Data Bank 28 ID number Age 27 2 1 1 0 2 0 2 05 19 1 06 56 1 07 65
Determine whether each statement is true or false. If the statement is false, explain why.When researchers are sampling from large populations, such as adult citizens living in the United States,
Explain why two different opinion polls might yield different results on a survey. Also, give an example of an opinion poll and explain how the data may have been collected.
A car salesperson has six automobiles on the car lot. Roll a die, using the numbers 1 through 6 to represent each car. If only one car can be sold on each day, how long will it take him to sell all
Why are samples used in statistics?
Exercises include questions that contain a flaw. Identify the flaw and rewrite the question, following the guidelines presented in this section.Do you like the mayor?
Give three examples of simulation techniques.
The 2005 Atlantic hurricane season was notable for many reasons, among them the most named storms and the most hurricanes.Select a cluster of 10 storms. Compute the sample means wind speeds. Compare
Select a cluster sample of 20 individuals, and using the same variable as in Exercise 1, find the mean.Data from in Exercise 1From the Data Bank, choose a variable. Select a random sample of 20
The 2005 Atlantic hurricane season was notable for many reasons, among them the most named storms and the most hurricanes.Divide the 28 storms into 4 subgroups. Then select a sample of three storms
Determine whether each statement is true or false. If the statement is false, explain why.Simulation techniques using random numbers are a substitute for performing the actual statistical experiment.
Use a computer to generate random numbers to simulate the following real-life problem. In a certain geographic region, 40% of the people have type O blood. On a certain day, the blood center needs 4
What is the basic requirement for a sample?
Stratify the data according to marital status and gender, and sample 20 individuals. Compute the mean of the sample variable selected in Exercise 1 (use four groups of five individuals).Data from in
Exercises include questions that contain a flaw. Identify the flaw and rewrite the question, following the guidelines presented in this section.Do you approve of the mayor’s political agenda?
Who is responsible for the development of modern simulation techniques?
In Exercises 2–3, Exercise 2 shows the numbers of signers of the Declaration of Independence from each state. A student decides to write a paper on two of the signers, who are selected at random.
Determine whether each statement is true or false. If the statement is false, explain why.When researchers perform simulation experiments, they do not need to use random numbers since they can make
In a carton of 12 iPods, three are defective. If four are sold on Saturday, find the probability that at least one will be defective. Use random numbers to simulate this exercise 50 times.
Exercises include questions that contain a flaw. Identify the flaw and rewrite the question, following the guidelines presented in this section.Do you approve of the mayor’s position on the new
Simulate the classical birthday problem given in the Critical Thinking Challenge 3 in Chapter 4. Select a sample size of 25 and generate random numbers between 1 and 365. Are there any two random
Determine whether each statement is true or false. If the statement is false, explain why.Random samples are said to be unbiased.
Of people who go on a special diet, 25% will lose at least 10 pounds in 10 weeks. A drug manufacturer says that if people take its special herbal pill, that will increase the number of people who
Exercises include questions that contain a flaw. Identify the flaw and rewrite the question, following the guidelines presented in this section.How long have you studied for this examination?
Compare all four means and decide which one is most appropriate.
When all subjects under study are used, the group is called a ________.a. Populationb. Large group c. Sampled. Study group
When a population is divided into subgroups with similar characteristics and then a sample is obtained, this method is called ________ sampling.a. Randomb. Systematic c. Stratifiedd. Cluster
Exercises include questions that contain a flaw. Identify the flaw and rewrite the question, following the guidelines presented in this section.If a plane were to crash on the border of New York and
Interviewing selected people at a local supermarket can be considered an example of ________ sampling.a. Randomb. Systematic c. Convenienced. Stratified
In general, when you conduct sampling, the ________ the sample, the more representative it will be.
For Exercises explain what is wrong with each question. Rewrite each one, following the guidelines in this chapter.How often do you run red lights?
Use the table in the Review ExercisesSelect a random sample of 12 people, and find the mean of the blood pressures of the individuals. Compare this with the population mean.Data from in Review
When samples are not representative, they are said to be ________.
When all residents of a street are interviewed for a survey, the sampling method used is_______ .
For Exercises explain what is wrong with each question. Rewrite each one, following the guidelines in this chapter.Do you think all automobiles should have heavy-duty bumpers, even though it will
For Exercises explain how each experiment can be simulated by using random numbers.Two players match pennies.
For Exercises explain what is wrong with each question. Rewrite each one, following the guidelines in this chapter.When answering questions in a survey, do you prefer open-ended questions or
For Exercises explain how each experiment can be simulated by using random numbers.Three players play odd man out. (Three coins are tossed; if all three match, the game is repeated and no one wins.
For Exercises explain how to simulate each experiment by using random numbers.A baseball player strikes out 40% of the time.
Choose a different method to select 10 states and compute the sample mean high temperature. Compare with your answer in Exercise 15 and with the population mean. Do you see any features of this data
Divide the 50 states into five subgroups by geographic location, using a map of the United States. Each subgroup should include 10 states. The subgroups should be northeast, southeast, central,
For Exercises explain how each could be simulated by using random numbers.A chess player wins 45% of his games.
For Exercises explain how to simulate each experiment by using random numbers.Two players play rock, paper, scissors. The rules are as follows: Since paper covers rock, paper wins. Since rock breaks
For Exercises explain how each could be simulated by using random numbers.Two players select a card from a deck with no face cards. The player who gets the higher card wins.
For Exercises use random numbers to simulate the experiments. The number in parentheses is the number of times the experiment should be repeated.In Exercise 17, find the average number of plays it
For Exercises explain how each could be simulated by using random numbers.One player rolls two dice. The other player selects a card from a deck. Face cards count as 11 for a jack,12 for a queen, and
For Exercises explain how each could be simulated by using random numbers.Two players toss two coins. If they match, player 1 wins; otherwise, player 2 wins.
For Exercises use random numbers to simulate the experiments. The number in parentheses is the number of times the experiment should be repeated.A field goal kicker is successful in 60% of his kicks
For Exercises use random numbers to simulate the experiments. The number in parentheses is the number of times the experiment should be done.A telephone solicitor finds that there is a 15%
For Exercises use random numbers to simulate the experiments. The number in parentheses is the number of times the experiment should be done.A field goal kicker is successful in 65% of his kicks
For Exercises use random numbers to simulate the experiments. The number in parentheses is the number of times the experiment should be done.Two coins are tossed. Find the average number of times two
For Exercises use random numbers to simulate the experiments. The number in parentheses is the number of times the experiment should be done.A single card is drawn from a deck. Find the average
For Exercises use random numbers to simulate the experiments. The number in parentheses is the number of times the experiment should be done.A bowler finds that there is a 30% probability that he
For Exercises use the traditional method of hypothesis testing unless otherwise specified. Assume the assumptions have been met.Random samples of summer gasoline prices per gallon are listed for
For Exercises use the Wilcoxon rank sum test. Assume that the samples are independent. Also perform each of these steps.a. State the hypotheses and identify the claim.b. Find the critical value(s).c.
For Exercises perform these steps.a. State the hypotheses and identify the claim.b. Find the critical value(s).c. Compute the test value.d. Make the decision.e. Summarize the results.Use the
Determine whether each statement is true or false. If the statement is false, explain why.Parametric tests are preferred over their nonparametric counterparts, if the assumptions can be met.
Have everyone in class take her or his pulse during the first minute of class. Have everyone take his or her pulse again 30 minutes into class. Conduct a paired-sample sign test to determine if there
For Exercises perform these steps.a. State the hypotheses and identify the claim.b. Find the critical value(s).c. Compute the test value.d. Make the decision.e. Summarize the results.Use the
The ________ test is used to test means when samples are dependent and the normality assumption cannot be met.a. Wilcoxon signed-rankb. Wilcoxon rank sum c. Signd. Kruskal-Wallis
For Exercises use Table K to determine whether the null hypothesis should be rejected.ws = 18, n = 15, α = 0.02, two-tailed test
Find the ranking for each state for its mean SAT Mathematics scores, its mean SAT English score, and its mean for income. Conduct a rank correlation analysis using Math and English, Math and income,
The Kruskal-Wallis test uses the ________ distribution.a. zb. t c. Chi-squared. F
For Exercises use Table K to determine whether the null hypothesis should be rejected.ws = 53, n = 20, α = 0.05, two-tailed test
Have everyone in class take his or her temperature on a healthy day. Test the claim that the median body temperature is 98.6F.
For Exercises perform these steps.a. State the hypotheses and identify the claim.b. Find the critical value(s).c. Compute the test value.d. Make the decision.e. Summarize the results.Use the
The nonparametric counterpart of ANOVA is the ________.a. Wilcoxon signed-rank testb. Sign testc. Runs testd. None of the above

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