A botanist measures the heights of a sample of 24 seedlings and obtains a mean of...
A botanist measures the heights of a sample of 24 seedlings and obtains a mean of 41.6 cm and a standard deviation of 4.8 cm. Construct the 98% confidence interval for the population mean height.
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A botanist measures the heights of a sample of 24 seedlings and
obtains a mean of...
answers and explanations A botanist measures the heights of 25 seedlings and obtains a mean of...
answers and explanations
A botanist measures the heights of 25 seedlings and obtains a mean of 41.6 cm and standard deviation of 4.8 cm. 9. What is the best point estimate for the population mean? 10. Construct a 98% confidence interval for the population mean. 11. Construct a 95% confidence interval for the population standard deviation.
[15 pts] Ukojaftor is the manager of a tree nursery. He measures the heights of 39...
[15 pts] Ukojaftor is the manager of a tree nursery. He measures the heights of 39 seedlings and obtains a mean of 58.5 cm with a standard deviation of 4.3 cm. a) Construct a 95% confidence interval for these sample seedlings. b) Find the margin of error for the 95% confidence interval for the mean heights of all trees seedlings. c) |Use information from part a to fill in the following sentence: of all samples of size have sample means...
A sample of 18 tree heights gave a sample mean of 20.3 m. Suppose the population...
A sample of 18 tree heights gave a sample mean of 20.3 m. Suppose the population standard deviation is 7.0 m Construct a 99% confidence interval for the population mean tree height. We can assume that the tree heights are normally distributed. Round to one digit after the decimal point. Answer: We are 99% confident that the true population mean tree height lies somewhere between metres and D3 metres.
A sample of 21 tree heights gave a sample mean of 26.1 m. Suppose the population...
A sample of 21 tree heights gave a sample mean of 26.1 m. Suppose the population standard deviation is 6.2 m. Construct a 80% confidence interval for the population mean tree height. We can assume that the tree heights are normally distributed. Round to one digit after the decimal point. Answer: We are 80% confident that the true population mean tree height lies somewhere between metres and metres.
A sample of 14 tree heights gave a sample mean of 21.5 m. Suppose the population...
A sample of 14 tree heights gave a sample mean of 21.5 m. Suppose the population standard deviation is 5.8 m. Construct a 99% confidence interval for the population mean tree height. We can assume that the tree heights are normally distributed. Round to one digit after the decimal point. Answer: We are 99% confident that the true population mean tree height lies somewhere between metres and 3 metres.
3) [20 pts] Carbon monoxide (CO) emissions for cars vary with mean 2.9 gm/mi and standard...
3) [20 pts] Carbon monoxide (CO) emissions for cars vary with mean 2.9 gm/mi and standard deviation 0.4 gm/mi. The Ponaxtiruchiranalignim Car Rental Fleet has 10 of these cars in its fleet, acquired from various (i.e., random) sources. The CO emissions follow a normal distribution. a) What is the probability that a randomly selected car from the street has a CO emission greater than 3.1 gm/mi. b) What is the probability that a randomly selected car from the fleet has...
1. Use the confidence interval to find the estimated margin of error. Then find the sample...
1. Use the confidence interval to find the estimated margin of error. Then find the sample mean. A biologist reports a confidence interval of (4.0, 4.8) when estimating the mean height (in centimeters) of a sample of seedlings. 2. In a random sample of 26 people, the mean commute time to work was 32.2 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a t-distribution to construct a 80% confidence interval for the...
A student researcher compares the heights of men and women from the student body of a...
A student researcher compares the heights of men and women from the student body of a certain college in order to estimate the difference in their mean heights. A random sample of 12 men had a mean height of 70.7 inches with a standard deviation of 2.41 inches. A random sample of 17 women had a mean height of 62.7 inches with a standard deviation of 3.07 inches. Determine the 98 % confidence interval for the true mean difference between...
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 24 observations is used to estimate the population mean. The sample mean...
A random sample of 24 observations is used to estimate the population mean. The sample mean and the sample standard deviation are calculated as 128.4 and 26.80, respectively. Assume that the population is normally distributed. [You may find it useful to reference the t table.) a. Construct the 95% confidence interval for the population mean. (Round intermediate calculations to at least 4 decimal places. Round "t" value to 3 decimal places and final answers to 2 decimal places.) Confidence interval...
answers and explanations
A botanist measures the heights of 25 seedlings and obtains a mean of 41.6 cm and standard deviation of 4.8 cm. 9. What is the best point estimate for the population mean? 10. Construct a 98% confidence interval for the population mean. 11. Construct a 95% confidence interval for the population standard deviation.
[15 pts] Ukojaftor is the manager of a tree nursery. He measures the heights of 39 seedlings and obtains a mean of 58.5 cm with a standard deviation of 4.3 cm. a) Construct a 95% confidence interval for these sample seedlings. b) Find the margin of error for the 95% confidence interval for the mean heights of all trees seedlings. c) |Use information from part a to fill in the following sentence: of all samples of size have sample means...
A sample of 18 tree heights gave a sample mean of 20.3 m. Suppose the population standard deviation is 7.0 m Construct a 99% confidence interval for the population mean tree height. We can assume that the tree heights are normally distributed. Round to one digit after the decimal point. Answer: We are 99% confident that the true population mean tree height lies somewhere between metres and D3 metres.
A sample of 14 tree heights gave a sample mean of 21.5 m. Suppose the population standard deviation is 5.8 m. Construct a 99% confidence interval for the population mean tree height. We can assume that the tree heights are normally distributed. Round to one digit after the decimal point. Answer: We are 99% confident that the true population mean tree height lies somewhere between metres and 3 metres.
3) [20 pts] Carbon monoxide (CO) emissions for cars vary with mean 2.9 gm/mi and standard deviation 0.4 gm/mi. The Ponaxtiruchiranalignim Car Rental Fleet has 10 of these cars in its fleet, acquired from various (i.e., random) sources. The CO emissions follow a normal distribution. a) What is the probability that a randomly selected car from the street has a CO emission greater than 3.1 gm/mi. b) What is the probability that a randomly selected car from the fleet has...
A student researcher compares the heights of men and women from the student body of a certain college in order to estimate the difference in their mean heights. A random sample of 12 men had a mean height of 70.7 inches with a standard deviation of 2.41 inches. A random sample of 17 women had a mean height of 62.7 inches with a standard deviation of 3.07 inches. Determine the 98 % confidence interval for the true mean difference between...
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 24 observations is used to estimate the population mean. The sample mean and the sample standard deviation are calculated as 128.4 and 26.80, respectively. Assume that the population is normally distributed. [You may find it useful to reference the t table.) a. Construct the 95% confidence interval for the population mean. (Round intermediate calculations to at least 4 decimal places. Round "t" value to 3 decimal places and final answers to 2 decimal places.) Confidence interval...
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