A census on January 1, 1989, showed a total population of 798 animals, of which 452 were under 6 years old and 346 were 6 years and older. On January 1, 1990, there were 802 animals, of which 320 were at least 6 years old, and 482 were under 6 years of age. During the year, 376 infants were born alive, there were 25 stillbirths, and 45 of the liveborn infants died during the first 4 weeks of life. There were 107 deaths from all causes in the colony (this includes infant deaths but not foetal deaths). Of these deaths 40 were in rhesus 6 years and older: (specifically, 6 from old age, 8 from cancer, 14 from accidents and 12 from all other causes).

A census on January 1, 1989, showed a total population of 798 animals, of which 452 were under 6 years old and 346 were 6 years and older. On January 1, 1990, there were 802 animals, of which 320 were at least 6 years old, and 482 were under 6 years of age. During the year, 376 infants were born alive, there were 25 stillbirths, and 45 of the liveborn infants died during the first 4 weeks of life. There were 107 deaths from all causes in the colony (this includes infant deaths but not foetal deaths). Of these deaths 40 were in rhesus 6 years and older: (specifically, 6 from old age, 8 from cancer, 14 from accidents and 12 from all other causes).

Essentials of Business Analytics (MindTap Course List)

2nd Edition

ISBN:9781305627734

Author:Jeffrey D. Camm, James J. Cochran, Michael J. Fry, Jeffrey W. Ohlmann, David R. Anderson

Publisher:Jeffrey D. Camm, James J. Cochran, Michael J. Fry, Jeffrey W. Ohlmann, David R. Anderson

Chapter6: Statistical Inference

Section: Chapter Questions

Problem 37P: What percentage of the population live in their state of birth? According to the U.S. Census Bureaus...

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After a jail security scare, the Gallup organization surveyed 542 inmates about increased security measures at the jail. They found that 78% of these inmates were in favor of United States jails using full-body-scan imaging on inmates. Identify the sample and the population in this study. O The sample is the 542 American inmates who were surveyed and the population is all American inmates. o The sample is the 78% of inmates in favor of the full-body-scan-imaging and the population is the 542 surveyed American inmates. The sample is the 78% of inmates in favor of the full-body-scan imaging and the population is all American inmates in favor of the full-body-scan imaging. o The population is the 542 American inmates who were surveyed and the sample is all American inmates.
Reports have found that many U.S. adults would rather live in a different type of community than the one in which they are living now. A national survey of 2,260 adults asked: Where do you live now? and What do you consider to be the ideal community? Response options were City (C), Suburb (S), Small Town (T), or Rural (R). A representative portion of this survey for a sample of 100 respondents is as follows: a. Provide a percent frequency distribution and a histogram for each question. b. Where are most adults living now? c. Where do most adults consider the ideal community to be? d. What changes in living areas would you expect to see if people moved from where they currently live to their ideal community?
In an industrialized country, 20% of the adults are aged 65 and older. Furthermore, 12% of the adults have at least one symptom of heart disease, but 25% of people aged 65 and older have at least one symptom of heart disease. If an adult from this country is selected at random, what is the probability that the adult is under age 65 and has no symptoms of heart disease?
A sociologist was hired by a large city hospital to investigate the relationship between the number of unauthorized days that employees are absent per year and the distance (miles) between home and work for the employees. A sample of 10 employees was chosen, and the following data were collected. a. Develop a scatter chart for these data. Does a linear relationship appear reasonable? Explain. b. Use the data to develop an estimated regression equation that could be used to predict the number of days absent given the distance to work. What is the estimated regression model? c. What is the 99% confidence interval for the regression parameter 1? Based on this interval, what conclusion can you make about the hypotheses that the regression parameter 1 is equal to zero? d. What is the 99% confidence interval for the regression parameter 0? Based on this interval, what conclusion can you make about the hypotheses that the regression parameter 0 is equal to zero? e. How much of the variation in the sample values of number of days absent does the model you estimated in part (b) explain?
Local Hospital (LH) has decided that it would like to send nurses to a local supermarket to provide a free health screening for interested supermarket customers. The screening will consist of measuring the individual’s blood pressure and taking a drop of blood, which will be immediately tested for several critical indicators. The director of public relations at the hospital believes that 100 people will take advantage of the screening each day. The plan is to provide the screening every day for one week; thus, a total of 700 screenings are expected. LH expects the supermarket to provide a $1,000 grant to help defray the costs of the program (since it will likely draw more customers to the store). LH anticipates the following expenses: Test Equipment Rental $500 For 1 week Nurses $50/hr Total of 10 hrs/day for 7 days Blood tests $1 Per individual tested Determine the special purpose budget for the program. Show revenues and expenses by line item, and show the expected profit or loss. If…
What percentage of the population live in their state of birth? According to the U.S. Census Bureaus American Community Survey, the figure ranges from 25% in Nevada to 78.7% in Louisiana. The average percentage across all states and the District of Columbia is 57.7%. The data in the file Homestate are consistent with the findings in the American Community Survey. The data are for a random sample of 120 Arkansas residents and for a random sample of 180 Virginia residents. a. Formulate hypotheses that can be used to determine whether the percentage of stay-at-home residents in the two states differs from the overall average of 57.7%. b. Estimate the proportion of stay-at-home residents in Arkansas. Does this proportion differ significantly from the mean proportion for all states? Use = 0.05. c. Estimate the proportion of stay-at-home residents in Virginia. Does this proportion differ significantly from the mean proportion for all states? Use = 0.05. d. Would you expect the proportion of stay-at-home residents to be higher in Virginia than in Arkansas? Support your conclusion with the results obtained in parts (b) and (c).
The Saint Lucia Blood Bank, a private charity partly supported by government grants, is located on the Caribbean island of Saint Lucia. The blood bank has just finished its operations for September, which was a very busy month due to a powerful hurricane that hit neighboring islands causing many injuries. The hurricane largely bypassed Saint Lucia, but residents of Saint Lucia willingly donated their blood to help people on other islands. As a consequence, the blood bank collected and processed over 20% more blood than had been originally planned for the month. A report prepared by a government official comparing actual costs to budgeted costs for the blood bank appears below. Continued support from the government depends on the blood bank’s ability to demonstrate control over its costs. Saint Lucia Blood BankCost Control ReportFor the Month Ended September 30 Actual Results Planning Budget Variances Liters of blood collected 550 430 Medical supplies $ 10,707 $…
The St. Lucia Blood Bank, a private charity partly supported by government grants, is located on the Caribbean island of St. Lucia. The blood bank has just finished its operations for September, which was a very busy month due to a powerful hurricane that hit neighboring islands causing many injuries. The hurricane largely bypassed St. Lucia, but residents of St. Lucia willingly donated their blood to help people on other islands. As a consequence, the blood bank collected and processed over 20% more blood than had been originally planned for the month. A report prepared by a government official comparing actual costs to budgeted costs for the blood bank appears below. Continued support from the government depends on the blood bank’s ability to demonstrate control over its costs. St. Lucia Blood BankCost Control ReportFor the Month Ended September 30 Actual Results Planning Budget Variances Liters of blood collected 600 480 Medical supplies $…
The St. Lucia Blood Bank, a private charity partly supported by government grants, is located on the Caribbean island of St. Lucia. The blood bank has just finished its operations for September, which was a very busy month due to a powerful hurricane that hit neighboring islands causing many injuries. The hurricane largely bypassed St. Lucia, but residents of St. Lucia willingly donated their blood to help people on other islands. As a consequence, the blood bank collected and processed over 20% more blood than had been originally planned for the month. A report prepared by a government official comparing actual costs to budgeted costs for the blood bank appears below. Continued support from the government depends on the blood bank’s ability to demonstrate control over its costs. St. Lucia Blood BankCost Control ReportFor the Month Ended September 30 Actual Results Planning Budget Variances Liters of blood collected 620 500 Medical supplies $…
The St. Lucia Blood Bank, a private charity partly supported by government grants, is located on the Caribbean island of St. Lucia. The blood bank has just finished its operations for September, which was a very busy month due to a powerful hurricane that hit neighboring islands causing many injuries. The hurricane largely bypassed St. Lucia, but residents of St. Lucia willingly donated their blood to help people on other islands. As a consequence, the blood bank collected and processed over 20% more blood than had been originally planned for the month. A report prepared by a government official comparing actual costs to budgeted costs for the blood bank appears below. Continued support from the government depends on the blood bank’s ability to demonstrate control over its costs. St. Lucia Blood BankCost Control ReportFor the Month Ended September 30 Actual Results Planning Budget Variances Liters of blood collected 550 430 Medical supplies $…
A veterinarian keeps track of the types of animals treated by an animal clinic. The following distribution represents the percentages of animals the clinic has historically encountered. Animal type Dogs Cats Livestock Birds Other Percent 61% 22% 8% 6% 3% If the animal clinic treats 230 animals in a month, how many of each animal type would be expected? A) Animal type Dogs Cats Livestock Birds Other Expected 61 22 8 6 3 B) Animal type Dogs Cats Livestock Birds Other Expected 122 44 16 12 6 C) Animal type Dogs Cats Livestock Birds Other Expected 140 51 18 14 7 D) Animal type Dogs Cats Livestock Birds Other Expected 46 46 46 46 46 E) Animal type Dogs Cats Livestock Birds Other Expected 140.3 50.6 18.4 13.8 6.9
A study entitled "Antidepressant Medication and Breast Cancer Risk" (Amer. J. of Epi, late 1990's) stated in the methods section of the paper that "Cases were an age-stratified (< 50 and ≥ 50 years of age) random sample of women aged 25-74 years diagnosed with primary breast cancer during 1995 and 1996 (pathology report confirmed) and recorded in the population-based Ontario Cancer Registry. As the 1-year survival for breast cancer is 90%, surrogate respondents were not used. Population controls, aged 25-74 years, were randomly sampled from the property assessment rolls of the Ontario Ministry of Finance; this database includes all home owners and tenants and lists age, sex, and address." Question: Discuss the authors' approach to the identification of cases with respect to the potential for selection bias.