Type of Study. Determine whether the following studies are observational studies or experiments. If the study is an experiment, identify the control and treatment groups, and discuss whether single-or double-blinding is necessary. If the study is observational, state whether it is a case-control study, and if so, identify the cases and controls.
36. A National Cancer Institute study of 716 melanoma patients and 1014 cancer-free patients matched by age, sex, and race found that those having a single large mole had twice the risk of melanoma. Having 10 or more moles was associated with a 12 times greater risk of melanoma (Journal of the American Medical Association).
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Using and Understanding Mathematics: A Quantitative Reasoning Approach (6th Edition)
- The management of a certain company would like to use the following data to learn about its customer base and to evaluate the first day promotional campaign purchases. Customers who made purchases with discount coupons were labelled as “Promotional Customers”, and “Regular Customers” was used for those who did not use coupons. Customer Type of Customer Items Net Sales (GH¢) Method of Payment Gender Marital Status Age 1 Regular 1 100 Vodacash Male Married 32 2 Promotional 1 105 MTN mobile money Female Single 36 3 Regular 1 230 Airtel money Female Married 32 4 Promotional 5 300 MTN mobile money Male Married 28 5 Regular 2 150 Vodacash Female Single 34 6 Regular 20 450 Vodacash Female Married 44 7 Promotional 2 78 MTN mobile money Male Married 30 8 Promotional 3 120 MTN mobile money Female Single 22 9 Promotional 6 345…arrow_forwardThe management of a certain company would like to use the following data to learn about its customer base and to evaluate the first day promotional campaign purchases. Customers who made purchases with discount coupons were labelled as “Promotional Customers”, and “Regular Customers” was used for those who did not use coupons. Customer Type of Customer Items Net Sales (GH¢) Method of Payment Gender Marital Status Age 1 Regular 1 100 Vodacash Male Married 32 2 Promotional 1 105 MTN mobile money Female Single 36 3 Regular 1 230 Airtel money Female Married 32 4 Promotional 5 300 MTN mobile money Male Married 28 5 Regular 2 150 Vodacash Female Single 34 6 Regular 20 450 Vodacash Female Married 44 7 Promotional 2 78 MTN mobile money Male Married 30 8 Promotional 3 120 MTN mobile money Female Single 22 9 Promotional…arrow_forwardThe Consumer Reports Restaurant Customer Satisfaction Survey is based upon 148,599 visits to full-service restaurant chains (Consumer Reports website). One of the variables in the study is meal price, the average amount paid per person for dinner and drinks, minus the tip. Suppose the reporter for the Sun Coast Times thought that it would be of interest to her readers to conduct a similar study for restaurants located on the Grand Strand section in Myrtle Beach, South Carolina. The reporter selected a sample of 8 seafood restaurants, 8 Italian restaurants, and 8 steakhouses. The following data show the meal prices ($) obtained for the 24 restaurants sampled. Use a = .05 to test whether there is a significant difference among the mean meal price for the three types of restaurants. Italian Seafood Steakhouse $12 $16 $24 13 18 19 15 17 23 17 26 25 18 23 21 20 15 22 17 19 27 24 18 31arrow_forward
- A report provided an overview of the complaints about airlines received by the Department of Transportation. The table below gives the number of complaints received by type of complaint for the years 2014 and 2015. Type of Complaint 2014 Number ofComplaints Received 2015 Number ofComplaints Received Flight Problems 4,404 5,606 Baggage Handling 1,528 2,050 Reservations, Ticketing, Boarding 1,276 1,807 Customer Service 1,101 1,728 Fares 699 1,300 Other 2,257 2,769 Use the given information to estimate the following probabilities. (Round your answers to three decimal places.) c)the probability that two complaints made in 2015 were both about flight problemsarrow_forwardA study that tells us whether two variables are associated, but does not tell us if one variable causes or influences the other, is: Question 2 options: A) a n experimental study without a control group. B) a descriptive study. C) a correlational study. D) an experimental study with one or more control groups.arrow_forwardThe Consumer Reports Restaurant Customer Satisfaction Survey is based upon 148,599 visits to full-service restaurant chains (Consumer Reports website). One of the variables in the study is meal price, the average amount paid per person for dinner and drinks, minus the tip. Suppose a reporter for the Sun Coast Times thought that it would be of interest to her readers to conduct a similar study for restaurants located on the Grand Strand section in Myrtle Beach, South Carolina. The reporter selected a sample of 8 seafood restaurants, 8 Italian restaurants, and 8 steakhouses. The following data show the meal prices ($) obtained for the 24 restaurants sampled. Use a = 0.05 to test whether there is a significant difference among the mean meal price for the three types of restaurants. Please answer the questions in the image.arrow_forward
- A researcher plans to conduct a research study comparing two treatment conditions with a total of 20 scores in each treatment. Which of the following designs would require only 20 participants? a. independent-samples design b. matched-subjects design c. between-subjects design d. within-subjects designarrow_forwardIn each of the following situation, identify the most appropriate method of data collection and give a brief explanation. A. A group of Anthropology students studies the culture and norms of two ethnic groups. B. A group of medical intern students studies the effects of laughter to patients in a mental hospital.arrow_forwardA research design that uses a separate group of participants for each condition (or for each population) is called a____. a. dependent-measures design b. between-subjects design c. repeated-measures design d. within-subjects designarrow_forward
- If we have a qualitative predictor variable with four possible categories, say, A, B, C, and D, and if x1, x2, and x3 are, respectively, the indicator variables for categories A, B, and C, give a table of the values of x1, x2, and x3 for the fourcategories A, B, C, and D.arrow_forwardDefine the following terms: a. Observational study b. Designed experimentarrow_forwardIn the Salsberry (2003) study shared in this weeks module, the researcher presents the following results of the statistical analysis: "With respect to family configuration, 20% of the children enrolled in Medicaid, 29% of the uninsured children, and 44% of the privately insured children were in families where the adults were in a “partnered relationship”, [χ2 (2,N = 392) = 21.95; P = .0001]" What type of analysis does this statement reflect?arrow_forward
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill