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Conduct a hypothesis test to determine whether the whisper number justifies a conclusion of a statistically significant increase in the consensus estimate of economists. Usa a=.01 as the level of s
Conduct a hypothesis test to determine whether the mean number of days until a house is sold is different than the hamilton county mean of 86 days in the nearby county. Use a=.05 for the level of si
Pieces of vulcanite were examined according to porosity and dimensional defects and the results are shown below. Test the hypothesis that the two criteria of classification are independent. Specify
What percentage of the files will take between 80 minutes to 120 minutes to be transferred, cleaned and partitioned?
Find the probability distribution of the profit and the expected value of the profit. Does this venture represent an expected gain or an expected loss? What would your recommendation be to the comp
Two professors are applying for grants. Professor Jane has a probability of 0.65 of being funded. Professor Joe has probability 0.24 of being funded. Since the grants are submitted to two different
Suppose that in reality only 2 in 100 bags actually contain large amounts of liquid. a.) What is the probability a randomly selected bag will have a positive test? Give your answer to four decimal pla
The weight of a candy bar is N(50, 1). We take a sample of 4 candy bars and compute the sample mean. The sample mean equals 51. What is the sampling distribution of the sample mean?
An urn contains w1 white and b1 black balls. A second urn contains w2 white and b2 black balls. A ball is selected at random from the first urn and placed in the second urn. Then a ball is selected
A student in a laboratory course on quality control methods measures the length of a bolt several times. When would it be reasonable to consider these measurement a random sample? What is the popula
Construct a 95% confidence interval for the difference in mean total serum cholesterol levels between participants receiving the new drug versus placebo.
What is the difference in percent taxes paid by the two families? Which family paid the most absolute dollars in taxes? What is the absolute difference in dollars paid by the two families?
Suppose you decide to take a sample of size 2 (n=2) by rolling a die twice. Produce a histogram representing the sampling distribution of the sample mean (percentage frequency on vertical axis, obs
Produce a histogram showing the probaility distribution (probability of outcome on one axis, and outcome value on another axis). In percentage terms, if you rolled a die over and over again, how of
What are the mean, median, mode and standard deviation of potential outcomes for ONE roll of the die?
What is the probability of a sale given that the customer has a trade in? What is the probability that a customer has a trade in and a sale is made?
Consider a carton of twelve eggs, of which three are rotten. Suppose we randomly select five eggs. Compute the probability that there is at least one rotten egg among the selected eggs.
The reply has to be 300-400 words a) What are the characteristics of the standard normal distribution?
Assume that k has a prior distribution, which is Binomial(4; 0:2). A ball is drawn from the bag. Determine the posterior distribution of k if (a) the ball is red and (b) the ball is green.
Given the independent random variables X and Y with respective probability mass functions. Calculate the probability mass function of the sum Z = X + Y .
A six-sigma black belt quality engineer found that in a random sampl of 140 printed circuit boards, 18 are defective due to the result of certain nonconformity tests. At the 5% level of significanc
The following are the numbers of defective parts produced in a shift by 10 workers before and after going through a very rigorous training program (assuming normality):
A hospital would like to determine whether there is a relationship between the level of satisfaction of workers with working conditions and their job category. A random sample of 250 empl
For each of the variables below state what level of measurement it is and is it discrete or continuous
Assuming approximately normal distributions having equal variances for percent wear of tires each brand under test conditions, find a 95% confidence interval for muA - muB