12. A random sample of 64 items was taken and the following values computed: Sample Mean...
A simple random sample of 60 items resulted in a sample mean of 64. The population standard deviation is 12. a. Compute the 95% confidence interval for the population mean (to 1 decimal). ( , ) b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals). ( , )
A simple random sample of 60 items resulted in a sample mean of 91. The population standard deviation is 12. a. Compute the 95% confidence interval for the population mean (to 1 decimal). (______,_______)? b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals). (_______,_______)?
A simple random sample of 40 items resulted in a sample mean of 60. The population standard deviation is σ =20 . a. Compute the 95% confidence interval for the population mean. Round your answers to one decimal place. ( , ) b. Assume that the same sample mean was obtained from a sample of 130 items. Provide a 95% confidence interval for the population mean. Round your answers to two decimal places. ( , )
A simple random sample of 60 items resulted in a sample mean of 74. The population standard deviation is 14. a. Compute the 95% confidence interval for the population mean (to 1 decimal). ( , ) b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals). ( , )
A simple random sample of 60 items resulted in a sample mean of 84. The population standard deviation is 16. a. Compute the 95% confidence interval for the population mean (to 1 decimal). ( b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals). ( c. What is the effect of a larger sample size on the margin of error? Select Select It...
A simple random sample of 60 items resulted in a sample mean of 65. The population standard deviation is 17. a. Compute the 95% confidence interval for the population mean (to 1 decimal). ( , ) b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals). ( , ) c. What is the effect of a larger sample size on the margin of error? Select It increases...
Suppose a random sample of size 64 is selected from a population. The sample yields a mean of 26 and a standard deviation of 4. From this information, the 90% confidence interval to estimate the population mean can be computed to be _______.
A simple random sample of 64 observations was taken from a large population. The sample mean and the standard deviation were determined to be 70 and 12 respectively. The standard error of the mean is . . . (hint: enter the answer with one decimal place)
A simple random sample of 60 items resulted in a sample mean of 63. The population standard deviation is 17. a. Compute the 95% confidence interval for the population mean (to 1 decimal). O O b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals). O O O c. What is the effect of a larger sample size on the margin of error?...
A simple random sample of 60 items resulted in a sample mean of 73. The population standard deviation is 15. a. Compute the 95% confidence interval for the population mean (to 1 decimal). (____) , (____) b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals). (___) , (___) c. What is the effect of a larger sample size on the margin of...