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A consumer-research organization routinely selects several car models each year and evaluates their fuel efficiency. In this year's study of two similar subcompact models from two different automakers were tested. The average gas mileage for 12 cars of brand A was 27.2 miles per gallon, with a standard deviation of 3.8 mpg. The nine brand B cars that were tested averaged 32.1 mpg, with standard deviation of 4.3 mpg. What degrees of freedom must be used to develop the confidence interval for the difference between the two population means
Select one:
A. 16
B. 20
C. 19
D. 21
X(t) is a wide sense stationary stochastic process with autocorrelation function RX (τ ) = 10 sin(2π1000t)/(2π1000t). The process Y(t) is a version of X(t) delayed by 50 microseconds: Y(t) = X(t - t0) where t0 = 5 × 10-5s.
You are given two boxes: one of them containing 900 red marbles and 100 blue marbles, the other one contains 500 red marbles and 500 blue marbles. If we pick one of the boxes randomly. and pick a marble what is the probability that it is blue? If we ..
suppose cracks exist in a certain material and the crack length in micrometers microm of a randomly selected crack is
The number of jobs brought to the center by the customers are independent random variables whose common generating function is g(u). Compute the generating function of the number of jobs brought to the computer center during the time interval (s, ..
a family has two children. what is the conditional probability that both are boys given that at least one of them is a
Find a 95% confidence interval for the difference in the corresponding values of μ. Does this interval include more or fewer values than a 99% confidence interval? Explain your answer.
1.at what age do babies learn to crawl? does it take longer to learn in the winter when babies are often bundled in
To find out the effect of a drug on reaction time, an investigator administered 0, 25, 50, or 75 milligrams to four groups of volunteer rats. The quickness of their response to a tipping platform was measured in seconds.
A company has just manufactured 1694 CDs and 376 are defective. If 9 of these CDs are randomly selected for testing, what is the probablity that the entire batch will be accepted?
if an experimenter crosses intelligence with attractiveness in a factorial design in which intelligence has three
Discuss in groups and comment on the statement that if managers learned how to conduct research by taking a course such as this there would no need to seek outside consultant help to solve their problems.
Would you describe this distribution as symmetric or skewed? Explain.- Are there any outliers? Explain.- Create a boxplot of these data.
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