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A sample of 15 teachers from Rhode Island has an average salary of $35,270, with a standard deviation of $3256. As ample of 30 teachers from New York has an average salary of $29,512, with a standard deviation of $1432.
Is there a significant difference in teacher's salaries between two states? Use a = 0.02. Find the 98% confidence interval for the difference of the two means.
Suppose that scores on a particular test are normally distributed with a mean of 130 and a standard deviation of 19. What is the minimum score needed to be in the top 5% of the scores on the test?
An investment project is expected to earn $100,000 on average with a standard deviation of $50,000. Assume earnings from this investment project is a normal distribution. Of the next 15 people that invest in this project, what is the probability t..
What is the probability that a visually impaired student gets less than 6.9 hours of sleep?
Scores for men on the verbal portion of the SAT test are normally distributed with a mean 509 and a standard deviation of 112. Randomly selected men are given the Columbia
The national average for the price of a gallon of unleaded regular gas is $1.16. I believe the price is higher in my area of the country. I want to test my claim by randomly selecting gas prices for 25 stations in my area. The following prices are..
Industry standards suggest that 10 percent of new vehicles require warranty service within the first year. What is the probability that none of these vehicles requires warranty service?
If the oven gets hotter than 475 degrees F, the core is defective. What is the probability that the oven will cause a core to be defective?
Of the drivers who stop at a gas station, 92% purchase gasoline, and 6% purchase both gasoline and oil. A total of 7% purchase oil.
Rulertown wants to minimize the average distance between the fire station and a fire. Where should the fire station be located?
Show the sampling distribution of if a random sample of 150 insured individuals is used to estimate the proportion having received at least one ticket.
What is the expected value and variance for the number of contacts in eight attempts?
Using hypergeometric distribution, determine the probability that the sample of 6 will comprise 2 nonconforming watches?
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