Confidence interval for the mean length per bolt of carpet
A study of 65 bolts of carpet showed that their average length was 78.2 yards. The standard deviation of the population is 1.6 yards. Which of the following is the 80% confidence interval for the mean length per bolt of carpet?
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The average age of these millionaires was 54.8 years. If the standard deviation of the entire population of millionaires is 7.9 years, find the 95% confidence interval for the mean age of all United States millionaires.
A student looked up the number of years served by 35 of the more than 100 Supreme Court justices. The average number of years served by those 35 justices was 13.8. If the standard deviation of the entire population is 7.3 years, find the 95% confi
Jennifer wants to find a 95% confidence interval for the time it takes her to get to work. She kept records for 30 days and found her average time to commute to work was 20.5 minutes with a standard deviation for the population of 3.9 minutes.
A four-link kinematic chain has the following link lengths: a = 20 mm; b = 50 mm; c = 70 mm; d = 90 mm. Determine the type of four-bar mechanism obtained when each link is considered fixed one at a time.
A sample of 35 different payroll departments found that employees worked an average of 240.6 days a year. If the population standard deviation is 18.8 days, find the 90% confidence interval for the average number of days worked by all employees wh
Overall height is 5 inches. if the maximum shear stress in the cross section is 0.77 ksi then determine the shear force.
What amount of time represents the highest 30% of excavator working time? The rental fee of each excavator is 200 dollars per hour, if the city rents 3 excavators, what is the expected rental fee per day?
A study of 40 professors showed that the average time they spent creating test questions was 16.5 minutes per question. The standard deviation of the population is 5.8.
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