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A researcher obtained a random sample of n = 60 students to determine whether there were any significant preferences among three leading brands of colas. Each student tasted all three brands and selected his or her favorite. Population data suggests that 50% prefer brand A, 30% prefer Brand B and...
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1. What is the 95.44 percent confidence interval for the estimated satisfaction level (8.5) in the benchmark survey? What is the 99.74 percent confidence interval?
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Tim Worker is doing his budget. He discovers that the average miscellaneous expense is $45.00 with a standard deviation of $16.00. What percent of his expense in this category would he expect to fall between $38.60 and $57.80? The z for $38.60 = -.815.544.328.8.4. The percent of area...
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70% of all americans can do routine computations. if an employer were to hire 8 randomly selected americans, determine the probability distrabution
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Assume that the mean score on a certain aptitude test across the nation is 100, and that the standard deviation is 20 points. Find the probability that the mean aptitude test score for a randomly selected group of 150 8th graders is between 101.5 and 98.5.
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as a report in runner's world magazine, the times of the finishers in the new york city 10 km run are normally distributed with mean 61 minutes and standard deviation 9 minutes part A) Determine the percentage of finishers with times between 50 and 70 minutes part B)Find the percentage of...
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What type of spectrum would a new planet be?
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I am having trouble interpretated these charts could you help me with this information.
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Calculate the z-test statistic to test the difference in SAT math scores from students in Delaware and New jersey. A sample of 45 students from Delaware had an average score of 560 with a standard deviation of 110 while a sample of 40 New Jersey students had an average score of 530 with a...
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Business Week conducted a survey of graduates from 30 top MBA programs (Business Week, September 22, 2003). The survey found that the average annual salary for male and female graduates 10 years after graduation was $168,000 and $117,000, respectively. Assume the population standard deviation for...
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- 1. A school administrator wonders if students whose first language is not English score differently on the math portion of the sat exam than students whose first language is English. The mean SAT math score of students whose first language is english is 516 on the basis of data obtained from the college board. A simple random sample of 20 students whose first language is not English result in a sample mean SAT math score of 522. SAT math score are normally distributed with a population standard deviation of 114. Why is it necessary for SAT math scores to be normally distributed to test the hypothesis?
- 2. What are the steps espoused by Applied Statistics in Business and Economics for formal hypothesis testing? Why is the sequence important?
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