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Is the accounting system the same for a merchandising business and a service business? Explain.
The heights of people of the same sex and similar ages follow a Normal distribution reasonably closely. Weights, on the other hand, are not Normally distributed.
A survey of Statistics students includes information on their age, college major, expected salary after graduation, and their Social Security number. Who are the individuals, what are the categorica
A game consists of flipping a coin repeatedly until two heads or two tails are obtained. Assume that flips are independent and that at each flip P(H) = 0.6 and P(T) = 0.4. Define the random variable
Weakly earnings on a certain import venture are approximately normally distributed with a known mean of 219 and unknown standard deviation. If the proportion of earnings over 291 is 0.155, find the
The annual assets for First Michigan corporation is aproximately normally distributed with standard deviation 50. The mean is not known. However it is known that 2.5 percent of the assets is over 31
The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.3 miles per gallon.
Find two values of the normal random variable with mean 73 and standard deviation 8 lying symmetrically on either side of the mean and covering an area of 77% between them. A.75.336, 70.664 B.66.76
Describe the general purpose of a z score and explain how a z-score accomplishes this goal.
A certain disease is found in one person in 5000. If a person does have the disease, the test will show a positive result 93% of the time. If a person does not have the disease, the test in 1 out o
Payment times of 100 randomly selected cus- tomers this month had an average of 35 days. The standard deviation from this group was 2 days. Build a 90% two-sided confidence interval on the mean paym
List the sample space of this experiment. Define a random variable X to be the sum of the dice. Write down the probability mass function of X.
Assuming a confidence level of 95%, the likelihood of an item being delivered on time(when it was mailed between Dec. 10 and Mar. 3) is in the interval ____ , ____ Round to four decimal places as n
Shown below is a portion of a computer output for a regression analysis relating Y (demand) and X (unit price).
Perform an F test and determine if the price and the number of flash drives sold are related. let a = 0.01. Perform a t test and determine if the price and the number of flash drives sold are related.
From his records, he selects a random sample of 70 sales and finds the mean number of gallons sold is 5.70. What is the point estimate of the population mean? Determine a 98% confidence interval for
A sample of 250 observations is selected from a normal population for which the population standard deviation is known to be 24. The sample mean is 20.
Spare servers are maintained in stock to support IT operations. A study determined that on average, there are four demands for this type of server per day. What is the probability that on a given da
What is the lottery's expected profit per ticket? What is the lottery's standard deviation profit per ticket?
The following regression model has been proposed to predict sales at a computer store. Y hat = 50-3(x1)+20(x2)+10(x3) where x1 = competitors previous day's sales (in $1,000s) and x2 = population wit
A student studying for a vocabulary test knows the meanings of 14 words from a list of 20 words. If the test contains 10 words from the study list, what is the probability that at least 8 of the wor
With this system, what is the probability of getting the correct signal? [This probability is called the reliability of the communication or transmission system.] Is the probability high enough?
Using correct notation find the probability that a randomly Koi is yellow. Use 3rd decimal accuracy in your answer. Using correct notation find the probability that a randomly drawn Koi is female, g