The time required for a citizen to complete the 2000 U.S. Census "long" form is normally...
Name: 1. The time required for a citizen to complete the 2000 U.S. Census "long" form is normally distributed with a mean of 40 minutes and a standard deviation of 10 minutes. What proportion of the citizens will require less than one hour to complete the census? 2. The time required for a citizen to complete the 2000 U.S. Census "long" form is normally distributed with a mean of 40 minutes and a standard deviation of 10 minutes. The slowest...
Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of 100 minutes and a standard deviation of 10 minutes. What proportion of 1040R tax forms will be completed in more than 102 minutes? Round your answer to at least four decimal places X
The U.S. Census Bureau conducts a study to determine the time needed to complete the short form. The Bureau surveys 200 people. The sample mean is 8.2 minutes, and the sample standard deviation is 2.2 minutes. To calculate a confidence interval for this data, would you use a value from the Z distribution or the t distribution? Write a sentence to explain your choice. (4 points) Calculate the 99% confidence interval for µ, the population mean time it takes to...
(4) The time required to complete a final exam in a particular college course is normally distributed with a mean of 75 minutes and a standard deviation of 15 minutes. Answer the following questions: (a) (for a randomly selected student) What is the probability of completing the exam in 1 hour or less? (4) (b) What is the probability a randomly selected student will complete the exam in more than 60 minutes but less than 75 minutes? (4b) (c) Assume...
The time required to complete a task is normally distributed with a mean of 30 minutes and a standard deviation of 12 minutes. What is the probability of finishing the task in less than 28 minutes? 1) 5662 2) 9672 O3).0328 4).4338
The time required for a student to complete a Statistics exam is normally distributed with a mean of 55 minutes and a standard deviation of 12 minutes. What percent of students take between 40 and 50 minutes to complete an exam? At what point in time will 25 percent of the students have completed the exam?
Commute times in the U.S. are heavily skewed to the right. We select a random sample of 200 people from the 2000 U.S. Census who reported a non-zero commute time. In this sample the mean commute time is 27.5 minutes with a standard deviation of 18.9 minutes. Can we conclude from this data that the mean commute time in the U.S. is less than half an hour? Conduct a hypothesis test at the 5% level of significance. What is the...
3. The time needed to complete a final examination is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes. Answer the following questions. a. What is the probability of completing the exam in one hour or less? b. What is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes (i.e., between 60 and 75 minutes)? c. What is the longest time in minutes it...
The time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes. Answer the following questions: A) What is the probability of completing the exam in ONE hour or less? B) what is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes? C) Assume that the class has 60 students and that the...
Suppose that the time required to complete a 1040R tax form is normally dismbited with a mean of 110 minutes and a standard denation of 20 minutes. What proportion of 1040R tax forms will be completed in at most 129 minutes? Round your answer to at least four decimal places, Answer: