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A researcher conducts a hypothesis test using a sample of n = 20 from an unknown population. What is the df value for the t statistic?
An experiment on the side effects of pain relievers assigned arthritis patients to take one of several over-the-counter pain medications. Of the 445 patients who took one brand of pain reliever, 25
Patty is trying to determine which of two courses to take. If she takes the operations research course, she believes that she has a 10% chance of receiving an A, a 40% chance for a B, and a 50% chan
Find a 95% confidence interval for the difference mean concentration between the shoot and the root.
The figure lists the final grades in Dr. Gooch's entomology class. What percent of the students scored better then C? Round your answer to the nearest integer. Please show work
Is the sampling distribution normal? Why? What is the mean and what is the standard deviation of this sampling distribution. What is the probability that a randomly selected Manhattan apartment has a
Find the current exchange rates online and post the current exchange between the U.S. dollar and any other currency. Briefly describe what has happened over the past year between the two.
You have to provide expected values, degree of freedom, 95% confidence level and the critical value in Chi square distribution table to confirm your statement.
The following table gives the number of students enrolled from 2007 to 2011. If the percentage of average enrollment is the hypothesis, please verify the relationship between the class level (indepe
A sample of size n = 54 recent lobectomy patients is easily available. What is the power of a 2-sided test based on only these patients?
Two roads join Ashville and Benson, and two further roads join Benson to Carlyle. Ashville is directly connected to Carlyle using a railroad. All four roads and the railroad are independently blocke
How many RNA chains have two A's, two U's, two C's, and two G's, and have no repeated base? I have to use inclusion-exclusion theory.
Let X and Y be independent exponential variables with parameters a and b , respectively. Calculate the distribution and density functions of Z = min ( X, Y ) and W = max (X, Y)
Let X1 ,X2 ,:::,Xn be independent and U (0, 1) distributed. Calculate the distribution and density functions of
P( X = 1) = P( X = 0) = 1/2, Z _ N (0,1), and they are independent. Calculate the density functions of X+Z
P( X = 1) = P( X = 0) = 1/2, Y : U (0,1), Z : U (-1,1), and they are independent. Calculate the distribution and density functions of X+Y and X+Z
A corporation has 25 manufacturing plants. Of these, 18 are domestic and 7 are located outside the United States. Each year a performance evaluation is conducted for 4 randomly selected plants.
tion in which the probability of success is p=0.50, if a sample of 300 items is taken, then complete parts a and b. Calculate the probability the proportion of successes in the sample will be between
A gambler has in his pocket a fair coin and a two-headed coin. He selects one of the coins at random, and flips it three times. What is the probability that the coin he selected was the fair coin gi
What is the distribution of the number of original data packets that are lost? Give the probability mass function with parameter(s) specified.
One of the advantages of using an ANOVA (compared to using t-tests) is also a disadvantage-using an ANOVA makes it necessary to use post hoc tests if there is a significant main effect. We use a pos
On Monday, Pan was not stopped by any red lights on his drive to school. What is the probability that his drive was between 12 and 14.5 minutes on Monday? What is the standard deviation of Pan's dri
A customer service center receives phone call at a rate of 10 per hour. Let C be the number of phone calls received in a 4 hour shift. Let T be the inter-arrival time (in hours) of between 1st and 2
Let X be a continuous random variable with density function f(x)= 6x(1-x), 0<x<1. Find E(X), Var(X)