UPDATED 2024/2025 TEST BANK STATISTICS TEST QUESTIONS  WITH VERIFIED ANSWERS

UPDATED 2024/2025 TEST BANK STATISTICS TEST QUESTIONS  WITH VERIFIED ANSWERS A biologist wants to study the effect of vitamin D in Riched food on the weights of adult mice. What an experiment or observational study design be more appropriate? - ANSWER-An experimental study should be used for the food consumed is the control factor A candy manufacturer is interested in the distribution of colors in each of us packages of candy salt what question is appropriate for the research? - ANSWER-What is the typical distribution of colors for the packages of candies.? A climate scientist keeps track of the daily temperature, in degrees Fahrenheit, Of a lake over the course of six weeks. What is the level of measurement of the data? - ANSWER-Interval A consumer research companies interested in determining if a certain companies new refrigerator model is more efficient than the older model. Researchers decide to investigate the claim that the new model uses 10% less electricity than the older model for the same cooling load. What data collection method is appropriate? - ANSWER-The company should obtain random samples of each model, place them all in similar conditions, fill them with the same amount of water bottles, and monitor their electrical usage over the month A consumer research company is interested in determining if a certain company's new refrigerator model is more efficient than the older model. What should the researchers do first? - ANSWER-Write a claim about the efficiency of a new model that can be tested A pollster surveys voters and asks which candidates they support in the upcoming election. What is the level of measurement of the data? - ANSWER-Nominal A researcher is interested in the effects of watching videos just before bed on the quality of sleep. He has decided to test the claim " watching one hour video just before going to bed reduces the number of times of REM sleep by more than 10%" How should the number of hours of video be treated? - ANSWER-The number of hours of video should be controlled. Send measurement should be done for one hour of video and some should be done with no video A researcher is interested in the effects of watching videos just before bed on the quality of sleep. Which of the following claims would be appropriate for the situation? - ANSWER-Washing one hour video just before going to bed reduces the number of minutes of REM sleep Buy more than 10% A statistics student has obtained a sample by serving all the students in his class. What group can the results of the survey be generalized to - ANSWER-The conclusion should apply only to the sample A study was performed with a random sample of 200 people from one college. Why population would be appropriate for generalizing conclusions from the study, assuming the data collection methods used did not introduce biases? - ANSWER-The conclusions should apply to people at that particular college A study was planned to research the effects of drinking coffee on hours of sleep. What an experimental or observational study design be more appropriate? - ANSWER-An experimental study should be used for the conception of coffee is experimental factor A track runner keeps track of how long it takes her to run the 200 m dash. What is the level of measurement of the data? - ANSWER-Ratio After After asking 11 randomly selected individuals from his city whether or not they support an increase in cigarette taxes Carlos reports that 36% of the individuals from the city support an increase in cigarette taxes based on the survey. Why is this statistic misleading? - ANSWER-The sample size is insufficient An energy drink manufacturer wants to find out the effect of different amounts of their product on the maximum anaerobic power level for rowers. What an experimental or observational study design be more appropriate? - ANSWER-An experimental study should be used with the amount of the drink consumed as a control factor At a comic convention, a researcher asked attendees what their favorite comic book is. What is the level of measurement of the data? - ANSWER-Nominal Cluster sampling - ANSWER-Involves dividing the population into groups and randomly selecting several of these groups Continuous - ANSWER-Is defined as a type of quantitative data that is the result of measuring Convenience sampling - ANSWER-Is the sampling that is not random and involves using a population that is readily available Deborah conducted a survey and when she collected data on the percentage of workers with college degrees and the percentage of workers without college degrees. Which of the following should sufficiently display the data if only the two giving categories are to be included? - ANSWER-Either a pie chart or a bar graph Deborah pulled a large sample of individuals to find the percentage of people who drug more than three times a week and the percentage of people who Lift weights more than three times per week. Which of the following could sufficiently display the data of only the two given categories are to be included - ANSWER-Bar graph I candy manufacturer is interested in the distribution of colors in each of its packages of candy sold. They manufacture randomly sample packages for multiple batches at one factory. Are the results generalizable to the companies other factories that produce the same candy? - ANSWER-No, because the other factors may have different processes for the settings on the machines may be different I candy manufacturer is interested in the distribution of colors in each of us packages of candy sold. The manufacturer wants to answer the question what is the typical distribution of colors and a package of candy? Which data collection method should be used? - ANSWER-The manufacturer should randomly sample packages at the factory over multiple batches and determine the distribution in each package In a study to support drug discovery for patients with lung cancer, patients were divided into three groups based on the severity of the disease. Smoking and alcohol consumption habits recorded for all three groups. This is an example of an observational study or experimental study? - ANSWER-This is an observational study In a survey conducted to find out the feedback of a sports program organized in a club, the organizers asked the respondents to clarify their feedback as good, fair, Poot, and bad. Is the study observational or experimental? if it is an experiment what is the control factor? - ANSWER-The study is an observational study In order to study the shoe sizes of people in his town, Billy samples the population by dividing the residence by age and randomly selecting a proportionate number of residents from each age group. What type of sampling is used? - ANSWER-Stratified sampling In order to study the wrist sizes of people in her town, Catherine samples the population by dividing the residence by age and randomly selecting a proportionate number of residents from each age group. What type of sampling is used? - ANSWER-Stratified sampling Is a survey of the guests about their preference of food at a party and observational study or experimental study? If it is an experiment, what is the controlled factor? - ANSWER-The study is an observational study Is the statement below true or false? Data Is a set of observations or possible outcomes - ANSWER-True Kenneth collected data from a random sample of 800 voters in his city asking whether or not they would vote to reelect the current governor. Based on the results he reports that 64% of the voters in the state would vote to reelect the current governor. Why is this statistic misleading? - ANSWER-The sample is biased Parameter - ANSWER-Is a number that is used to represent a population characteristic. Qualitative - ANSWER-Is defined as an attribute his values indicated by label Raymond wants to estimate the percentage of parents that use cloth diapers. He asks a randomly selected group of 200 parents whether or not they use cloth diapers. What is the parameter? - ANSWER-Percentage of all parents that I use cloth diapers Response variable - ANSWER-Is defined as the dependent variable in an experiment Sampling error - ANSWER-Is defined as the natural variation that results from selecting a sample to represent a larger population Sampling error best fits which of the following descriptions? - ANSWER-The natural variation that results from selecting a sample to represent a larger population Stratified sampling - ANSWER-Involves dividing the population into groups and randomly selecting a proportion number of individuals from each group Systematic sampling - ANSWER-Randomly selecting a starting point and a list of names and then taking every ninth piece of data from a listing of the population To determine whether or not grade level influences time spent studying, Samuel has designed a survey. What is the response variable? - ANSWER-Time spent studying What is the type of quantitative data test result of measuring? - ANSWER-Continuous Which of the following best describes the term response variable? - ANSWER-The dependent variable in an experiment Which term best describes data that is an attribute whose value is indicated by label? - ANSWER-Qualitative