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In a manufacturing process a random sample of 49 bolts manufactured has a mean length of 1.67 inches with a standard deviation of .07 inches. What is the 80% confidence interval for the mean
The 80% confidence interval is (?- , -?-)
Statistics and Probability, Statistics
A bullying prevention program is underway in the phoenix school districts. The researchers ran multiple analyses with the baseline data. The researchers want to determine if there is a relationship between age (13, 14, 1 ...
A recent study found that 64?% of workers between the ages of? 20-29 cash out their retirement accounts when they lose their jobs or move to a new employer. Complete parts a through e below based on a random sample of 14 ...
A researcher is planning to a silvicultural study using 3 different fertilizers on 3 adjacent plots. How many ways can the 3 plots be arranged if there are 18 fertilizers to choose from?
A Diamond can be classified as either gem qulaity or industrial grade. Suppose that 92% of diamonds are classified as industrial grade. Would it be unusual if atleast one of five randomly selected diamonds is gem quality ...
If the probability of either outcome A or outcome B arising during a single random process is 0.4 and we also know that the probability of outcome A is 0.2 while the probability of outcome B is 0.3, how are these two out ...
The board of a major credit card company requires that the mean wait time for customers when they call customer service is at most 3.00 minutes. To make sure that the mean wait is not exceeding the requirement, an assist ...
How do I figure a cusomer's expected return when borrowing money? Example, the customer wants an investment that costs $100 and considers borrowing $80 for one year at 4.6% to help pay for the investment. What is the cus ...
Many high school students take the AP tests in different subject areas. In 2007, of the 144,796 students who took the biology exam 84,199 of them were female. In that same year, of the 211,693 students who took the calcu ...
A stock's price fluctuations are approximately normally distributed with a mean of $26.94 and a standard deviation of $3.54. You decide to sell whenever the price reaches its highest 10% of values. What is the highest va ...
A recent survey of college seniors evaluated how the students view the "real world" that they are about to enter. One question asked the seniors to evaluate the future job market on a 10-point scale from 1 (dismal) to 10 ...
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Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate
Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p
Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As
Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int
Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As