MATH 1P98 Study Guide - Midterm Guide: Confidence Interval, Null Hypothesis

• School: Brock University
• Department: Mathematics and Statistics
• Course: MATH 1P98
• Professor: Susanna Spektor

Document Summary

Name: __________________________ date: ____________: a sample of 25 different payroll departments found that the employees worked an average of 310. 3 days a year with a standard deviation of 23. 8 days. What is the 90% confidence interval for the average days worked, : 3010. , of all payroll departments: in 2000 there were almost 300,000 canadians with more than 1 million dollars in financial assets! If the average age of one hundred randomly selected millionaires was. 54. 8 years with a standard deviation of 7. 9 years, what is the 95% confidence interval for the mean age, : 53. 5, 53. 3, 52. 8, 51. 7. 57. 7 : the average number of miles that 90 truckers drove in a day was 540 with a standard deviation of 40 miles. What is the 99% confidence interval of the true mean number of miles driven by all truckers: the average score of 64 teenage boys playing a computer game was 100,000 with a standard deviation of 15,000.