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A manufacturer of car batteries claims that his batteries will last, on average, 3 years with a variance of 1 year. If 5 of these batteries have lifetimes of 1.9, 2.4, 3.0, 3.5, and 4.2 years, construct a 95% confidence interval for a2 and decide if the manufacturer's claim that a" = 1 is valid. Assume the population of battery lives to be approximately normally distributed.
The director of Heating and Oil at Mitchell Brothers Company is concerned about the high cost of home heating oil being offered to their customers for the upcoming Fall season in Boston, MA. The company has no possibility of modifying the oil pri..
A standard deviation of $18. Construct and interpret a 90% confidence interval to estimate the mean weekly gasoline expenditure.
What is the stock's value at it's highest on 15 days of the year? (Assume that there are 240 trading days in a year).
Calculate the average hours of sleep per night for each sample. According to the 95 part of the 68-95-99.7 rule, 95% of all values of fall within __________ on either side of the unknown mean . What is the missing number?
Is this result adequate to conclude that monkeys spent significantly more time with softer mother than would be expected if there were no preference? Use the two-tailed test with α = .05.
Truck Being Out Of Service On A Particular Day Is .40.on A Particular Day Find The Probability That None Of The Trucks Is Out Of Service.
The population mean of a company's racing bicycles is 9.07 kg (20.0 lb) with a population standard deviation of 0.40 kg. If the distribution is approximately normal
Benz-Merc Cars produces four classes of cars: subcompact, compact, intermediate and luxury. BM also produces trucks and vans. Vendor capacities limit total production capacity to at most 1.2 million vehicles per year.
A sample of 8 jars has a mean of 15.6 ounces and a standard deviation of 0.3 ounce. Is there enough evidence to support the consumer's conjecture at a = 0.05 and how can this be graphed?
Write the event "at least one nonword error" in terms of X. What is the probability of this event? Describe the event X ≤ 2 in words. What is its probability? What is the probability that X
If a remote's maximum range is 10 feet, what percentage of the time will users attempts to operate the remote outside of its operating limit?
The stem-and-leaf display below gives the test scores for the students in Prof. Jones' economics class. Use the display to answer the following questions.
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