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Business Statistics
At the 5% significance level, is there a difference in the mean jump heights among the teams?Four basketball teams took a random sample of players regarding how high each player can jump (in inches).
What is the df(num)?A video game developer is testing a new game on three different groups. Each group represents a different target market for the game. The developer collects scores from a random
What is the df(denom)?A video game developer is testing a new game on three different groups. Each group represents a different target market for the game. The developer collects scores from a random
What are the SSbetween and MSbetween?A video game developer is testing a new game on three different groups. Each group represents a different target market for the game. The developer collects
What are the SSwithin and MSwithin?A video game developer is testing a new game on three different groups. Each group represents a different target market for the game. The developer collects scores
What is the F Statistic?A video game developer is testing a new game on three different groups. Each group represents a different target market for the game. The developer collects scores from a
What is the p-value?A video game developer is testing a new game on three different groups. Each group represents a different target market for the game. The developer collects scores from a random
At the 10% significance level, are the scores among the different groups different?A video game developer is testing a new game on three different groups. Each group represents a different target
Suppose a group is interested in determining whether teenagers obtain their drivers licenses at approximately the same average age across the country. Suppose that the following data are randomly
Suppose a group is interested in determining whether teenagers obtain their drivers licenses at approximately the same average age across the country. Suppose that the following data are randomly
Suppose a group is interested in determining whether teenagers obtain their drivers licenses at approximately the same average age across the country. Suppose that the following data are randomly
Three students, Linda, Tuan, and Javier, are given five laboratory rats each for a nutritional experiment. Each rat’s weight is recorded in grams. Linda feeds her rats Formula A, Tuan feeds his
A grassroots group opposed to a proposed increase in the gas tax claimed that the increase would hurt working-class people the most, since they commute the farthest to work. Suppose that the group
Which two magazine types do you think have the same variance in length?The following table lists the number of pages in four different types of magazines. home decorating news health computer 172 87
Which two magazine types do you think have different variances in length?The following table lists the number of pages in four different types of magazines. home decorating news health computer 172
Is the variance for the amount of money, in dollars, that shoppers spend on Saturdays at the mall the same as the variance for the amount of money that shoppers spend on Sundays at the mall? Suppose
Are the variances for incomes on the East Coast and the West Coast the same? Suppose that Table 12.22 shows the results of a study. Income is shown in thousands of dollars. Assume that both
Thirty men in college were taught a method of finger tapping. They were randomly assigned to three groups of ten, with each receiving one of three doses of caffeine: 0 mg, 100 mg, 200 mg. This is
King Manuel I, Komnenus ruled the Byzantine Empire from Constantinople (Istanbul) during the years 1145 to 1180 A.D. The empire was very powerful during his reign, but declined significantly
The American League and the National League of Major League Baseball are each divided into three divisions: East, Central, and West. Many years, fans talk about some divisions being stronger (having
Three different traffic routes are tested for mean driving time. The entries in the Table 12.29 are the driving times in minutes on the three different routes.State SSbetween, SSwithin, and the F
Suppose a group is interested in determining whether teenagers obtain their drivers licenses at approximately the same average age across the country. Suppose that the following data are randomly
Suppose a group is interested in determining whether teenagers obtain their drivers licenses at approximately the same average age across the country. Suppose that the following data are randomly
Suppose a group is interested in determining whether teenagers obtain their drivers licenses at approximately the same average age across the country. Suppose that the following data are randomly
Suppose a group is interested in determining whether teenagers obtain their drivers licenses at approximately the same average age across the country. Suppose that the following data are randomly
Three students, Linda, Tuan, and Javier, are given five laboratory rats each for a nutritional experiment. Each rat's weight is recorded in grams. Linda feeds her rats Formula A, Tuan feeds his rats
A grassroots group opposed to a proposed increase in the gas tax claimed that the increase would hurt working-class people the most, since they commute the farthest to work. Suppose that the group
Using a significance level of 5%, test the hypothesis that the four magazine types have the same mean length.Table 12.34 lists the number of pages in four different types of magazines. home
Eliminate one magazine type that you now feel has a mean length different from the others. Redo the hypothesis test, testing that the remaining three means are statistically the same. Use a new
A researcher wants to know if the mean times (in minutes) that people watch their favorite news station are the same.Suppose that Table 12.35 shows the results of a study.Assume that all
Are the means for the final exams the same for all statistics class delivery types? Table 12.36 shows the scores on final exams from several randomly selected classes that used the different delivery
Are the mean number of times a month a person eats out the same for whites, blacks, Hispanics and Asians? Suppose that Table 12.37 shows the results of a study.Assume that all distributions are
Are the mean numbers of daily visitors to a ski resort the same for the three types of snow conditions? Suppose that Table 12.38 shows the results of a study.Assume that all distributions are normal,
If the number of degrees of freedom for a chi-square distribution is 25, what is the population mean and standard deviation?
If df > 90, the distribution is _____________. If df = 15, the distribution is ________________.
When does the chi-square curve approximate a normal distribution?
Where is μ located on a chi-square curve?
Is it more likely the df is 90, 20, or two in the graph? x
What type of test should be used?An archer’s standard deviation for his hits is six (data is measured in distance from the center of the target). An observer claims the standard deviation is less.
State the null and alternative hypotheses.An archer’s standard deviation for his hits is six (data is measured in distance from the center of the target). An observer claims the standard deviation
Is this a right-tailed, left-tailed, or two-tailed test?An archer’s standard deviation for his hits is six (data is measured in distance from the center of the target). An observer claims the
What type of test should be used?The standard deviation of heights for students in a school is 0.81. A random sample of 50 students is taken, and the standard deviation of heights of the sample is
State the null and alternative hypotheses.The standard deviation of heights for students in a school is 0.81. A random sample of 50 students is taken, and the standard deviation of heights of the
The standard deviation of heights for students in a school is 0.81. A random sample of 50 students is taken, and the standard deviation of heights of the sample is 0.96. A researcher in charge of the
What type of test should be used?The average waiting time in a doctor’s office varies. The standard deviation of waiting times in a doctor’s office is 3.4 minutes. A random sample of 30 patients
What is the test statistic?The average waiting time in a doctor’s office varies. The standard deviation of waiting times in a doctor’s office is 3.4 minutes. A random sample of 30 patients in the
What can you conclude at the 5% significance level?The average waiting time in a doctor’s office varies. The standard deviation of waiting times in a doctor’s office is 3.4 minutes. A random
An archeologist is calculating the distribution of the frequency of the number of artifacts she finds in a dig site. Based on previous digs, the archeologist creates an expected distribution broken
An economist is deriving a model to predict outcomes on the stock market. He creates a list of expected points on the stock market index for the next two weeks. At the close of each day’s trading,
A personal trainer is putting together a weight-lifting program for her clients. For a 90-day program, she expects each client to lift a specific maximum weight each week. As she goes along, she
A teacher predicts that the distribution of grades on the final exam will be and they are recorded in Table 11.21.d f = ______ Grade Proportion A 0.25 B 0.30 C 0.35 D 0.10 Table 11.21 The actual
State the null and alternative hypotheses.A teacher predicts that the distribution of grades on the final exam will be and they are recorded in Table 11.21. Grade Proportion A 0.25 B 0.30 C 0.35 D
A teacher predicts that the distribution of grades on the final exam will be and they are recorded in Table 11.21.χ2 test statistic = ______ Grade Proportion A 0.25 B 0.30 C 0.35 D 0.10 Table 11.21
At the 5% significance level, what can you conclude?A teacher predicts that the distribution of grades on the final exam will be and they are recorded in Table 11.21. Grade Proportion A 0.25 B 0.30 C
If the ethnicities of AIDS victims followed the ethnicities of the total county population, fill in the expected number of cases per ethnic group.Perform a goodness-of-fit test to determine whether
The following data are real. The cumulative number of AIDS cases reported for Santa Clara County is broken down by ethnicity as in Table 11.23.H0: _______ Ethnicity White Hispanic Number of Cases
The following data are real. The cumulative number of AIDS cases reported for Santa Clara County is broken down by ethnicity as in Table 11.23.Ha: _______ Ethnicity White Hispanic Number of Cases
Is this a right-tailed, left-tailed, or two-tailed test?The following data are real. The cumulative number of AIDS cases reported for Santa Clara County is broken down by ethnicity as in Table 11.23.
The following data are real. The cumulative number of AIDS cases reported for Santa Clara County is broken down by ethnicity as in Table 11.23.degrees of freedom = _______ Ethnicity White Hispanic
The following data are real. The cumulative number of AIDS cases reported for Santa Clara County is broken down by ethnicity as in Table 11.23.χ2 test statistic = _______ Ethnicity White Hispanic
Graph the situation. Label and scale the horizontal axis. Mark the mean and test statistic. Shade in the region corresponding to the confidence level.Let α = 0.05 Decision: ________________ Reason
Does it appear that the pattern of AIDS cases in Santa Clara County corresponds to the distribution of ethnic groups in this county? Why or why not?The following data are real. The cumulative number
A pharmaceutical company is interested in the relationship between age and presentation of symptoms for a common viral infection. A random sample is taken of 500 people with the infection across
The owner of a baseball team is interested in the relationship between player salaries and team winning percentage. He takes a random sample of 100 players from different organizations.
A marathon runner is interested in the relationship between the brand of shoes runners wear and their run times. She takes a random sample of 50 runners and records their run times as well as the
Transit Railroads is interested in the relationship between travel distance and the ticket class purchased. A random sample of 200 passengers is taken. Table 11.25 shows the results.The railroad
Transit Railroads is interested in the relationship between travel distance and the ticket class purchased. A random sample of 200 passengers is taken. Table 11.25 shows the results.The railroad
How many passengers are expected to travel between 201 and 300 miles and purchase second-class tickets?Transit Railroads is interested in the relationship between travel distance and the ticket class
How many passengers are expected to travel between 401 and 500 miles and purchase first-class tickets?Transit Railroads is interested in the relationship between travel distance and the ticket class
What is the test statistic?Transit Railroads is interested in the relationship between travel distance and the ticket class purchased. A random sample of 200 passengers is taken. Table 11.25 shows
What can you conclude at the 5% level of significance?Transit Railroads is interested in the relationship between travel distance and the ticket class purchased. A random sample of 200 passengers is
α = 0.01a. Decision: ___________________b. Reason for the decision: ___________________c. Conclusion (write out in a complete sentence): ___________________
A math teacher wants to see if two of her classes have the same distribution of test scores. What test should she use?
What are the null and alternative hypotheses for Exercise 11.48?Exercise 11.48A math teacher wants to see if two of her classes have the same distribution of test scores. What test should she use?
A market researcher wants to see if two different stores have the same distribution of sales throughout the year. What type of test should he use?
A meteorologist wants to know if East andWest Australia have the same distribution of storms. What type of test should she use?
What condition must be met to use the test for homogeneity?
State the null and alternative hypotheses.Do private practice doctors and hospital doctors have the same distribution of working hours? Suppose that a sample of 100 private practice doctors and 150
Do private practice doctors and hospital doctors have the same distribution of working hours? Suppose that a sample of 100 private practice doctors and 150 hospital doctors are selected at random and
What is the test statistic?Do private practice doctors and hospital doctors have the same distribution of working hours? Suppose that a sample of 100 private practice doctors and 150 hospital doctors
What can you conclude at the 5% significance level?Do private practice doctors and hospital doctors have the same distribution of working hours? Suppose that a sample of 100 private practice doctors
Which test do you use to decide whether an observed distribution is the same as an expected distribution?Do private practice doctors and hospital doctors have the same distribution of working hours?
What is the null hypothesis for the type of test from Exercise 11.57?Exercise 11.57Which test do you use to decide whether an observed distribution is the same as an expected distribution?Do private
Which test would you use to decide whether two factors have a relationship?
Which test would you use to decide if two populations have the same distribution?
How are tests of independence similar to tests for homogeneity?
How are tests of independence different from tests for homogeneity?
As the number of degrees of freedom increases, the graph of the chi-square distribution looks more and more symmetrical.
The standard deviation of the chi-square distribution is twice the mean.
The mean and the median of the chi-square distribution are the same if df = 24.
Is the traveler disputing the claim about the average or about the variance?Suppose an airline claims that its flights are consistently on time with an average delay of at most 15 minutes. It claims
A sample standard deviation of 15 minutes is the same as a sample variance of __________ minutes.Suppose an airline claims that its flights are consistently on time with an average delay of at most
Is this a right-tailed, left-tailed, or two-tailed test?Suppose an airline claims that its flights are consistently on time with an average delay of at most 15 minutes. It claims that the average
Suppose an airline claims that its flights are consistently on time with an average delay of at most 15 minutes. It claims that the average delay is so consistent that the variance is no more than
Suppose an airline claims that its flights are consistently on time with an average delay of at most 15 minutes. It claims that the average delay is so consistent that the variance is no more than
Suppose an airline claims that its flights are consistently on time with an average delay of at most 15 minutes. It claims that the average delay is so consistent that the variance is no more than
Graph the situation. Label and scale the horizontal axis. Mark the mean and test statistic. Shade the area associated with the level of confidence.Suppose an airline claims that its flights are
Suppose an airline claims that its flights are consistently on time with an average delay of at most 15 minutes. It claims that the average delay is so consistent that the variance is no more than
How did you know to test the variance instead of the mean?Suppose an airline claims that its flights are consistently on time with an average delay of at most 15 minutes. It claims that the average
If an additional test were done on the claim of the average delay, which distribution would you use?Suppose an airline claims that its flights are consistently on time with an average delay of at
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