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A medical team wants to determine which form of mastectomy is most effective for prolonging life for women with breast cancer: radical mastectomy (removal of breast, chest muscles, and lymph nodes), simple mastectomy (removal of the breast only), or "lump-ectomy" + chemotherapy (removal of only the cancerous lump, leaving the breast tissue otherwise intact). The team examines the records from five large hospitals and compares the survival times after surgery of all women who have had these various types of surgery for breast cancer.Flag this QuestionQuestion 4 1 pts Was this studyWas this studya randomized controlled design experimentan observational studya surveyNone of the aboveFlag this QuestionQuestion 5 1 pts What was the explanatory (treatment) variable?What was the explanatory (treatment) variable?HospitalSurvival timeForm of mastectomyWomanFlag this QuestionQuestion 6 1 pts What was the response variable?What was the response variable?HospitalSurvival timeForm of mastectomyWomanFlag this QuestionQuestion 7 1 pts What was the experimental unit?What was the experimental unit?HospitalSurvival timeForm of mastectomyWomanFlag this QuestionQuestion 8 1 pts Skip to question text.A public health research wants to determine the average blood lead concentration for children in elementary school (grades K through 5), but has reason to believe the concentration may differ among neighborhoods where predominantly lower, middle, and upper socio-economic class populations live.Select the most appropriate sampling or experimental study design for the above situation.Natural experiment (observational study)Stratified samplingSystematic samplingCluster samplingFlag this QuestionQuestion 9 1 pts Skip to question text.A health and nutrition researcher wants to determine if people who are on a calorie-restriction diet and do an hour of aerobic exercise three days per week lose more weight than people who just restrict caloric intake, people who just exercise, and people who do neither.Select the most appropriate sampling or experimental study design for the above situation.Natural experiment (observational study)Stratified samplingSystematic samplingCluster samplingFlag this QuestionQuestion 10 1 pts Skip to question text.A student in a wildlife biology class wants to determine the abundance of a rodent species in a local nature preserve, divided into smaller blocks. She is concerned that she only has a modest number of traps and time to do the project, and wants to select the most appropriate sampling or experimental study design. Which one of the following is most appropriate for this study?Natural experiment (observational study)Stratified samplingSystematic samplingCluster sampling
The State Transportation Department is interested in estimating the proportion of vehicle owners that are operating vehicles without the required liability insurance.
The study was done to distinguish people's religion with how many days that they have said they have been calm in past three days. Determine proportion of Catholics were calm for 1 out of 3 days?
Use these statistics to construct a 94% confidence interval for the mean monthly consumption for the population of all Ontario households.
Probability the second truck is available is .50, and the probability that both trucks are available is .30. What is the probability neither truck is available?
Regarding four scales referring to levels of measurement: Nominal, Ordinal, Interval and Ratio. Please pick one and discuss one level of measurement, and briefly describe how you would use that type of measurement in a study.
These plot yields followed approximately a normal distribution with mean 88 lb and SD 7 lb. Find the probability that any one randomly selected plot yield is greater than 90 lb.
Critically illustrate out the aim and obejectives of factor analysis? Critically illustrate out the aim and obejectives of Cluster analysis? Critically illustrate out the aim and obejectives of Multidimensional analysis?
Tom Smith wants to test the hypothesis that adult men have a mean weight that is greater than 150 pounds. Tom surveys the adult male members of his family and obtains 40 sample values
Vote in favor of ABC in the elections. Derive a 95 % confi dence interval for the mean proportion of voters in Sile who will vote for ABC in the coming elections.
A random sample of 13 four-cylinder cars is obtained and the breaking distances are measured and found to have a mean of 137.5 ft and a standard deviation of 5.8 ft.
A random sample of 100 items is selected from a population of size 350. What is the probability that the sample mean will exceed 200 if the population means is 195 and the population standard deviation equals 20?
At the .01 significance level, is there a difference in the mean number of times men and Women order take-out dinners in a month? What is the p -value?
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