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3. Suppose that the length of iron rods from a certain factory follows the normal distribution...
Lazurus Steel Corporation produces iron rods that are supposed to be inches long. The machine that...
Lazurus Steel Corporation produces iron rods that are supposed to be inches long. The machine that makes these rods does not produce each rod exactly inches long. The lengths of the rods vary slightly. It is known that when the machine is working properly, the mean length of the rods made on this machine is inches. The standard deviation of the lengths of all rods produced on this machine is always equal to inch. The quality control department takes a...
7.5 Suppose you draw a random sample of size n from a normal distribution with unknown...
7.5 Suppose you draw a random sample of size n from a normal distribution with unknown mean u and known standard deviation o and construct a 95% confidence interval for u. If you want to halve the margin of error, how much larger would the sample size have to be?
This Quiz: 22 pts possit Use the standard normal distribution or the t-distribution to construct a...
This Quiz: 22 pts possit Use the standard normal distribution or the t-distribution to construct a 99% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. In a random sample of 40 people, the mean body mass index (BMI) was 26.9 and the standard deviation was 6.03. O A. Use a normal distribution because the sample is random, the population is normal, and is known O B. Use a...
Use the standard normal distribution or the t-distribution to construct a 90% confidence interval for the...
Use the standard normal distribution or the t-distribution to construct a 90% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. In a random sample of 13 people, the mean length of stay at a hospital was 6.9 days. Assume the population standard deviation is 2.1 days and the lengths of stay are normally distributed. Which distribution should be used to construct the confidence interval? A. Use a normal...
Suppose that you give the SAT to a random sample of 1000 people from a large...
Suppose that you give the SAT to a random sample of 1000 people from a large population in which the scores have mean 1400 and it is known that the population standard deviation is 200. It is known that the distribution is approximately normal. (a) Construct a 95% confidence interval for the unknown mean of the SAT test. (b) Construct a 90% confidence interval for the unknown mean of the SAT test. (c) Construct a 92% confidence interval for the...
Use the standard nomal distribution or the distribution to construct a 95% confidence interval for the...
Use the standard nomal distribution or the distribution to construct a 95% confidence interval for the population mean. Justily your decisioni neither distribution can be used, explain why. Interpret the results In a random sample of 41 people, the mean body mass index (BMI) was 27.8 and the standard deviation was 6.11 Which distribution should be used to construct the confidence interval? Choose the correct answer below. O A Use a distribution because the sample is random, na 30, and...
1. A population of values follows a normal distribution with standard deviation 5 and unknown mean....
1. A population of values follows a normal distribution with standard deviation 5 and unknown mean. A random sample of size 16 has mean 24. a) Write what each number represents. b) Find and interpret the 95% CI for the unknown population mean. c) Is 30 a plausible population mean? Explain.
Use the standard normal distribution or the t distribution to construct a 9 % confidence interval...
Use the standard normal distribution or the t distribution to construct a 9 % confidence interval for the population mean Justify your decision if neither distribution can be used, explain why Interpret the results ln a random sample of 17 mortgage institutions, the mean interest rate was 3.69% and the standard deviation was 36% Assume the iterest rates are normally distributed Which distribution should be used to construct the confidence interval? ○ A. Use a t-distribution because it is a...
6.2.36-1 Question Help Use the standard normal distribution or the t-distribution to construct a 95% confidence...
6.2.36-1 Question Help Use the standard normal distribution or the t-distribution to construct a 95% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. In a random sample of 15 mortgage institutions, the mean interest rate was 3.42% and the standard deviation was 0.44%. Assume the interest rates are normally distributed Which distribution should be used to construct the confidence interval? O O O O O A. Use a...
Suppose that the distribution of IQ scores (X) of a group of school children follows the...
Suppose that the distribution of IQ scores (X) of a group of school children follows the normal distribution of with an unknown mean and an standard deviation z. A random sample of n=16 children from this population resulted in sample mean x=105 and sample standard deviation S=16. The Kolmogrov-Rao-Blackwell-Pathak estimator of the proportion population with an IQ of at most 111 is: A: 0.671 B: 0.693 C: 0.648 D: 0.715 E: 0.624
7.5 Suppose you draw a random sample of size n from a normal distribution with unknown mean u and known standard deviation o and construct a 95% confidence interval for u. If you want to halve the margin of error, how much larger would the sample size have to be?
This Quiz: 22 pts possit Use the standard normal distribution or the t-distribution to construct a 99% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. In a random sample of 40 people, the mean body mass index (BMI) was 26.9 and the standard deviation was 6.03. O A. Use a normal distribution because the sample is random, the population is normal, and is known O B. Use a...
Use the standard nomal distribution or the distribution to construct a 95% confidence interval for the population mean. Justily your decisioni neither distribution can be used, explain why. Interpret the results In a random sample of 41 people, the mean body mass index (BMI) was 27.8 and the standard deviation was 6.11 Which distribution should be used to construct the confidence interval? Choose the correct answer below. O A Use a distribution because the sample is random, na 30, and...
1. A population of values follows a normal distribution with standard deviation 5 and unknown mean. A random sample of size 16 has mean 24. a) Write what each number represents. b) Find and interpret the 95% CI for the unknown population mean. c) Is 30 a plausible population mean? Explain.
Use the standard normal distribution or the t distribution to construct a 9 % confidence interval for the population mean Justify your decision if neither distribution can be used, explain why Interpret the results ln a random sample of 17 mortgage institutions, the mean interest rate was 3.69% and the standard deviation was 36% Assume the iterest rates are normally distributed Which distribution should be used to construct the confidence interval? ○ A. Use a t-distribution because it is a...
6.2.36-1 Question Help Use the standard normal distribution or the t-distribution to construct a 95% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. In a random sample of 15 mortgage institutions, the mean interest rate was 3.42% and the standard deviation was 0.44%. Assume the interest rates are normally distributed Which distribution should be used to construct the confidence interval? O O O O O A. Use a...
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