BCTC Stats Final Exam 2024 with Guaranteed Correct Answers

voluntary response sample - correct answer A sample in which the subjects themselves decide whether to be included in the study. No, and no - correct answer The x-values are weights measured in September and the y-values are their corresponding weights measured in April of the following spring.That is, is each x-value associated with the corresponding y-value in some meaningful way? In table 2, does it make sense to use the difference between each x-value and the y-value that is in the same column? Is there a relationship or an association between the weight of a car and its fuel consumption amount? - correct answer In the data table below, the x-values are the weights (in pounds) of cars and the y-values are the corresponding highway fuel consumption amounts (in mi/gal). Given the context of the car measurement data, what issue can be addressed by conducting a statistical analysis of the values? The likelihood of getting these results by chance is very small. - correct answer What does it mean for the findings of a statistical analysis of data to be statistically significant? In a very large study, it was found that Treatment I resulted in 93% success while Treatment II resulted in 75% success. - correct answer Which of the following would be considered practically significant? A parameter is a numerical measurement of a population; a statistic is a numerical measurement of a sample - correct answer How do a parameter and a statistic differ? Parameter because the value is a numerical measurement describing a characteristic of a population. - correct answer Determine whether the given value is a statistic or a parameter: In a study of all 2484 professors at a college, it is found that 65 % own a computer. Discrete - correct answer Determine whether the value is from a discrete or continuous data set: Number of coins in a jar is 78 pop.= teenagers who are 16 to 19 years of age and live in North America sample: the 1215 teenagers who are 16 to 19 years of age and live in North America - correct answer A polling organization contacts 1215 teenagers who are 16 to 19 years of age and live in North America and asks whether or not they had driven a car on a highway recently. What is the population in the study? What is the sample in the study? hair color - correct answer Which of the following would be classified as categorical data? People with special interests are more likely to respond, so the sample is likely to be biased. - correct answer Why is a voluntary response sample generally unsuitable for methods of statistics? No, because the response rate is low and it is a voluntary response sample. - correct answer A researcher determines that he needs results from at least 500 subjects to conduct a study. In order to compensate for low return rates, he mails a survey to 10,000 subjects and receives 524 responses. Is his sample of 524 responses a good sample? It is possible that the test is unbiased and the failures are attributable to other factors, such as differences in experience and training - correct answer A study showed that, in Collin County, a minority group failed the Police Captain Examination at a much higher rate than the majority group. Conclusion: The exam is biased and causes members of the minority group to fail at a much higher rate. self-interest study - correct answer Several studies showed that after drinking an energy drink, subjects had increased performance when running a marathon. A beverage company financed this research. What is wrong with this study? a. 30% b. 0.228 c.305 d. 63.3 % - correct answer a. Convert the fraction three tenths to an equivalent percentage. b. Convert 22.8% to an equivalent decimal. c. What is 61% of 500? d. Convert 0.633 to an equivalent percentage. With a random sample, each individual has the same chance of being selected. With a simple random sample, all samples of the same size have the same chance of being selected. - correct answer What is the difference between a random sample and a simple random sample?