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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?
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.
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
Assume 10% of the engines manufactured on an assembly line are defective. If engines are randomly selected one at a time and tested. What is the probability that the third nondefective engine will b
What is the variance in number of wells drilled before getting a strike? d. What is the probability that two or more wells will be drilled before getting a strike?
A forgetful child tries to count the Skittles in a package, but he often loses his place and double-counts a Skittle. For each Skittle in the package, the child counts it and then, with probability
A player of a video game is confronted with a series of 3 opponents and a(n) 72% probability of defeating each opponent. Assume that the results from opponents are independent (and that when the pla
Determine the probability that a failure is due to induced substance. Determine the probability that a failure is due to disease or infection.
Suppose that A1, A2 are events such that P(A1B)>0. Show that A1 and A2 are conditionally independent given B (i.e., P(A1A2|B)=P(A1|B)P(A2|B) ) if and only if P(A2|A1B)=P(A2|B).
In a major league baseball worl series, two teams A and B play a sequence of games against each other,and dthe first team that wins a total of four games wins the series. Suppose the outcomes of all
Two students A and B are both registered for a Probability class. Neither student has a sterling attendance pattern. Student A attends class 75% of the time, and even worse,student B attends class o
For the purpose of redesigning their manufacturing process, they want to know the most important factor. What would that be?