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How to understand this: Find the probability that this person is a Female or an Independent. Now do I consider all females in my data set and then just independents excluding the females or includin
A gasoline tank for a certain car is designed to hold 15 gallons of gas. Assume the population is well approximated by a normal curve with mean 15.0 gal and standard deviation 0.085 gal. What is th
A person watches 5 trucks go by. Use the mean and standard deviation to determine if it is unusual for none of the trucks to be speeding. Show your work.
What is the population and variable? What parameter is being estimated? How is the margin of error related to the maximum error of estimate
Suppose that the mean value of interpupillary distance for all adult males is 65 mm, and the population standard deviation is 5 mm. Assume that the distribution of interpupillary distances is approx
In the following probability distribution, the random variable X represents the number of activities a parent of a student in kindergarten though fifth grade is involved in.
The percentage of ash content in a large number of scoops of coal was found to have a mean of 17.92 and a standard deviation of 2.03. Suppose that a random sample of n scoops were drawn and the mean
Reject the null hypothesis, there is significant evidence that she will receive less than 59% of the vote. Fail to reject the null hypothesis, there is not significant evidence that she will receive
Assume that the percentage decrease in drying time is normally distributed. 5.1 6.5 3.7 6.0 3.7 2.3 2.7 4.3 (a) Find the 95% confidence interval for the true mean decrease in the drying time based o
Find the 95% confidence interval for the true mean decrease in the drying time based on this sample. (Give your answers correct to two decimal places.) to (b) Do you think these percentages average
Calculate the 99% one-sided lower limit to the population proportion and the two-sides CI and compare. Determine the size of a sample needed to be at least 95% confident tha the estimate p within 0.0
Find the marginal densities for both X and Y. What type of random variable is Y? Intuitively speaking, are X and Y independent? Jusify your answer mathematically.
Assume the distribution of the length of the cuts follows the normal distribution with a population standard deviation of 10 seconds. Suppose we select a sample of 25 cuts from various CDs sold by
A customer enter a bank and finds that all three tellers are occupied and he is the next in line. Suppose the mean transaction time are 5 minutes and are independent exponential random variables. W
A case-control study yields a 2x2 table with 2n observations in the upper-left cell, and n observations in each of the other three cells. Find the minimum value of n so that a 95% CI for the OR is e
What is your expected winnings if you win $30 on a roll of a double 6 (dice), and you lose $1 otherwise. (So the random variable X whose expectation you are trying to compute is 30 when you roll a (
A study of the attendance at the University of Alabama's basketball games revealed that the distribution of attendance is normally distributed with a mean of 10,150 and a standard deviation of 2,200
They feel they can resell the property for $120,000 with probability 0.15, $100,000 with probability 0.45, $80,000 with probability 0.25 and $60,000 with probability 0.15. Compute the expected profi
At the completion of the experiment, the experimenter will have two sets of scores. Do these two samples represent dependent or independent samples? Explain.
In using the F-test to test equality of variances in a two-tailed test, what can we do to insure that we will not need a left-tail critical value of F? Why is it of importance for a healthcare profe
Shawn and Maddie purchase a foreclosed property for $50,000 and spend an additional $27,000 fixing up the property. They feel they can resell the property for $120,000 with probability 0.15, $100,00
The speeds of care on a particular interstate are normally distributed with a mean of 74 mph and a standard deviation of 6 mph. Find the percentage of cars traveling on this highway waith a speed of m
A polling company uses random digit dialing to select the households to be interviewed. In one city, in 1000 calls, 15% of the calls reach an unlisted number. This is not surprising, since 18% of th