Help with 10-22 please!
When you are asked "What is the population?\When you are asked "What is the sample statistic?\When you are asked \"What is the sampling distribution (and why)?\HOW MANY SCOOTERS ARE POSITIONED TO EARN REVENUE? Bird's data analyst wants to model the number of scooters that start the day ready to earn revenue. They plan to take a random sample of 10 scooters. For each scooter, they will record whether or not that scooter was positioned to earn revenue at the start of the day (was it charged and put out in an approved location). 10. 11. 12. 13. What is the population? Letter (see multiple choices in the instructions) What is the sample statistic? Letter (see multiple choices in the instructions) What sampling distribution should we use to compute the probability in the next question (and why)? Letter (see multiple choices in the instructions) If the probability is 0.9 that a scooter (any one scooter) is positioned to earn revenue at the start of the day, what is the probability that all of the scooters in the sample were positioned to earn revenue? Four decimals, tolerance 0.0005 WEEKLY REVENUE OF A SCOOTER Now, Bird's data analyst wants to model the sample mean and sample variance of net revenue of scooters. They plan to take a random sample of 25 of its scooters in Austin. They will record weekly net revenue brought in by each scooter. They decide it is reasonable to assume that weekly revenue of scooters is approximately normally distributed with a standard deviation of $50 (variance of 2,500 squared dollars). 14. 15. 16. 17. What is the population? Letter (see multiple choices in the instructions) The data analyst starts by modeling the sample mean. What is the sample statistic? Letter (see multiple choices in the instructions) What sampling distribution should we use to compute the probability in the next question (and why)? Letter (see multiple choices in the instructions) If the population mean of the distribution of weekly revenue is $285, what is the probability that mean weekly revenue in the sample will exceed $300? Four decimals, tolerance 0.0005 SAMPLING THEORY 18. Now, the data analyst models the sample variance. What is the sample statistic? Letter (see multiple choices in the instructions) 19. What sampling distribution should we use to compute the answers in the next three questions (and why)? Letter (see multiple choices in the instructions) 20. What is the probability that in the sample, the variance of weekly net revenue will be greater than 3,025 (squared dollars)? Four decimals, tolerance 0.0005 21. Find values a and b such that (i) the probability is 0.9 that the sample standard deviation 5 will be between a and b E (ii) the probability is 0.05 that s will be less than a. What is the value of a? Two decimals, tolerance 0.02 HINT: You are being asked to nd an interval (a, b). This question asks for the lower endpoint, and the next question asks for the upper endpoint. 22. Continued. What is the value of b? Two decimals, tolerance 0.02
