A country conducts a study on new cars within the first 90 days of use. The...
A country conducts a study on new cars within the first 90 days of use. The cars have been categorized according to whether the car needs a warranty-based repair (yes or no) and the car's origin (domestic or foreign). Based on the data collected, the probability that the new car needs warranty repair is 0.09, the probability that the car was manufactured by a domestic company is 0.73, and the probability that the new car needs a warranty repair and...
Each year, ratings concerning the performance of new cars during the first 90 days of use are compiled. Suppose that the cars have been categorized according to whether a car needs warrantyrelated repair (yes or no) and the country in which the company manufacturing a car is based (domestic or foreign). Based on the data collected, the probability that a new car needs a warranty repair is 0.08, the probability that a car was manufactured by a domestic company is...
Suppose warranty records show the probability that a new car needs a warranty repair in the first 90 days is .05. If a sample of twenty (20) cars is selected, what is the probability that: a) none of the cars will need a warranty repair? b) at least one needs a warranty repair? c) more than three need a warranty repair? d) no more than five need a warranty repair?
Suppose that past records indicate that the probability that a new car will need a warranty repair in the first 90 days of use is 0.04. If a random sample of 400 new cars is selected, what is the probability that the proportion of new cars needing a warranty repair in the first 90 days will be: a. between 0.05 and 0.06? i.e. P(0.05 sp < 0.06) = ranswer to 4 decimal places). b. above 0.07? i.e. Plp > 0.07)...
SELF 4.24 What business and technical skills are critical Test for today's business intelligence/analytics and infor- mation management professionals? As part of InformationWeek's 2013 U.S. IT Salary Survey, business intelligence/analytics and information management professionals, both staff and managers were asked to indicate what business and technical skills are criti- cal to their job. The list of business and technical skills included Analyzing Data. The following table summarizes the responses to this skill: k. ity the hat PROFESSIONAL POSITION act- Management...
1. Toby's Trucking Company determined that on an annual basis, the distance traveled per truck is normally distributed, with a mean of 50,000 miles and a standard deviation of 12,000 miles. a. What proportion of trucks can be expected to travel between 38,000 and 62,000 miles in the year? b. What percentage of the trucks travel less than 35,000 miles in the year? c. What percentage of the trucks travel more than 57,000 miles in the year? d. How many...
a. Coal is carried from a mine in West Virginia to a power plant in New York in hopper cars on a long train. The automatic hopper car loader is set to put 75 tons of coal into each car. The actual weights of coal loaded into each car are normally distributed, with mean μ = 75 tons and standard deviation σ = 1.6 ton. (a) What is the probability that one car chosen at random will have less than...
1. Coal is carried from a mine in West Virginia to a power plant in New York in hopper cars on a long train. The automatic hopper car loader is set to put 76 tons of coal into each car. The actual weights of coal loaded into each car are normally distributed, with mean μ = 76 tons and standard deviation σ = 0.5 ton. (a) What is the probability that one car chosen at random will have less than...
Concept 8. When calculating a 95% confidence interval for a population mean, which is the most important situation where use of the t distribution would be better than use of the normal distribution? Write the letter for the best choice. A. When the sample size is small. B. when the population standard deviation is unknown. C. when the sample standard deviation is unknown. D. When the population standard deviation is known. E. When the sample size is large. For 9...
A consumer advocacy group is doing a large study on car rental practices. Among other things, the consumer group would like to do a statistical test regarding the mean monthly mileage, H, of cars rented in the US, this year. The consumer group has reason to believe that the mean monthly mileage of cars rented in the U.S. this year is less than last year's mean, which was 2750 miles. The group chooses a random sample of 75 cars rented...