A sample of 10 networking sites for a specific month has a mean of 26.1 and a standard deviation of4.2.PromptsSubmitted AnswersWhich of these is the point estimatorChoose a matchFind the value of ta/2, with 99% confidenceChoose a matchlevel.Find the 99% confidence interval of the trueChoose a matchmean.

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Answered: A sample of 10 networking sites for a…

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 independent knowledge, attitudes and practices survey on COFLU-20 was conducted in a large first-world country. The individual attitude scores were found to be normally distributed with the mean of 5 and a standard deviation of 1.3. For our current investigation of the 300 respondents, the mean score for attitude was found to be 5.6 with a standard deviation of 2.8 The researcher has asked you to use a 3% level of significance, to test whether the population mean score for attitude towards COFLU-20 is significantly different from 5. To conduct this test, you are required to: (a) Explain the meaning of ‘3% level of significance’ to the researcher.
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Carbon dioxide emissions in the European Union had a mean of 8.3 and a standard deviation of 3.3. Canada's carbon dioxide emissions was not included in the data but was 14.4. Find its z-score relative to the distribution of values for the EU nations and interpret the information. Select the choice below that includes a correct z-score and a reasonable interpretation of the information. AO Z-score=1.85 This positive z-score indicates that Canada's emissions are about 2 standard deviations above the mean compared to European Union nations. B.O Z-score= -1.85 This negative z-score indicates that Canada's emissions are about 2 standard deviations below the mean compared to European Union nations. C.O z-score= -1.85 This negative z-score indicates that Canada's emissions are about 2 standard deviations above the mean compared to European Union nations. D.O z-score= 1.85 This positive z-score indicates that Canada's emissions are about 2 standard
The standard deviation of the weights of elephants is known to be approximately 15 pounds. We wish to construct a 95% confidence interval for the mean weight of newborn elephant calves. Fifty newborn elephants are weighted. The sample mean is 244 pounds. The sample deviation is 11 pounds. State the distribution needed. Explain your reasoning. SE
Paint used to paint lines on roads must reflect enough light to be clearly visible at night. Researchers have 2 new types of paints they want to test paint type A and paint type B. For each paint type, they tested if there was statistical evidence the average reflectometer reading is greater than 35. To test each type of paint, they used 15 paint samples. Further, suppose the standard deviation is the same for both types of paints. The sample mean for paint type A was 39 and the sample mean for paint type B was 41.5. For both statistical tests, the significance level is set to .05.Which of the following is true? If they fail to reject the null hypothesis for paint type A we can conclude there is statistical evidence the average reflectometer for type A paint is 35. The p-value for the type B paint test is smaller. They rejected the null hypothesis for both paint types. Exactly two of the statements above are true. None are true.
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A survey was conducted to measure the height of Canadian men. In the survey, respondents were grouped by age. In the 20-29 age group, the height was normally distributed, with a mean of 69.2 inches and a standard deviation of 2.9 inches. A study participant is randomly selected. Find P80, the 80th percentile Find P50, the 50th percentile Find the height that corresponds to the first quartile please show all steps using excel formulas
Suppose that a category of world class runners are known to run a marathon (26 miles) in an average of 146 minutes with a standard deviation of 16 minutesConsider 49 of the races Find the probabillity that the average of the sample will be between 144 and 146 min in the 49 marathons B find the 80th percentile for the average of these 49 marathons C find the median
To qualify for a medical study, an applicant must have systolic blood pressure in the 60% of the middle range. If the systolic blood pressure is normally distributed with a mean of 120 and a standard deviation of 4, find the upper and lower limits of blood pressure a person must have to qualify for the study.
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