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The accounting department at Weston Materials, Inc., a national manufacturer of unattached garages, reports that it takes two construction workers a mean of 32 hours and a standard deviation of 2 hours to erect the Red Barn model.
Assume the assembly times follow the normal distribution.
1. Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
2. What percent of the garages take between 29 hours and 34 hours to erect?
3. What percent of the garages take 28.7 hours or less to erect?
4. Of the garages, 5 percent take how many hours or more to erect?
Write a brief summary of the distribution of life expectancy.
Kannon Camera has developed a new camera that it claims can take an average of more than 10 photographs per second. You decide to evaluate the company's claim.
If profit earned in the manufacture and sale of X units of a product is P dollars where: P = 10X - 0.001X2
a) Specify the null and alternate hypotheses for testing that the population correlation is negative. b) Calculate the estimate of the population correlation coefficient between X and Y.
It is estimated that the probability that the general population will live past their 85th birthday is 5.4%. Use the standard normal distribution to approximate this Binomial problem and answer the following questions.
A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 99% confident that her estimate is correct.
In a study relating the amounts of time required for room service delivery at a newly opened Radisson Hotel, 20 deliveries had a mean time of 24.2 min and a standard deviation of 8.7 min. The sample data appears to have a bell-shaped distribution...
Describe the data for a correlational research study. Explain how correlational research is different from other research evaluating the relationship between two variables.
A business has 5 telephone lines. The first rings every minute on the average, the second every ½ minute, the third every 2 minutes, the fourth every 5 minutes,
Based on this sample information, develop a 90 percent confidence interval for the population mean yearly premium.
Provide the factorial notation for the following experimental design. Two independent variables:
Write down the advantages and disadvantages of using computer software for decision making.
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