A population is estimated to have a standard deviation of 10. We want to estimate the population mean within 2, with a 95% level of confidence. How large a sample is required?
a. 98 b. 97 c. 96 d. 95
A population is estimated to have a standard deviation of 10. We want to estimate the...
A population is estimated to have a standard deviation of 12. We want to estimate the population mean within 2, with a 95% level of confidence. How large a sample is required? (Round up your answer to the next whole number.)
A population is estimated to have a standard deviation of 12. We want to estimate the population mean within 2 with a 99 percent level of confidence. How large a sample is required?
We want to estimate the population mean within 21, with a 90% level of confidence. The population standard deviation is estimated to be 60. How large a sample is required?
Please use excel for work. 20. We want to estimate the population mean within 5, with a 99% level of confidence. The population standard deviation is estimated to be 15. How large a sample is required?
The standard IQ test has a mean of 101 and a standard deviation of 16. Determine the required sample size if we want to estimate the population mean with 98% confidence to within 4 IQ points of the true mean. D Question 11 1 pts The standard IQ test has a mean of 101 and a standard deviation of 16. Determine the required sample size if we want to estimate the population mean with 98% confidence to within 4 IQ...
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...
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=39.2. You would like to be 98% confident that your estimate is within 5 of the true population mean. How large of a sample size is required? n =
We want to estimate the mean weekly earnings of students at a particular college with 95% confidence. How many students must be randomly selected so that the sample mean is within $1 of the population mean? Population standard deviation is known to be $10.
QUESTION 1 In constructing a 95% confidence level estimate of the mean when the population standard deviation () is known what will be your score used in the formula? QUESTION 2 In constructing a 99% confidence level estimate of the mean when the population standard deviation (a) is known what will be your score used in the formula? HINT. Be sure to review page 236 "Finding Z scores from Known Areas - Special Cases and Tabel A-2. QUESTION 3 In...
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 21.3. You would like to be 95% confident that your estimate is within 5 of the true population mean. How large of a sample size is required?