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Find the range of optimality or insignificance for each objective function coefficient. What is the shadow price for the fiber constraint's RHS? Over what range of values is it valid?
What is the likelihood that the mean annual precipitation during 25 randomly picked years will be less than 90.8 inches?
A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percenta
A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following, What percentage of scores falls between +1 and +2 standard deviations?
The amount of Jen's monthly phone bill is normally distributed with a mean of $50 and a standard deviation of $10. Find the 25th percentile.
Standard deviation can be assumed known with 0=9 hours. What is the 95% confidence interval estimate of the mean time it takes an individual to complete a federal income tax return?
The probability of a correct positive on someone who is under the influence of drugs is 99.9%. What is the probability that a person who tests positive is really a drug abuser?
The mean annual cost of automobile insurance is $939. Assume that the standard deviation a= $245. a. What is the probability that a simple random sample of automobile insurance policies will h
Statistics professor wants to ?nd out the average GPA (grade point average) for all students at UMKC. Identify the (statistical) population and (statistical) sample.
A sample of 64 statistics students at a small college had a mean mathematics ACT score of 28 with a standard deviation of 4. Estimate the mean mathematics ACT score for all statistics students at th
What is the difference in students' computer anxiety based on whether or not they own computers? The researchers surveyed 92 undergraduate education students via an online survey.
And 19.01% of clients from Science received help with Stat. What is the probability that a randomly selected helproom client is majoring in Science and received help with Math?
What is the margin of error for a 95% confidence interval? What would you recommend if the study required a margin of error of $150 or less?
Decide whether the market capitalization of companies in the DJIA appears to be approximately normally distributed by Constructing a normal probability plot.
A random sample of size n=30 is obtained from a normally distributed population with a population mean of 98 and a standard deviation of 10. What is the probability that the sample mean is between
A traffic study at one point on an interstate highway shows that vehicle speeds are normally distributed with a mean of 61.3 mph and a standard deviation of 3.3 mph. If a vehicle is randomly checked
An industrial sewing machine uses ball bearings that are targeted to have a diameter of 0.75 inch. What is the probability that a ball bearing will be between the target and the actual mean?
What is the sample variance and the estimated standard error for a sample of n = 9 scores with SS = 72?
Suppose a random sample of 25 swatches are selected. What is the probability that the mean of the sample is less than 235 pounds per square inch.
What is the probability that more than 60 customers pay their accounts balances in full before any interest charges are incurred?
what is the probability that an organization selected at random will have at least one of the three types of benefits?
If probability of demand for 50 units is .40, probability of demand of 100 units is .50, and probability of demand for 150 units is .10, what lot size would you recommend if the goal is to maximize
Based on the information provided, which health outcome (birth defects or cancer) has a stronger association with compound A?
What fraction of the calls last between 5.2 and 6 minutes? As part of her report to the president, the director of communications would like to report the length of the longest (in duration) 4 perce