Suppose that the lengths of human pregnancies are normally distributed with a mean of 267 days and a standard deviation of 16 days. Complete the followingstatements.(a) Approximately ?of pregnancies have lengths between 219 days and315 days.(b) Approximately 95% of pregnancies have lengths between I days and days.

Answered: Image /qna-images/answer/ce050671-9594-4037-ac9b-8fa8027e5f83.jpg

Answered: Suppose that the lengths of human…

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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Is the difference between the mean annual salaries of registered nurses in State A and State B equal to $10,500? To decide, you select a random sample of registered nurses from each state. The results of each survey are shown. Assume the population standard deviations are o, $8337 and o, = $7633. At a = 0.01, what can you conclude? Registered Nurses in State A Registered Nurses in State B X1 75,695 70,695 %3D %3D X2 30 n2 25 What are the null and alternative hypotheses for this test? O A. Ho: H1 - H22 10,500 Ha: H1 - H2 10,500 Ha: H1 - H25 10,500 O F. Ho: H1 - H2s 10,500 Ha: H1 - H2 > 10,500 Determine the critical value(s). Zo = (Round to three decimal places as needed. Use a comma to separate answers as needed.)
The following table shows the number of people that are either 18, 19, 20 or 21 years old, from a sample of 258 people. a) Complete the table. Age Number of people 18 54 19 69 20 70 21 (b Find the mean for this sample. Give your answer to at least 2 decimal places. (c Find the standard deviation for this sample. Give your answer to at least 2 decimal places.
n a school district, all sixth grade students take the same standardized test. The superintendant of the school district takes a random sample of 21 scores from all of the students who took the test. She sees that the mean score is 128 with a standard deviation of 41.4416. The superintendant wants to know if the standard deviation has changed this year. Previously, the population standard deviation was 25. Is there evidence that the standard deviation of test scores has increased at the α=0.005 level? Assume the population is normally distributed. Step 1 of 5 : State the null and alternative hypotheses. Round to four decimal places when necessary.
The table below summarizes the number of hours a sample of college students spent watching television in the past week. Hours Frequency 10 - 12 4 13 - 15 12 16 - 18 20 19 - 21 14 Find the standard deviation.
The following table shows the number of people that have either 0, 1, 2 or 3 cars registered in their name from a sample of 166 people. Complete the table. xx CountCount 0 45 1 43 2 32 3 46 Find the mean number of cars owned for this sample. Give your answer to at least 2 decimal places. Find the standard deviation of cars owned for this sample. Give your answer to at least 2 decimal places.
The following table shows the number of people that are either 18, 19, 20 or 21 years old, from a sample of 267 people. a) Complete the table. Age Number of people 18 62 19 67 20 75 21 (b Find the mean for this sample. Give your answer to at least 2 decimal places. (c Find the standard deviation for this sample. Give your answer to at least 2 decimal places.
Business Weekly conducted a survey of graduates from 30 top MBA programs. On the basis of the survey, assume the mean annual salary for graduates 10 years after graduation is $136,000. Assume the standard deviation is $39,000. Suppose you take a simple random sample of 9 graduates. Round all answers to four decimal places if necessary.
Is the difference between the mean annual salaries of registered nurses in State A and State B equal to $10,500? To decide, you select a random sample of registered nurses from each state. The results of each survey are shown. Assume the population standard deviations are o, = $8337 and o, = $7633. At a = 0.01, what can you conclude? Registered Nurses in State A Registered Nurses in State B 75,695 70,695 %3D %3D X1 X2 n1 30 n2 25 What are the null and alternative hypotheses for this test? A. Ho: H1 - H22 10,500 Ha: H1 - H2 10,500 Ha: H1 - H2s 10,500 O F. Ho: H1 - H2 S 10,500 Hai H1 - H2 > 10,500 Determine the critical value(s). (Round to three decimal places as needed. Use a comma to separate answers as needed.)
The table below gives the number of hours spent watching TV last week by a sample of 24 children. 31 28 60 63 33 75 73 87 46 82 70 50 47 50 39 83 25 73 33 74 87 85 97 12 Range = Standard Deviation =
The following data represent the number of people aged 25 to 64 years covered by health insurance (private or government) in 2018. Approximate the mean and standard deviation for age. Age Number (millions) 25-34 35-44 45-54 55-64 23.2 36.4 35.4 21.6 (Type an integer or decimal rounded to two decimal places as needed.) (Type an integer or decimal rounded to two decimal places as needed.)
Dan is doing research on organic farming for an agricultural foundation. He has collected data on the number of oranges harvested from individual trees in two different orchards. In each orchard, the number of oranges harvested from each of 57 trees was recorded. The histograms below show the distributions of the two data sets. The means and standard deviations for the data sets are also given. Orchard 1 Orchard 2 25 25 20- 20- 15+ 15- 10+ 10+ 5+ 5+ 199.5 219.5 239.5 259.5 279.5 299.5 319.5 339.5 359.5 199.5 219.5 239.5 259.5 279.5 299.5 319.5 339.5 359.5 Orchard 1 mean: 275.1 oranges Orchard 2 mean: 274.9 oranges Orchard 1 standard deviation: 23.2 oranges Orchard 2 standard deviation: 47.9 oranges Dan wants to use the Empirical Rule to make some approximations about both data sets. Unfortunately, it is appropriate to use the Empirical Rule on only one of them! Answer the parts below to help Dan with his approximations. (a) Identify the data set for which it is appropriate to use the…

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