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The director of Suntrust Hills company is concerned about the high cost of mortgage loan interest rates. The bank has no possibility of modifying the rates under the current economic conditions. The bank manager decides to survey a sample of the surrounding towns to see what people are paying for similar home interest rates. The telephone sample of 20 homes indicated that the customers are paying X (bar) = $185.4 and s = $32.20 for a yearly contract.
a. Using the 0.05 level of significance, is there evidence that the population mean is above $190?
b. What is your answer in (a) if s = $50 and the 0.10 level of significance is used?
c. What is your answer in (a) if X (bar) = $199.00 and s = $20.20?
Create ADM/PERT diagram. Determine the critical path.
After the presidential debates, a random sample of 1200 voters showed that 540 favored the Democratic candidate; 480 were in favor of the Republican candidate; 40 were in favor of the Independent candidate, and 140 were undecided. At a 1% level of..
Suppose that nine additional firms will be added to the bankruptcy rolls during the next quarter. How many of those failures are likely to be attribute to fraud?
Test the equality of the means of three populations.
If a complete failure occurs, calculate the probability that the fault occurred in:
A study is conducted to assess the impact of caffeine consumption, smoking, alcohol consumption, and physical activity on the risk of cardiovascular disease.
Descriptive statistic results from quarterly sales figures over a 18 year period (73 qtr) are below. Please interpret the standard Deviation and Median in terms of sales results,
At.01 significance level is it sensible to conclude that modification decreased the number of traffic accidents?
Suppose that weights of bags of potato chips coming from a factory follow a normal distribution with mean 12.8 ounces and standard deviation .6 ounces.
Evaluate true mean delivery time to within 5 minutes at 90% reliability level? Suppose that standard deviation for delivery times is 18.2 minutes.
The U.S. Food and Drug Administration (FDA) performed a study that compared the carbohydrate content (as a percentage of weight) of several major brands of corn and potato chips.
A survey on household income in Northeast NJ area gave the following numbers in thousands of dollars:
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