Suppose that it is known that the population standard deviation is 40. if you wish to...
Suppose that it is known that the population standard deviation is 40. if you wish to estimate the population mean using a 95% C.I estimate with a margin of error ± 2.5. what sample size will be required?
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Suppose that it is known that the population standard deviation
is 40. if you wish to...
3 Suppose that a population is being studied that has a known standard deviation of 110....
3 Suppose that a population is being studied that has a known standard deviation of 110. Further suppose a sample of size 90 is taken, resulting in a sample mean of 550. Determine the Point Estimate and the Margin of Error for a 95% Confidence Interval for this sample. Round all calculations to two (2) decimal places. 6 Blank # 1 550 A/ Blank # 2 Question 2 (4 points) Saved Suppose that a population is being studied that has...
Consider a population having a standard deviation equal to 9.96. We wish to estimate the mean...
Consider a population having a standard deviation equal to 9.96. We wish to estimate the mean of this population. (a) How large a random sample is needed to construct a 95% confidence interval for the mean of this population with a margin of error equal to 1? (Round your answer to the next whole number.) The random sample is units. (b) Suppose that we now take a random sample of the size we have determined in part a. If we...
2. A population is known to have a standard deviation of 26.1. A sample space of...
2. A population is known to have a standard deviation of 26.1. A sample space of 35 items has a mean of (1 point) 562. Construct a 90% confidence interval estimate of the mean of the population. 0566<p<558 0555<pバ569 O 551<H573 0561<p<563 3. While researching the cost of school lunches per week across the state, you use a sample size of 45(point) weekly lunch prices. The standard deviation is known to be 68 cents. In order to be 90% confident,...
Suppose your marketing colleague used a known population mean and standard deviation to compute the standard...
Suppose your marketing colleague used a known population mean and standard deviation to compute the standard error as 56.4 for samples of a particular size. You don't know the particular sample size but your colleague told you that the sample size is greater than 70. Your boss asks what the standard error would be if you triple the sample size. What is the standard error for the new sample size? Please round your answer to the nearest tenth.
Suppose your marketing colleague used a known population mean and standard deviation to compute the standard...
Suppose your marketing colleague used a known population mean and standard deviation to compute the standard error as 49.6 for samples of a particular size. You don't know the particular sample size but your colleague told you that the sample size is greater than 60. Your boss asks what the standard error would be if you double the sample size. What is the standard error for the new sample size? Please round your answer to the nearest tenth.
2 points It is known that the population standard deviation of students' debts is 11800 NIS....
2 points It is known that the population standard deviation of students' debts is 11800 NIS. What is the minimum sample size should be selected so that the estimate at 95% confidence is within 800 NIS of the population mean? Your answer Given the sample: 15 18 30 40 40 44 50 50 Find the third quartile. * 2 points Your answer 2 points It is known that the population standard deviation of students' debts is 11800 NIS. What is...
6. A sample of size n- 200 has a known population standard deviation of 15.0. The...
6. A sample of size n- 200 has a known population standard deviation of 15.0. The population appears to be skewed. Determine whether a margin of error should be calculated using a critical value of za, a critical value of ta/2, or neither. Oa critical value of ta2 O a critical value of za O neither 7. The mean of a sample size n 35 is 1860. The standard deviation of the sample is 102 and the population is normally...
Suppose that you are wanting to estimate the mean of a population in which the standard...
Suppose that you are wanting to estimate the mean of a
population in which the standard deviation,
, is known to be 5. You take a random sample of size n=50 from the
population and determine that the mean of the sample is 22.4.
a. What is the standard error (of the mean) to two decimal
places?
b. If you wanted 94% confidence in your results, then what would
be the maximum allowable error (error of the estimate), E, to...
A population has a mean of 400 and a standard deviation of 40. Suppose a sample...
A population has a mean of 400 and a standard deviation of 40. Suppose a sample of size 125 is selected and x is used to estimate μ. a. What is the probability that the sample mean will be within +/- 9 of the population mean (to 4 decimals)? b. What is the probability that the sample mean will be within +/- 10 of the population mean (to 4 decimals)?
Suppose that a simple random sample is taken from a normal population having a standard deviation...
Suppose that a simple random sample is taken from a normal population having a standard deviation of 11 for the purpose of obtaining a 95% confidence interval for the mean of the population. a. If the sample size is 16, obtain the margin of error. b. Repeat part (a) for a sample size of 81. a. The margin of error for a sample size of 16 is ??? (Round to two decimal places as needed.) b. The margin of error...
3 Suppose that a population is being studied that has a known standard deviation of 110. Further suppose a sample of size 90 is taken, resulting in a sample mean of 550. Determine the Point Estimate and the Margin of Error for a 95% Confidence Interval for this sample. Round all calculations to two (2) decimal places. 6 Blank # 1 550 A/ Blank # 2 Question 2 (4 points) Saved Suppose that a population is being studied that has...
Consider a population having a standard deviation equal to 9.96. We wish to estimate the mean of this population. (a) How large a random sample is needed to construct a 95% confidence interval for the mean of this population with a margin of error equal to 1? (Round your answer to the next whole number.) The random sample is units. (b) Suppose that we now take a random sample of the size we have determined in part a. If we...
2. A population is known to have a standard deviation of 26.1. A sample space of 35 items has a mean of (1 point) 562. Construct a 90% confidence interval estimate of the mean of the population. 0566<p<558 0555<pバ569 O 551<H573 0561<p<563 3. While researching the cost of school lunches per week across the state, you use a sample size of 45(point) weekly lunch prices. The standard deviation is known to be 68 cents. In order to be 90% confident,...
2 points It is known that the population standard deviation of students' debts is 11800 NIS. What is the minimum sample size should be selected so that the estimate at 95% confidence is within 800 NIS of the population mean? Your answer Given the sample: 15 18 30 40 40 44 50 50 Find the third quartile. * 2 points Your answer 2 points It is known that the population standard deviation of students' debts is 11800 NIS. What is...
6. A sample of size n- 200 has a known population standard deviation of 15.0. The population appears to be skewed. Determine whether a margin of error should be calculated using a critical value of za, a critical value of ta/2, or neither. Oa critical value of ta2 O a critical value of za O neither 7. The mean of a sample size n 35 is 1860. The standard deviation of the sample is 102 and the population is normally...
Suppose that you are wanting to estimate the mean of a
population in which the standard deviation,
, is known to be 5. You take a random sample of size n=50 from the
population and determine that the mean of the sample is 22.4.
a. What is the standard error (of the mean) to two decimal
places?
b. If you wanted 94% confidence in your results, then what would
be the maximum allowable error (error of the estimate), E, to...
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