Answer Happy

Question 5 > Electronic scooters have become very popular in large cities, but there is growing concern about their safety. In a randomly selected sample of 22 injuries, the average age of individuals injured was 22 years old, with a standard deviation of 3 years old. The sample appears to be right-skewed. To form a confidence interval check that the conditions were satisfied. (1) Was this a randomized experiment or random sample? O no O yes (2) Are the observations independent? Check with n < 0.05N. < 0.05N What does this tell us the required population size is? N> Note: There have been at least 10,000 electronic scooter-related injuries per year for the last four years. This means that The observations are NOT independent because the sample size is NOT less than 5% of the population size, i.e. n > 0.05N The observations are independent because the sample size is less than 5% of the population size, i.e. n < 0.05N O It is impossible to tell whether the observations are independent or dependent with the given information.

(3) Is the sample size large enough? O No, then < 30 and the population is right-skewed. O Yes, because the population is normal, so even if n < 30 we can assume the sampling distribution is normal. Yes, because n > 30. O It is unknown whether the sample is large enough given the information. Are the conditions for a Confidence Interval satisfied? (i.e. Can you perform a T-Estimate of a mean?) O no O yes