A paleontologist examines 32 skeletons of a new species of dinosaur and finds that the average...
A paleontologist examines 32 skeletons of a new species of dinosaur and finds that the average length of the right femur is 80 cm, with a standard deviation of 8cm.
A. Does this involve z- values or t- values?
B. Estimate the population mean with 90% confidence
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A paleontologist examines 32 skeletons of a new species of
dinosaur and finds that the average...
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the...
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 39.1 for a sample of size 22 and standard deviation 19.1. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 80% confidence level). Assume the data is from a normally distributed population. Enter your answer as a tri-linear inequality accurate to three decimal places. afe Assume that a sample is used to...
1/The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the...
1/The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 56.7 for a sample of size 664 and standard deviation 11.2. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 95% confidence level). Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). ( 65.6742 ) < μμ <(68.3258...
Question:The average cost per night of a hotel room in New York City is $472. Assume...
Question:The average cost per night of a hotel room in New York City is $472. Assume this estimate is based on a sample of 75 hotels and that the sample standard deviation is $54. a. At 90% confidence, what is the interval estimate for the population mean? b. At 95% confidence, what is the interval estimate for the population mean? c. At 99% confidence, what is the interval estimate for the population mean? d. Describe the effect of a higher...
An ecologist randomly samples 20 plants of a specific species and measures their heights. He finds...
An ecologist randomly samples 20 plants of a specific species and measures their heights. He finds that this sample has a mean of 13 cm and a standard deviation of 3 cm. If we assume that the height measurements are normally distributed, find a 95% confidence interval for the height of all plants of this species. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place (if necessary,...
A random sample of 85 students finds that they, on average, they get 6.5 hours of...
A random sample of 85 students finds that they, on average, they get 6.5 hours of sleep a night, with a sample standard deviation of 7 hours. Would you use the z-distribution or the t-distribution to construct a confidence interval? How do you know? Construct a 95% confidence interval for the population mean. How do you interpret this interval? Is it likely that students actually get 7 hours of sleep a night? How can you tell?
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the...
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 68.1 for a sample of size 23 and standard deviation 12.1. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 90% confidence level). Assume the data is from a normally distributed population. Enter your answer as a tri-linear inequality accurate to three decimal places. <<
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the...
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 45.6 for a sample of size 21 and standard deviation 6.7. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 90% confidence level). Assume the data is from a normally distributed population Enter your answer as a tri-linear inequality accurate to three decimal places. <<
The effectiveness of a blood pressure drug is being investigated. An experimenter finds that, on average,...
The effectiveness of a blood pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 19.4 for a sample of size 27 and standard deviation 20.7. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 80% confidence level). Assume the data is from a normally distributed population. Enter your answer as a tri-linear inequality accurate to three decimal places.
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the...
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 72.4 mmHg (millimeters of mercury) for a sample of size 258 and a sample standard deviation 16.1 mmHg. How much of mmHg will lower for a typical patient's systolic blood pressure after taking the drug? Estimate with a 99% confidence. Preliminary: Is it safe to assume that n≤5% of all patients with a systolic blood pressure? No Yes...
The manager of a pizza chain in Albuquerque, New Mexico, wants to determine the average size...
The manager of a pizza chain in Albuquerque, New Mexico, wants to determine the average size of their advertised 20-inch pizzas. She takes a random sample of 30 pizzas and records their mean and standard deviation as 20.50 inches and 2.10 inches, respectively. She subsequently computes the 90% confidence interval of the mean size of all pizzas as [19.87, 21.13]. However, she finds this interval to be too broad to implement quality control and decides to reestimate the mean based...
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 39.1 for a sample of size 22 and standard deviation 19.1. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 80% confidence level). Assume the data is from a normally distributed population. Enter your answer as a tri-linear inequality accurate to three decimal places. afe Assume that a sample is used to...
An ecologist randomly samples 20 plants of a specific species and measures their heights. He finds that this sample has a mean of 13 cm and a standard deviation of 3 cm. If we assume that the height measurements are normally distributed, find a 95% confidence interval for the height of all plants of this species. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place (if necessary,...
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 68.1 for a sample of size 23 and standard deviation 12.1. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 90% confidence level). Assume the data is from a normally distributed population. Enter your answer as a tri-linear inequality accurate to three decimal places. <<
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 45.6 for a sample of size 21 and standard deviation 6.7. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 90% confidence level). Assume the data is from a normally distributed population Enter your answer as a tri-linear inequality accurate to three decimal places. <<
The effectiveness of a blood pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 19.4 for a sample of size 27 and standard deviation 20.7. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 80% confidence level). Assume the data is from a normally distributed population. Enter your answer as a tri-linear inequality accurate to three decimal places.
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