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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?
In the manufacturer sector, the types of items measured, for example average call times, product weights, container volumes, etc tend to be such that when corresponding frequency histogram is graphe