True or False. Both the formula used to calculate minimum sample size for means and the...
True or False. Both the formula used to calculate minimum sample size for means and the one used for proportions, require the use of a desired margin of error value.
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Both the formula used to calculate minimum sample size for means and the one used for proportions, require the use of a desired margin of error value.
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True or False. Both the formula used to calculate minimum sample
size for means and the...
Which of the following statements are true? Note that there may be more than one correct...
Which of the following statements are true? Note that there may be more than one correct answer; select all that are true. In order for the inference procedures for proportions to be valid, the population from which the random sample is drawn must be normally distributed. As the desired margin of error decreases, then the required minimum sample size will increase. When determining the minimum sample size, if the value of p^ is not given, we should use the "worst-case...
A) Sample of size 15 is taken from among a population of egrets and used to...
A) Sample of size 15 is taken from among a population of egrets and used to calculate a 99% confidence interval for the true average wingspan in the population. Suppose the sample standard deviation is calculated to be s =6.2. What is the margin of error for the confidence interval? Round your answer to 3 decimal places. B) Suppose you are asked to construct a 99% confidence interval for an unknown population mean μ. The population standard deviation is unknown...
Question 16 (1 point) A t-test equation can be used to estimate sample size and power? O 1) True ...
Question 16 (1 point) A t-test equation can be used to estimate sample size and power? O 1) True O 2) False Save Question 17 (1 point) The standard error the mean is not used in independent t tests? O 1) True O 2) False Save Question 18 (1 point) Before you determine the p-value of an independent t test you should first determine if the variances are equal. You havea greater chance of rejecting the null if the variances...
What is the minimum sample size required to estimate a population mean with 90% confidence if...
What is the minimum sample size required to estimate a population mean with 90% confidence if the population standard deviation is estimated to be 30 and the desired margin of error is 2?
Answer the following True or False: Suppose a sample size of 87 was used to conduct...
Answer the following True or False: Suppose a sample size of 87 was used to conduct a right tailed hypothesis test for a single population mean. The null hypothesis was H0: μμ = 45 and the sample mean was 50 and the p-value was 0.03. Then there is a 3% chance that 87 randomly selected individuals from a population with a mean of 45 and the same standard deviation would have a sample mean greater than 50. false true
True or False. (Determining sample size n for the purpose of estimating mean) For a specified...
True or False. (Determining sample size n for the purpose of estimating mean) For a specified sampling error (SE) and given population standard deviation, increase in the confidence level (1-alpha) will lead to a larger sample sizen. True False True or False The smaller the p-value associated with a test of hypothesis, the stronger the support for the research hypothesis. True False
For the following scenarios, please tell me what the minimum sample size needed is, rounded up...
For the following scenarios, please tell me what the minimum sample size needed is, rounded up to the nearest integer (e.g., if your answer is 51.3, round it up to 52). Remember that you cannot survey a fraction of a person – it has to be a whole person. If you round down, then you won’t have the minimum amount of precision needed, so you must round up. For the z-scores, refer to table provided Confidence Level z-score 90% 1.65...
True or false: Suppose a sample size of 103 was used to conduct a left tailed...
True or false: Suppose a sample size of 103 was used to conduct a left tailed hypothesis test for a single population mean. The null hypothesis was H0: M= 22 and the p-value was 0.04. Then there is a 4% chance that the population mean is equal to 22.
1. Confidence Intervals are about the individual measurements, NOT the mean. True False 2. Means have...
1. Confidence Intervals are about the individual measurements, NOT the mean. True False 2. Means have smaller standard deviations than individuals. True or False 3. Paired t-methods are the same as one-sample t-methods applied to the pairwise differences. True or False 4. Pooled t-tests are best when the variances are unequal. True or False 5. Standard error (σ) is an estimate of the population standard deviation(s). True or False 6. The Central Limit Theorem (CLT) tells us that the mean...
Use the expression in the accompanying discussion of sample size to find the size of each...
Use the expression in the accompanying discussion of sample size to find the size of each sample if you want to estimate the difference between proportions of men and women who own smartphones. Assume that you want 90% confidence that your error is no more than 0.04. i Click the icon to view the discussion of sample size. The sample should include (Type whole numbers.) men and women. i Sample size discussion - X The sample size needed to estimate...
Question 16 (1 point) A t-test equation can be used to estimate sample size and power? O 1) True O 2) False Save Question 17 (1 point) The standard error the mean is not used in independent t tests? O 1) True O 2) False Save Question 18 (1 point) Before you determine the p-value of an independent t test you should first determine if the variances are equal. You havea greater chance of rejecting the null if the variances...
True or False. (Determining sample size n for the purpose of estimating mean) For a specified sampling error (SE) and given population standard deviation, increase in the confidence level (1-alpha) will lead to a larger sample sizen. True False True or False The smaller the p-value associated with a test of hypothesis, the stronger the support for the research hypothesis. True False
Use the expression in the accompanying discussion of sample size to find the size of each sample if you want to estimate the difference between proportions of men and women who own smartphones. Assume that you want 90% confidence that your error is no more than 0.04. i Click the icon to view the discussion of sample size. The sample should include (Type whole numbers.) men and women. i Sample size discussion - X The sample size needed to estimate...
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