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A shipment contains 15 items of which 3 are defective. Two items are certain at random. What is the probability that exactly one of the two items selected is defective? (It may be helpful to draw a
A study of volatility of 40 country's stock market returns was conducted by the considering the standard deviation of such returns, the country's credit rating, and whether or not the country is dev
Finding the probability of each event in a group of events of different possibility.
In a class of 50 students, 28 are Democrats, 13 are business majors, and 3 of business majors are Democrats. If one student is selected at random from the class, find out the probability of choosing
There are six balls in an urn. They are identical except for colour. Two are red, three are blue, and one is yellow. You are to draw a ball from the urn, note its colour, and set it asid
Out of the 750 households in survey of the previous exercise, 451 have computers. If possible, find out a 99.7% confidence interval for percentage of all the 50,000 households with computers. If thi
Finding the probability of each event in a group of events of different possibility. The following table summarizes a survey involving the relationship between living arrangements and grade point av
For the duration of the last hour, 30 birds visited our feeding station. There were 6 finches, 4 blackbirds, 2 cardinals, 11 doves and 7 sparrows. Employ this information to resolve the e
A deck of cards is well shuffled deck of the 52 cards. (Four suits-spades, diamonds, hearts, clubs, each with ace through ten, plus three pictures cards-jack, queen and king.) Find the following chanc
Find the probability that a class of 50 students using the new book will have a (sample) mean as large as or larger than 76 if the new book were equivalent to the old book (i.e., if U= 74 and O = 14
An appliance manufacturer claims that the mean life of its product is 1200 hours. Imagine that the standard deviation is 120 hours. A consumer agency decides to randomly select 35 items and will rej
A machine has been designed to toss the coin automatically and keep track of number of heads. After 500 tosses, it has 245 heads. Express chance error both in absolute terms and as a percentage of n
At a large factory, mean wage is $42,500 and the standard deviation is $2000. What is the possibility that the mean wage of 75 randomly selected workers will exceed $43,000.
A population has mean 325 and variance 144. Presume the distribution of sample means is generated by random samples of size 36.
Find out the expected value and standard error for the number of head Determine the chance of getting number of heads between 40 and 60 heads
A large urn contains a collection of balls, 1/3 numbered 0, 1/3 numbered 2 and 1/3 numbered 4. An experiment consists of selecting a ball, noting its number, putting the ball back, selecting another
When performing a chi-square test for independence, make clear how the "cell frequencies under the independence assumption" are calculated. For what purpose are these frequencies calculated.
Find the 90 percent confidence interval for the variance and standard deviation for the time it takes a state police inspector to check a truck for safety if a sample of 27 trucks has a standard dev
An organization is interested in the level satisfaction with a recent initiative to get better job satisfaction, and in particular if there is an association between gender and satisfaction. They su
Are teen's attitudes toward trying cocaine dependent on their GPA? Using data from the MTF 2006, test whether attitude toward trying cocaine is independent of high school GPA (∝ = 0.01).
The issue of how much have to be spent to solve particular U.S. social problems is a complex matter, and people have diverse and conflicting ideas on these issues.
9 randomly particular statistics quiz scores are listed below. make use of a .10 level of significance to test the claim that the variance of all scores in the population is more than 9.
One possible side effect of air pollution is genetic damage. A study designed to examine this problem exposed one group of mice air near a steel mill and another group to air in a rural area. The st
One possible side effect of air pollution is genetic damage. A study designed to observe this problem exposed one group of mice air near a steel mill and another group to air in a rural area. The st