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Find out that margin of error. (90% confident margin of error) In general, if all other features of the situation remain the same, would smaller samples produce smaller or larger margins of error?
Assume x is a binomial random variable with n=100 and p=0.6. The mean, variance, and standard deviation of x are respectively:
Suppose that the population of heights of female college students is approximately normally distributed with mean m of 68.66 inches as well as standard deviation s of 5.13 inches. A random sample of
A communication satellite system can function if at least 2 of the 5 power sources in the system work properly. Each power source works independaently with probability .90. The probability of the sa
Statistics show that approximately 40% of all fatal automobile accidents involve drunk driving. Of the next 5 fatal car accidents on the highway of a city, the probability that 2 of the accidents we
Six people enter an elevator at first floor. The elevator starts going up and is going to stop at 9 floors. Supposing that each person is equally likely to get off at any of these 9 floors, what is
A new drug is being tested to see if it alleviates the effects of vertigo. 16 who have vertigo volunteered to participate in the study. 8 people were given the drug and 8 people were not given the d
A point is randomly chosen with the rectangle whose vertices are (0, 0), (2, 0), (2, 3), and (0, 3). Determine the probability that the x-coordinate of the point is less than the ycoordinate? (Hint:
A bag contains 3 blue marbles, 2 green marbles, 1 white marble and 6 red marbles. Assume a marble is selected from the bag and not replaced. Determine the probability of receiving a blue marble on t
Determine the probability of finding 14 or more requests for hard disk drives with low storage capacity if the VP's assertion is correct. Do you believe that the proportion of customers requesting h
Suppose that a population is normally distributed with mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Why or why not?
A journal article reports that a sample of size 5 was employed as a basis for computing a 95% interval for true average nature frequency (Hz) of delaminated beams of the certain type. The resulting
If a student can choose one of three language courses, one of five mathematics courses, and one of four history courses, how many different schedules can be made?
You are taking a multiple choice exam that has 10 questions in a specific section with five possible answers for each question. You didn't study for the test and you guessed the answers. The probabi
The following statements are true for a binomial distribution except: Binomial is a continuous probability distribution
In certain engineering schools of university, 60% of students are employed and 80% of the students are full-time. Ninety percent of employed are full-time students.
Two students (A and B) are challenged to solve a problem in statistics. Assume that the probability that A will solve the problem is 40%, the probability that B will solve problem is 55%, and probab
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as source, take the fourth, fifth, and sixt
Let X be discrete random variable with probability function f sub x. Find out formulas for probability function and distribution function of Y=(X-a)^2 where 'a' is an arbitrary constant.
Assume we know from past data that standard deviation of the square footage covered by a one gallon can of paint is somewhere between 2 and 4 square feet.
Find a confidence interval for the difference between the corresponding true proportions of men and women who think the environment is a major concern.
Determine the probability that the randomly selected hiree will be designated management trainee but not be appointed to a management position?
A study of ages of motorcyclists killed in crashes involves random selection of 134 drivers with mean of 33.01 years. Supposing that s=9.9 years construct and interpret a 99% confidence interval est
Assume that a random sample is employed to determine a population proportion p. Find out the margin of error E that corresponds to the given statistics as well as confidence level.
A contractor is considering a sale that promises a profit of $23,000 with a probability of 0.7 or a loss(due to bad weather, strikes, and such) of $17,000 with a probability of 0.3. What is the expe