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WBWK7: Problem 2 Previous Problem Problem List Next Problem (15 points) A random sample of 100...
Homework4: Problem 2 Previous Problem Problem List Next Problem (6 points) A random sample of 100...
Homework4: Problem 2 Previous Problem Problem List Next Problem (6 points) A random sample of 100 observations from a population with standard deviation 23.75 yielded a sample mean of 94.5. 1. Given that the null hypothesis is H = 90 and the alternative hypothesis is u > 90 using a = .05, find the following: (a) Test statistic = (b) P-value: (c) The conclusion for this test is: A. There is insufficient evidence to reject the null hypothesis B. Reject...
Previous Problem Problem List Next Problem (20 points) The hemoglobin count (HC) in grams per 100...
Previous Problem Problem List Next Problem (20 points) The hemoglobin count (HC) in grams per 100 milliliters of whole blood is approximately normally distributed with a population mean of 14 for healthy adult women. Suppose a particular female patient has had 17 laboratory blood tests during the past year. The sample readings showed an average HC of 17.98 with a standard deviation of 2.52. Does it appear that the population average HC for this patient is not 147 (a) State...
Homework4: Problem 8 Previous Problem Problem List Next Problem The observations from a random sample of n 6 from a...
Homework4: Problem 8 Previous Problem Problem List Next Problem The observations from a random sample of n 6 from a normal population are: 10.47, 12.67, 11.18, 12.18, 12.81, 13.13. <13. Use a 5% level of Test the null hypothesis of H : = 13 against the alternative hypothesis of H u significance. Answer the following, rounding off your answer to three decimal places. (a) What is the sample mean? (b) What is the sample standard deviation? (c) What is the...
Previous Problem List Next (1 point) A random sample of elementary school children in New York...
Previous Problem List Next (1 point) A random sample of elementary school children in New York state is to be selected to estimate the proportion p who have received a medical examination during the past year. It is desired that the sample proportion be within 0.015 of the true proportion with a 98% level of confidence (a) Assuming no prior information about p is available, approximately how large of a sample size is needed? Don't forget to round up. (b)...
Problem 3. (17 points A random sample of 80 in-coming college freshmen showed that were planning...
Problem 3. (17 points A random sample of 80 in-coming college freshmen showed that were planning to bring a car with them to campus next fail. Suppose that we are interested informing a confidence interval at 90 percent for the proportion of all incoming college freshmen who are planning to bring a car to campus next fall Where appropriate, express your wer a proportion not a percentage. Round answers to three decimal places The estimates The standard errors The mutipli...
HW4 Binomial Random Variables: Problem 3 Previous Problem Problem List Next Problem (1 point) A man...
HW4 Binomial Random Variables: Problem 3 Previous Problem Problem List Next Problem (1 point) A man claims to have extrasensory perception (ESP) As a test, a fair coin is fipped 27 times, and the man is asked to predict the outcome in advance. He gets 19 out of 27 correct. What is the probability that he would have done at least this well if he had no ESP? Probability
Problem 4. (17 points) A random sample of n = 80 in-coming college freshmen showed that...
Problem 4. (17 points) A random sample of n = 80 in-coming college freshmen showed that 28 were planning to bring a car with them to campus next fall. Suppose that we are interested in forming a confidence interval at 99.7 percent for the proportion of all in-coming college freshmen who are planning to bring a car to campus next fall. Where appropriate, express your answer as a proportion (not a percentage). Round answers to three decimal places. (a) The...
Previous Problem Problem List Next Problem (4 points) A spotlight on the ground is shining on...
Previous Problem Problem List Next Problem (4 points) A spotlight on the ground is shining on a wall 20m away. If a woman 2m tall walks from the spotlight toward the building at a speed of 0.6m/s, how fast is the length of her shadow on the building decreasing when she is 6m from the building? Answer (in meters per second) 23.94
Previous Problem Problem List Next Problem (1 point) In 2012, the percentage of cell phone owners...
Previous Problem Problem List Next Problem (1 point) In 2012, the percentage of cell phone owners who used their cell phone to send or receive text messages was 80 %. A polling firm contacted a simple random sample of 1300 people chosen from the population of cell phone owners. If p is the proportion of cell phone owners the mean for p who used their phone to text, then what was 0.011 Submit Answers Preview My Answers You have attempted...
ne Sample Hypothesis Tests: Problem 7 Previous Problem List Next (1 point) An article in the...
ne Sample Hypothesis Tests: Problem 7 Previous Problem List Next (1 point) An article in the Washington Post stated that nearty 45 percent of all Americans take a daily medication. A random sample of n -82 people in Georgia found 30 who take a daily medication. Use this information to test the hypotheses Ho : p = .45 where p represents the population proportion of Georgians who take a daily medication. (a) What is the value of the sample proportion...
Homework4: Problem 2 Previous Problem Problem List Next Problem (6 points) A random sample of 100 observations from a population with standard deviation 23.75 yielded a sample mean of 94.5. 1. Given that the null hypothesis is H = 90 and the alternative hypothesis is u > 90 using a = .05, find the following: (a) Test statistic = (b) P-value: (c) The conclusion for this test is: A. There is insufficient evidence to reject the null hypothesis B. Reject...
Previous Problem Problem List Next Problem (20 points) The hemoglobin count (HC) in grams per 100 milliliters of whole blood is approximately normally distributed with a population mean of 14 for healthy adult women. Suppose a particular female patient has had 17 laboratory blood tests during the past year. The sample readings showed an average HC of 17.98 with a standard deviation of 2.52. Does it appear that the population average HC for this patient is not 147 (a) State...
Homework4: Problem 8 Previous Problem Problem List Next Problem The observations from a random sample of n 6 from a normal population are: 10.47, 12.67, 11.18, 12.18, 12.81, 13.13. <13. Use a 5% level of Test the null hypothesis of H : = 13 against the alternative hypothesis of H u significance. Answer the following, rounding off your answer to three decimal places. (a) What is the sample mean? (b) What is the sample standard deviation? (c) What is the...
Previous Problem List Next (1 point) A random sample of elementary school children in New York state is to be selected to estimate the proportion p who have received a medical examination during the past year. It is desired that the sample proportion be within 0.015 of the true proportion with a 98% level of confidence (a) Assuming no prior information about p is available, approximately how large of a sample size is needed? Don't forget to round up. (b)...
Problem 3. (17 points A random sample of 80 in-coming college freshmen showed that were planning to bring a car with them to campus next fail. Suppose that we are interested informing a confidence interval at 90 percent for the proportion of all incoming college freshmen who are planning to bring a car to campus next fall Where appropriate, express your wer a proportion not a percentage. Round answers to three decimal places The estimates The standard errors The mutipli...
HW4 Binomial Random Variables: Problem 3 Previous Problem Problem List Next Problem (1 point) A man claims to have extrasensory perception (ESP) As a test, a fair coin is fipped 27 times, and the man is asked to predict the outcome in advance. He gets 19 out of 27 correct. What is the probability that he would have done at least this well if he had no ESP? Probability
Problem 4. (17 points) A random sample of n = 80 in-coming college freshmen showed that 28 were planning to bring a car with them to campus next fall. Suppose that we are interested in forming a confidence interval at 99.7 percent for the proportion of all in-coming college freshmen who are planning to bring a car to campus next fall. Where appropriate, express your answer as a proportion (not a percentage). Round answers to three decimal places. (a) The...
Previous Problem Problem List Next Problem (4 points) A spotlight on the ground is shining on a wall 20m away. If a woman 2m tall walks from the spotlight toward the building at a speed of 0.6m/s, how fast is the length of her shadow on the building decreasing when she is 6m from the building? Answer (in meters per second) 23.94
Previous Problem Problem List Next Problem (1 point) In 2012, the percentage of cell phone owners who used their cell phone to send or receive text messages was 80 %. A polling firm contacted a simple random sample of 1300 people chosen from the population of cell phone owners. If p is the proportion of cell phone owners the mean for p who used their phone to text, then what was 0.011 Submit Answers Preview My Answers You have attempted...
ne Sample Hypothesis Tests: Problem 7 Previous Problem List Next (1 point) An article in the Washington Post stated that nearty 45 percent of all Americans take a daily medication. A random sample of n -82 people in Georgia found 30 who take a daily medication. Use this information to test the hypotheses Ho : p = .45 where p represents the population proportion of Georgians who take a daily medication. (a) What is the value of the sample proportion...
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