Question: The Toyota Prius uses both gasoline and electric power Toyota
The Toyota Prius uses both gasoline and electric power. Toyota claims its mileage per gallon is 52. A random sample of 40 cars is taken and each sampled car is tested for its fuel efficiency. Assuming that 52 miles per gallon is the population mean and 2.4 miles per gallon is the population standard deviation, calculate the probability that the sample mean will be between 52 and 53.
Answer to relevant QuestionsA bank that employs many part-time tellers is concerned about the increasing number of errors made by the tellers. To estimate the proportion of errors made in a day, a random sample of 400 transactions on a particular day ...A company supplies pins in bulk to a customer. The company uses an automatic lathe to produce the pins. Factors such as vibration, temperature, and wear and tear affect the pins, so that the lengths of the pins made by the ...Suppose you have a confidence interval based on a sample of size n. Using the same level of confidence, how large a sample is required to produce an interval of one-half the width? An executive placement service needs to estimate the average salary of executives placed in a given industry. A random sample of 40 executives gives x-bar = $42,539 and s = $11,690. Give a 90% confidence interval for the ...An art dealer wants to estimate the average value of works of art of a certain period and type. A random sample of 20 works of art is appraised. The sample mean is found to be $5,139 and the sample standard deviation $640. ...
Post your question