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An organisation wants to estimate the actual electricity usage of a refrigerators that has an advertised energy usage of 439. It tests a random sample of n = 18 fridges and finds a sample mean usage of 445 and a sample standard deviation of 40. Assume that the energy usage in the population is normally distributed.
(a) Do you think that the organisation should accuse the manufacturer of producing fridges that do not meet the advertised energy consumption? You should justify your answer with a hypothesis test.
(b) Construct a 95% confidence interval estimate of the population mean energy usage for this model of refrigerator.
You are a public relations advisor for local firefighters who are threatening to strike on the grounds that since 2000 the city council
A furniture store claims that a specially ordered product will take, on average, mean= 35 days (5 weeks) to arrive. The standard deviation of these waiting times is 5 days.
What is the probability of encountering a person of type A blood? What is the probability of encountering a person who has either type A or type AB blood?
a plant purifies its liquid waste and discharges the water into a local river. the epa collects water specimens of the
The analyst asked for a sample of 100 from each program and then measured their proficiency. The results are as follows.
the rayleigh probability density function is the special case of the weibull probability density function when alpha
The manager for the Jiffy Lube in Saratoga, Florida, has collected data on the number of customers who agreed to purchase an air filter when they were also.
a pew internet and american life project 2007 report stated that 74 of teenage boys posted their photo on their online
the life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 10
The probability that the speed will be more than 70 words per minute is 0.15. Find the mean and the standard deviation of typing speed.
Draw a dotplot comparing the two data lists and explain how the plot shows that the standard deviation for List 1 is greater than the standard deviation for List 2.
Fine Fast Foods restaurant is interested in looking at their staffing for the lunch rush, running from 10 AM to 2 PM. People arrive as walk-ins, by car, or on a (roughly) scheduled bus, as follows: - Walk-ins-one at a time, interarrivals are expon..
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