MCQ STATS FINAL EXAMQUESTIONS AND ANSWERS

MCQ STATS FINAL EXAMQUESTIONS AND ANSWERS Researchers conducted a telephone survey of 427 adults living in a large city. The adults were asked whether they planned to purchase a smart watch in the next year. The table shows the responses categorized by the region of the city in which the residents live. *table* Which of the following graphical displays is most appropriate for preparing the proportions of those surveyed who plan to purchase a smart watch within the four regions? A scientist recorded the duration of the eruptions of the Old Faithful geyser in Yellowstone National Park that occurred during a one-month time period. The histogram below shows the distribution of the duration, in seconds, of the eruptions. *histogram* Based on the histogram, which of the following is the best description of the distribution? Events D and E are independent, with P( D ) = 0.6 and P( D and E ) = 0.18. Which of the following is true? Researchers used two footballs of the same size to examine the effect of helium on kicking distance. One football was filled with air, and the other was filled with helium. Eleven people participated in the study. Each person kicked the football filled with air and the football filled with helium, and the kicking distances, in yards, were recorded. The football that was kicked first was determined by the flip of a fair coin, and the people did not know which football was filled with air and which was filled with helium. What type of study was conducted by the researchers and, of the following, which is the appropriate t-interval for inference? A survey of a random sample of 1,045 young adults found that 60 percent do not have a landline telephone number. A hypothesis test will be used to determine whether the data provide convincing statistical evidence that more than 50 percent of all young adults do not have a landline telephone number. Which of the following is the test statistic for the appropriate test? An airline recorded the number of on-time arrivals for a sample of 100 flights each day. The boxplot below summarizes the recorded data for one year. *box and whisker* Based on the boxplot, which of the following statements must be true?