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statistics
elementary statistics a step by step approach

Elementary Statistics A Step By Step Approach 9th Edition Allan G. Bluman - Solutions

What is the meaning of the adjusted R2 ? Why is it computed?
For Exercises perform the following steps.a. Draw the scatter plot for the variables.b. Compute the value of the correlation coefficient.c. State the hypotheses.d. Test the significance of the correlation coefficient at α = 0.05, using Table I.e. Give a brief explanation of the type of
If all the points fall on a straight line, the value of r will be______ or______ .
What is meant by the explained variation? How is it computed?
From the Data Bank, choose two variables that might be related: for example, IQ and educational level; age and cholesterol level; exercise and weight; or weight and systolic pressure. Do a complete correlation and regression analysis by performing the following steps. Select a random sample of at
Determine whether each statement is true or false. If the statement is false, explain why.A correlation coefficient of - 1 implies a perfect linear relationship between the variables.
For each team in major league baseball note the number of wins the team had last year and the number of home runs by its best home run hitter. Is the number of wins linearly related to the number of home runs hit? How much variability in total wins is explained by home runs hit? Write a regression
Before a television set leaves the factory, it is given a quality control check. The probability that a television contains 0, 1, or 2 defects is 0.88, 0.08, and 0.04, respectively. In a sample of 16 televisions, find the probability that 9 will have 0 defects, 4 will have 1 defect, and 3 will have
For Exercises perform each of the following 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 diagrams to show the critical region (or regions), and use the traditional method of hypothesis
Determine whether each statement is true or false. If the statement is false, explain why.If the same diet is given to two groups of randomly selected individuals, the samples are considered to be dependent.
Use the data collected in data project 2 of Chapter 7 regarding home runs for this problem. Test the claim that the mean number of home runs hit by the American League sluggers is the same as the mean for the National League.Data from in Project 2Use the top home run hitter from each major league
For each exercise, perform these steps. Assume that all variables are normally or approximately normally distributed.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 traditional method of
Use the data regarding BMI that were collected in data project 6 of Chapter 7 to complete this problem. Test the claim that the mean BMI for males is the same as that for females. Test the claim that the standard deviation for males is the same as that for females.Data from in Project 6Have each
Using the same data obtained in Exercise 4, test the hypothesis that the variances are equal.Data from in Exercise 4Select two samples of 20 values from the data in Data Set IV in Appendix B. Test the hypothesis that the mean heights of the buildings are equal. Data Set IV Heights (in Feet) of 80
Find each X, given p̂.a. p̂ = 0.24, n = 300b. p̂ = 0.09, n = 200c. p̂ = 88%, n = 500d. p̂ = 40%, n = 480e. p̂ = 32%, n = 700
To test the equality of two variances, you would use a (n) _______ test.a. zb. tc. Chi-squared. F
For each exercise, perform these steps. Assume that all variables are normally or approximately normally distributed.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 traditional method of
Using data from the Internet for the last Presidential election to categorize the 50 states as “red” or “blue” based on who was supported for President in that state, the Democratic or Republican candidate, test the claim that the mean incomes for red states and blue states are equal.
For Exercises perform each of the following 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 traditional method of hypothesis testing unless otherwise specified.California and New York
To test the equality of two proportions, you would use a (n) _______ test.a. zb. t c. Chi-squared. F
Use the data collected in data project 6 of Chapter 2 regarding heart rates. Test the claim that the heart rates after exercise are more variable than the heart rates before exercise.Data from in Project 6Have each person in class take his or her pulse and determine the heart rate (beats in 1
Find p̅ and q̅ .a. X1 = 6, n1 = 15, X 2= 9, n2 = 15b. X1 = 21, n1 = 100, X2 = 43, n2 = 150c. X1 = 20, n1 = 80, X2 = 65, n2 = 120d. X1 = 15, n 1= 50,X2 = 3, n2 = 12e. X1 = 24, n1 = 40,X2 = 18, n2
For Exercises perform each of the following 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 traditional method of hypothesis testing unless otherwise specified.At age 9 the average
The mean value of F is approximately equal toa. 0b. 0.5 c. 1d. It cannot be determined.
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 traditional method of hypothesis testing unless otherwise specified.A survey found that 83% of the men
What test can be used to test the difference between two sample means when the population variances are known?a. zb. t c. Chi-squared. F
For these exercises, perform each of these steps. Assume that all variables are normally or approximately normally distributed.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 traditional
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 traditional method of hypothesis testing unless otherwise specified.In a random sample of 80 Americans,44
For each exercise, perform these steps. Assume that all variables are normally or approximately normally distributed.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 traditional method of
For Exercises perform each of these steps. Assume that all variables are normally or approximately normally distributed.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 traditional method of
For these exercises, perform each of these steps. Assume that all variables are normally or approximately normally distributed.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 traditional
Determine whether each statement is true or false. If the statement is false, explain why.The values of F cannot be _______.
For Exercises perform the following steps. Assume that all variables are normally distributed.a. State the hypotheses and identify the claim.b. Find the critical value.c. Compute the test value.d. Make the decision.e. Summarize the results.Use the traditional method of hypothesis testing unless
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 traditional method of hypothesis testing unless otherwise specified.A survey found that in a random sample
For Exercises perform the following steps. Assume that all variables are normally distributed.a. State the hypotheses and identify the claim.b. Find the critical value.c. Compute the test value.d. Make the decision.e. Summarize the results.Use the traditional method of hypothesis testing unless
For each of these problems, perform the following 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 traditional method of hypothesis testing unless otherwise specified.The average income
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 traditional method of hypothesis testing unless otherwise specified.In a random sample of 200 men, 130 said
For Exercises perform the following steps. Assume that all variables are normally distributed.a. State the hypotheses and identify the claim.b. Find the critical value.c. Compute the test value.d. Make the decision.e. Summarize the results.Use the traditional method of hypothesis testing unless
Two large home improvement stores advertise that they sell their paint at the same average price per gallon. A random sample of 25 cans from store Y had a standard deviation of $5.21, and store Z had a standard deviation of $4.08 based on a random sample of 20 cans. At α=0.05, can we conclude
The formula for the F test for variances is _______.
For each of these problems, perform the following 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 traditional method of hypothesis testing unless otherwise specified.A researcher
For each of these problems, perform the following 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 traditional method of hypothesis testing unless otherwise specified.The data shown are
For these exercises, perform each of these steps. Assume that all variables are normally or approximately normally distributed.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 traditional
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 traditional method of hypothesis testing unless otherwise specified.Find the 99% confidence interval for the
For each of these problems, perform the following 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 traditional method of hypothesis testing unless otherwise specified.The average price
For each of these problems, perform the following 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 traditional method of hypothesis testing unless otherwise specified.The data shown
For each of these problems, perform the following 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 traditional method of hypothesis testing unless otherwise specified.A random sample of
For these exercises, perform each of these steps. Assume that all variables are normally or approximately normally distributed.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 traditional
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 traditional method of hypothesis testing unless otherwise specified.The percentages of on time arrivals for
For these exercises, perform each of these steps. Assume that all variables are normally or approximately normally distributed.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 traditional
A researcher claims that the variation in the salaries of elementary school teachers is greater than the variation in the salaries of secondary school teachers. A random sample of the salaries of 30 elementary school teachers has a variance of $8324, and a random sample of the salaries of 30
For each of these problems, perform the following 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 traditional method of hypothesis testing unless otherwise specified.In an effort to
For Exercises perform the following steps. Assume that all variables are normally distributed.a. State the hypotheses and identify the claim.b. Find the critical value.c. Compute the test value.d. Make the decision.e. Summarize the results.Use the traditional method of hypothesis testing unless
For each of these problems, perform the following 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 traditional method of hypothesis testing unless otherwise specified.To increase egg
For these exercises, perform each of these steps. Assume that all variables are normally or approximately normally distributed.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 traditional
For each of these problems, perform the following 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 traditional method of hypothesis testing unless otherwise specified.In a random sample
For these exercises, perform each of these steps. Assume that all variables are normally or approximately normally distributed.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 traditional
A recent survey of 200 randomly selected households showed that 8 had a single male as the head of household. Forty years ago, a survey of 200 randomly selected households showed that 6 had a single male as the head of household. At α = 0.05, can it be concluded that the proportion has changed?
If there is a significant difference between p1 and p2 and between p2 and p3, can you conclude that there is a significant difference between p1 and p3?
A researcher wants to compare the variances of the heights (in inches) of four-year college basketball players with those of players in junior colleges. A random sample of 30 players from each type of school is selected, and the variances of the heights for each type are 2.43 and 3.15,
For each of these problems, perform the following 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 traditional method of hypothesis testing unless otherwise specified.A politician
According to the almanac, the average sales price of a single-family home in the metropolitan Dallas/Ft. Worth/Irving, Texas, area is $143,800. The average home price in Orlando, Florida, is $134,700. The mean of a random sample of 45 homes in the Texas metroplex was $156,500 with a population
Compare the proportion of men who are smokers with the proportion of women who are smokers. Use the data in the Data Bank. Choose random samples of size 30 or more. Use the z test for proportions.Data from in Data Bank Data Bank 988288 ID number 01 27 18 03 32 04 24 Age 05 19 56 07
Select two samples of 20 values from the data in Data Set IV in Appendix B. Test the hypothesis that the mean heights of the buildings are equal.Data from in Data Set IV Data Set IV Heights (in Feet) of 80 Tallest Buildings in New York
The study cited in the article entitled “Only the Timid Die Young” stated that “Timid rats were 60% more likely to die at any given time than were their outgoing brothers.” Based on the results, answer the following questions.a. Why were rats used in the study?b. What are the variables in
Based on the study presented in the article entitled “Sleeping Brain, Not at Rest,” answer these questions.a. What were the variables used in the study?b. How were they measured?c. Suggest a statistical test that might have been used to arrive at the conclusion.d. Based on the results, what
Repeat the experiment in Exercise 1, using a different variable and two samples of size 15. Compare the means by using a t test.Data from in Exercise 1From the Data Bank, select a variable and compare the mean of the variable for a random sample of at least 30 men with the mean of the variable for
Determine whether each statement is true or false. If the statement is false, explain why.Tests for variances are always two-tailed.
Use the cell phone data collected for data project 2 in Chapter 8 to complete this problem. Test the claim that the mean length for outgoing calls is the same as that for incoming calls. Test the claim that the standard deviation for outgoing calls is more than that for incoming calls.Data from in
Determine whether each statement is true or false. If the statement is false, explain why.When computing the F test value, you should place the larger variance in the numerator of the fraction.
For each exercise, perform these steps. Assume that all variables are normally or approximately normally distributed.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 traditional method of
From the Data Bank, select a variable and compare the mean of the variable for a random sample of at least 30 men with the mean of the variable for the random sample of at least 30 women. Use a z test.Data from in Data Bank Data Bank ID number 01 27 2 1 18 1 0 2 0 2 1 1 1 2 1 1 3 25 2 63 0 37
For the following exercises where applicable: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 traditional method of hypothesis testing unless otherwise specified. Assume all variables are
Determine whether each statement is true or false. If the statement is false, explain why.When you are testing the difference between two means, it is not important to distinguish whether the samples are independent of each other.
Use the data collected in data project 1 of Chapter 2 to complete this problem. Test the claim that the mean earnings per share for Dow Jones stocks are greater than for NASDAQ stocks.Data from in Project 1Consider the 30 stocks listed as the Dow Jones Industrials. For each, find its earnings
For the following exercises where applicable: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 traditional method of hypothesis testing unless otherwise specified. Assume all variables are
Use the traditional method of hypothesis testing unless otherwise specified. Assume all variables are normally distributed.Find the P-value for the z test in Exercise 15.Data from in Exercise 15A sociologist wishes to see if it is true that for a certain group of professional women, the average age
For the following exercises where applicable: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 traditional method of hypothesis testing unless otherwise specified. Assume all variables are
For the following exercises where applicable: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 traditional method of hypothesis testing unless otherwise specified. Assume all variables are
For the following exercises where applicable: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 traditional method of hypothesis testing unless otherwise specified. Assume all variables are
For the following exercises where applicable: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 traditional method of hypothesis testing unless otherwise specified. Assume all variables are
Use the traditional method of hypothesis testing unless otherwise specified. Assume all variables are normally distributed.Find the P-value for the z test in Exercise 16.Data from in Exercise 16A real estate agent believes that the average closing cost of purchasing a new home is $6500 over the
For Exercises perform each of the following 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.The average farm size in the United States is 444 acres. A random sample of 40 farms in Oregon
A survey in Men’s Health magazine reported that 39% of cardiologists said that they took vitamin E supplements. To see if this is still true, a researcher randomly selected 100 cardiologists and found that 36 said that they took vitamin E supplements. At α = 0.05, test the claim that 39% of the
A magazine article stated that the average age of women who are getting married for the first time is 26 years. A researcher decided to test this hypothesis at α = 0.02. She selected a random sample of 25 women who were recently married for the first time and found the average was 25.1 years. The
Approximately 70% of the U.S. population recycles. According to a green survey of a random sample of 250 college students, 204 said that they recycled. At α = 0.01, is there sufficient evidence to conclude that the proportion of college students who recycle is greater than 70%?For Exercises
A taxi company claims that its drivers have an average of at least 12.4 years’ experience. In a study of 15 randomly selected taxi drivers, the average experience was 11.2 years. The standard deviation was 2. At α = 0.10, is the number of years’ experience of the taxi drivers really less than
For the following exercises where applicable: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 traditional method of hypothesis testing unless otherwise specified. Assume all variables are
A conjecture about a population parameter is called a(n) _______.
For Exercises perform each of the following 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.A motorist claims that the South Boro Police issue an average of 60 speeding tickets per day. These
Suppose a statistician chose to test a hypothesis at α = 0.01. The critical value for a right-tailed test is +2.33. If the test value were 1.97, what would the decision be? What would happen if, after seeing the test value, she decided to choose α = 0.05? What would the decision be? Explain the
A magazine claims that 75% of all teenage boys have their own radios. A researcher wished to test the claim and selected a random sample of 60 teenage boys. She found that 54 had their own radios. At α = 0.01, should the claim be rejected?For the following exercises where applicable:a. State the
For Exercises perform each of the following 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.A store manager hypothesizes that the average number of pages a person copies on the store’s copy
A Harris Poll found that 35% of people said that they drink a caffeinated beverage to combat midday drowsiness. A recent survey found that 19 out of 48 randomly selected people stated that they drank a caffeinated beverage to combat midday drowsiness. At α = 0.02, is the claim of the percentage
For the following exercises where applicable: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 traditional method of hypothesis testing unless otherwise specified. Assume all variables are
For Exercises perform each of the following 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.A researcher claims that the yearly consumption of soft drinks per person is 52 gallons. In a sample
For the following exercises where applicable: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 traditional method of hypothesis testing unless otherwise specified. Assume all variables are
For Exercises perform each of the following 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.The average length of prison term in the United States for white collar crime is 34.9 months. A
For the following exercises where applicable: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 traditional method of hypothesis testing unless otherwise specified. Assume all variables are
For the following exercises where applicable: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 traditional method of hypothesis testing unless otherwise specified. Assume all variables are

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