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What is the numerical value of your test statistic, z0? Answer to two decimal places. What is the p-value resulting from the test of Part I? Answer to three decimal places.
In the State of OH, 40 percent of all e-mails deal in some way with the depressed U.S. economy. If a random sample of 10 e-mails is selected, what is the probability of the following:
U.S. Bureau of the Census data reveal the largest town in the State of OH has a population of one million families. The data show that acreage owned per family is normally distributed with a mean of
What is a good topic to test using a Randomized Block Design? What would the dependent and independent variable be?
Suppose A, B and C are independent events, with probabilities, P(A), P(B) and P(C). What are the probabilities that at least two of the three events occur, using set notation?
For the normal distribution with µ = 80 and s = 12, determine the X value associated with each of the following proportions: What X value separates the distribution in the top 40% versus bottom
Assume that the manufacturer wants to be sure that the mean net content exceeds 12 oz. What conclusions can be drawn from data (use alpha=0.01).
Compute the numerical value of your test statistic, z0? Answer to two decimal places. Determine the p-value resulting from the test of Part I? Answer to three decimal places.
A company had 80 employees whose salaries are summarized in frequency distribution below. Determine the standard deviation. Compute the standard deviation of the data summarized in the listed freque
When investigating times required for the drive-through service, the following results (in seconds) were obtained. Determine the range, variance, and standard deviation for each of the two samples,
To obtain the best deal on the CD player, Tom called eight appliance stores as well as asked the cost of a specific model. The prices he was quoted are given below:
Use a z-table to find the percentage of the area under the standard normal curve between the two values. Round your answer to the nearest hundredth.
If a random sample of 10 customers has a sample mean of 6.03 minutes and a sample standard deviation of 0.125 minutes what is the probability that a randomly selected customer will spend more than 6
Use a table to find the percentage of the area under the standard normal curve between the two values. Round your answer to the nearest tenth.
A person repeatedly and independent flips a fair coin to decide whether to take a step to the left or to the right from a point X. Determine the expected number of times the person returns to X.
A floor consists of parallel planks which have a two foot width. A circular disc of diameter one foot is randomly and uniformly dropped onto the planks. Determine the probability that the disc does
The average employee in the U.S.A. spends µ = 23 minutes commuting to work each day. Assume that the distribution of commute times is normal with a standard deviation of s = 8 minutes. What is
Two fair six-sided dice are tossed independently. Let X be the firs die, and Y the value of second. Determine the expectation of the following random variables:
What is the probability of randomly selecting an employee who spends more than 35 minutes commuting each day?
At 95% confidence, what is the margin of error? Develop a 95% confidence interval estimate of the mean amount spent for dinner.
A random sample of the ages of 69 college students has a mean of 21. The population is known to be normal with a standard deviation, ?? , of 4. What is the standard error of the mean? (to 2 decimal
Six students, three boys and three girls, lineup in a random order for a photograph. What is the probability that the boys and girls alternate?
For the statistician's suggestion, what is the distribution of the number of tests needed for a group k residents? Define random variable, write down the probability mass function and state what kin
Confidence interval for the population mean: Use of the standard normal. The union for a particular industry has determined that the standard deviation of the daily wages of its workers is 19.
Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu. Assume that the population has a normal distribution.