I need help with stats homework A researcher wants to investigate the mercury contamination in a certain species of fish in a lake Asample of 53 fish was selected and the mean mercury concentration was found to be 0 525 and standard deviation 0.349. A 95% confidence interval would beO a. (0.431, 0.619)Ob. (0.314, 0.519)Oc Background conditions are not satisfied therefore the problem cannot be solved.Od. (0.218, 0.517)

Answered: Image /qna-images/answer/064237f0-b7ab-4784-8ae3-3738452a61b2.jpg

Answered: Aresearcher wants to investigate the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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An amateur meteorologist has moved to a new city and wants to estimate the average summertime temperature immediately outside his apartment. How many days should he sample to produce a 98% confidence interval to within 1.23 degrees of the true average? He believes the standard deviation of his sample will likely be around 3.83 degrees. Round your critical value to exactly 3 decimal places.
In a study of morphological variation in natural populations of fruit fly, it was reported that the mean wing length of 16 females, collected in a certain area, was 4.653 mm with s = 0.012 mm; and the mean wing length of 11 females, collected in a second area, was 4.274 mm with s = 0.02. Let the distribution of the wing length be normal, find a 98% confidence interval on the ratio of the two populations’ standard deviations.
Suppose that the heights of the population of basketball players at a certain college are normally distributed with a standard deviation of 2 feet. If a sample of heights of size 16 is randomly selected from this population with a mean of 6.2 feet, the 90 percent confidence interval for the mean height of these basketball players ________ feet to is __________ feet (round your answer to 2 decimal places)
Suppose the heights of a population of male giraffes are normally distributed with an unknown population mean and a population standard deviation of 3.4 feet. A random sample of male giraffes from the population produces a sample mean height of x¯=15.2 feet. What value of z should be used to calculate a confidence interval with a 90% confidence level?
In a local store a produce manager needs to estimate the mean weight of Texas oranges delivered from farms. In a random sample of 68 oranges, the mean weight is found to be 154 grams. The standard deviation is known to be 9 grams, and the population is normally distributed. What are the lower and upper bounds for a 90% confidence interval of the population mean weight of an orange?
In the year 2017, the mean and standard deviation for the quality grade point average of the first-year students in a basic statistics course is found to be 2.95 and 0.53. If 38 undergraduates are randomly selected, find the 95% confidence interval for the mean of the entire group. Within the same year, if another group of 38 students were sampled and resulted with a mean of 2.87, test the hypothesis that the sample mean is different from the population mean at a 5% level of significance.
A sample of 14 male college students consumes an average of 14.3 gallons of beer per month, with a sample standard deviation of 5.2 gallons. You can safely assume that the population of monthly beer consumption is Normally distributed. What is the margin of error for a 90% Confidence Interval for the mean? (Leave your answer to two decimal places, ex: 18.12)
According to the Canadian Department of Justice, it is a serious offence to drive with 5.0 ng of THC or more per 1 mL of blood (>= 5.0 ng/mL). A research company is hired to test a new THC testing device. A random sample of 56 urine samples is tested and was found to have a mean THC level of 4.7 ng/mL with a standard deviation of 1.1 ng/mL. Calculate the 99% confidence interval for this sample to the nearest tenth. Report only the UPPER LIMIT of your confidence interva
Records of the past 15 years have shown the average revenue of company A for the month of March to be 5.05M pesos, with a population standard deviation of 1.64M. Company B has had an average revenue in March of 3.78M during the past 10 years with a population standard deviation of 0.92M. Find a 95% confidence interval for the difference of the true revenues in these two companies, assuming the observations come from normal populations.
An article reports that in a sample of 7 men, the average volume of femoral cartilage (located in the knee) was 18.7 cm3 with a standard deviation of 3.3 cm3 and the average volume in a sample of 9 women was 11.2 cm3 with a standard deviation of 2.4 cm2. Let μXμX represent the population mean for men and let μYμY represent the population mean for women. Find a 95% confidence interval for the difference μX−μYμX−μY .

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