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Biology and Environmental Science
The Atlantic bluefin tuna is the largest and most endangered of the tuna species. They are found throughout the North Atlantic Ocean and the mean weight is 550 pounds.37 The Center for Biological Diversity is concerned that this species has been overfished and that the mean weight has decreased.
Suppose a random sample of 12 Atlantic bluefin tuna was obtained from commercial fishing boats and weighed. The summary statistics were x‾ = 535.7 and σ = 37.8. Conduct a hypothesis test to determine whether there is any evidence that the mean weight of Atlantic bluefin tuna is less than 550 pounds. Assume the distribution of weight is normal and use a = 0.05. Write a Solution Trail for this problem.
According to Honda Motor Co., Inc., the exchange rate (yen per U.S. dollar) from 1998 through 2005 was 123, 128, 112, 111, 125, 122, 113, and 108. Determine the mean and median for these data. Is there a mode? If so, what is its numerical value?
What is the value of k? (Hint: g p 1 y2 5 1.) What is the probability that at most three forms are required? What is the probability that between two and four forms (inclusive) are required?
The price of a certain stock is fluctuating between $10, $20, and $30 from month to month. Market analysts have predicted that if the stock is at $10 during any month, it will be at $10 or $20 the next month, with probabilities 4/5 and 1/5 respect..
Draw a Venn diagram representing events R, C, I, and G.- What is the value of P(R)?- What is the value of P(C or G)?- What is the value of P(R or C′)?
It was originally suspected that raising the process temperature would reduce mean coating thickness. Do the data support this claim? Use the P-value approach and assume that the two population standard deviations are not equal.
A family has 5 children and 1 of them is a boy the percentage of boy is 1/5, or .020. Do you think one could say the chances of any woman having a boy would be 1/5?
Determine if this sample data provides sufficient evidence to indicate that the bulbs have their advertised life expectancy. Do NOT do a confidence interval.
Assume that replacement time for TVs are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years. The probability a randomly selected TV will have replacement time less than 5.5 years to be .0071.
shortly after september 11th 2001 a researcher wanted to determine if the proportion of females that favored war with
For random samples of size n = 25 selected from a normal distribution with a mean of m = 50 and a standard deviation of s =20, find each of the following: The range of sample means that defines the middle 95% of the distribution of sample means.
A statistics instructor wants to know which route will get her to school the fastest. Each day from October 2 to November 15, when she gets to the turn point she checks the odometer on her car
Construct a 99% confidence interval (Konfidenz interval) for the difference in proportions of all adults and all teenagers who watched the program and liked it.
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