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What is the probability of a positive soil test? B. Given a postive soil test, what are the revised probabilities of finding the three different types of oil? C. How should the firm interpret.
The Arc electric company had an income of 101 million dollars last year. Suppose that mean income for the firms in the industry for a year is 95 million dollars with a standard deviation of 3 millio
f 2 detection systems are installed in the same area and operate independently, what is the probability that at least 1 of the systems will detect the attack
Is there enough evidence to believe that the average credit card debt has increased? Use a=0.05. Give a possible reason as to why or why not the debt was increased.
Harley Davidson motorcycles makes up 14% of all motorcycles registered in the US. You plan to interview an SRS of 400 motorcycle owners. What are the mean and standard deviation of the proportions o
the regional tupperware dealers earned these commissions last month: $4,377.47, $3,183.76, $1,970.16, $2,270.88, $3,860.06, $2,508.55, $1,569.64, $4,205.30, $1,663.68, $3,960.71.what was the mean co
Briefly describe correlational research. Name a variable from this study and one from the workplace that might prove to provide a correlational relationship and explain why you would choose these tw
Temperature is used to measure the output of a production process. When the process is in control, the mean of the process is µ = 128.5 and the standard deviation is σ = .4.
Suppose n = 4 dog owners are randomly selected. Find the expected number of persons, in the sample, who buy their dog holiday presents.
The manager wants to adjust the mean to reduce the reject rate. Compute the probability of underfilling for several values of the mean fill. How much extra per wall does it cost to ensure a 99% acce
In a study it was found that the average age of cable TV shoppers was 48 years. Suppose you want to test the null hypothesis, H0: μ=48, using a sample of n=70 cable shoppers a. Find the p-value o
A study of n=50 hospital employees found that the number of latex gloves used per week by the sampled workers is summarized by x = 23.1 and s = 12.5. Let μ represent the mean number of latex glo
An important factor in selling a residential property is the number of people who look through the home. A sample of 12 homes recently sold in the Buffalo, New York, area revealed the mean number l
A company has 25 cars of this model in its fleet. What is the level L such that the probability that the average NOX level for the fleet is greater than L is only 0.01?
a rectangular pig pen measures 30 ft by 45ft. if fencing costs 16$ per yard, how much will it cost to enclose the pen?
Suppose data collected by observers at randomly selected intersections across the country revealed that in a sample of 85 drivers 60 were using their cell phones.
Prices for each weekly shipment of rats follows the distribution below $10 with a probability of .45, 12.5 with a probability of .2, $15 with a probability of .35. How much should the lab budget for
What would be the minimum SAT score if test scores were normally distributed with a mean of 1000 and a standard deviation of 200?
A firm has a current assets of $800,000, current liabilities of $600,000. The firm uses $200,000 of its cash balance to pay off a current liabilities. Calculate the current ratio before and after th
Copying times average 8 minutes according to an exponential distribution. What are the operating characteristics for this system?
A survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?
Ray Cahn, who is currently a commodities broker, is also considering an investment, although he believes that there is only an 11% chance of success. What do you recommend?
Apply the chi-square test to these data to test the hypothesis that the distribution is Poisson with mean 1.0. Again let α = 0.05
A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage
What is the probability that the poll gets a sample in which fewer than 45% say they do not get enough time for themselves. Show your method.