please i need help with a sample quiz that i am confused about

There is still a lot of concern about cell phone safety. The National Toxicology Program studied animals exposed to radiation levels equal to and higher than those currently allowed for cell phones. The researchers divided the rodents into two groups. One group was exposed to low levels of radiation, and the other was exposed to high levels. After two years, each animal was carefully examined for tumors. The data will be used to determine whether cell phone radiation is harmful. Identify whether this is an observational study or an experiment and dene the variable of interest. 0 This is an observational study. The variable of interest is the tumor count for each rodent. O This is an experiment. The variable of interest is the radiation level. 0 This is an observational study. The variable of interest is cell phone safety. 0 This is an experiment. The variable of interest is the tumor count for each rodent. Transport Canada would like to test the re extinguishers in certain Gulf Stream Coach RVs. Some evidence indicates that these devices may become clogged or require excessive force to operate. Each selected re extinguisher will be carefully tested, and the data will then be used to determine whether a product recall should be issued. Select a method for obtaining a simple random sample of re extinguishers in these vehicles. 0 Obtain a list of the serial numbers of the re extinguishers in Transport Canada's Gulf Stream Coach RVs. Include the rst n serial numbers to the list of re extinguishers that will be tested and inspected by the company. 0 Go to the nearest parking for RVs and nd n vehicles of this particular model to be tested and inspected by the company. 0 Obtain a list of the serial numbers of the re extinguishers in Transport Canada's Gulf Stream Coach RVs. Using a random number generator, produce a list of :1 unique serial numbers to be tested and inspected by the company. 0 Obtain a list of the serial numbers of the re extinguishers in Transport Canada's Gulf Stream Coach RVs. Divide the obtained list into subgroups depending on the vehicle's year of manufacturing. Select from each subset a serial numbers to produce a general list to be tested and inspected by the company. Is this an observational study or an experimental study? The stud is both observational and ex erimental. Y P O The study is observational. O The study is experimental. m The studv is neither observational nor exneri mental. Each of the following is either a descriptive statistics or an inferential statistics problem. Identify all of those that are a descriptive statistics problem. I: The Society of Government Economists conducted a salary and working conditions survey of top technology executives in the United States. A report issued by this group included a table that listed the number of bank executives in each state with salaries exceeding $1 million. I: The International Olympic Committee presented a medal table for the Pyeongchang 2018 Winter Olympics. The tab]: listed the number of gold, silver, and bronze medals won by each country. I: The Flowers Canada Growers obtained a sample of people who sent roses for Valentine's Day and recorded the color of the roses purchased. This information was used to construct a table listing the proportion of each color of rose purchased on Valentine's Day. I: American Express conducted a survey of travelers at Los Angeles International Airport. The information was used to estimate the proportion of all travelers who make a purchase in an airport duty-free shop. I: The Intergovernmental Panel of Climate Change collected data associated with global warming and predicted the extinction of up to 30% of plant and animal species in the world. Each of the following is either a descriptive statistics or an inferential statistics problem. Identify all of those that are a descriptive statistics problem. I:I A report by NASA listed each weather satellite orbiting the Earth and the number of years each has been in service. I:I The US. Patent Ofce issued a report listing every company that was granted a patent in 2018 and the number of patents awarded to each company. I:I The Agricultural Research Service obtained samples of natural cocoa from a variety of sources and measured the total antioxidant capacity in each sample. The resulting data were used to suggest that eating a moderate amount of chocolate may help prevent cancer, heart disease, and stroke. I:I Researchers from King's College in London compared the effects of e-cigarettes versus smoking. Scientists studied long-term users of both types of cigarettes and concluded that e-cigarettes are not as harmful as smoking. [I A researcher at Emory University used brain scans to conclude that zen meditation may help treat disorders characterized by distracting thoughts. A Parents Association would like to determine the proportion of teenagers who have the ability to prepare an entire meal. A sample of teenagers was obtained and each teen was asked if they could cook. Describe the population of interest, the sample, and the variable of interest in this problem. The population is The sample is v The variable of interest is