Suppose that the known standard deviation for the population is 19. What sample size is necessary to have a standard error of 2.8?
Suppose that the known standard deviation for the population is 19. What sample size is necessary...
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?
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...
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 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.
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 the standard deviation of a normal population is known to be 3, and Ho asserts that the mean is equal to 12. A random sample of size 36 drawn from the population yields a sample mean 12.95. What is the p-value if the alternative hypothesis says that the population mean is not 12?
Suppose a population has a standard deviation of 6. You draw a random sample of size 97 and test the null hypothesis that the population mean is 95. If the true population mean is 97, what is the probability of making a Type 2 error? How large a sample size would you need to have power of 80% in a one-sided test?
If selecting samples of size n≤30 from a population with a known mean and standard deviation, what requirement, if any, must be satisfied in order to assume that the distribution of the sample means is a normal distribution? A) The population must have a normal distribution. B) The population must have a mean of 1. C) The population must have a standard deviation of 1. D) None; the distribution of sample means will be approximately normal.
It is known that the population standard deviation for the IQ test is 14. What sample size would be needed to collect in order to calculate a 95% CI for the mean that is within 0.08 points? What sample size would be needed to collect in order to calculate a 98% CI for the mean that is within 1 point?
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...