Standard error of mean
=0.8
QUESTION 23 A sample of 100 information systems managers had an average hourly income of $40.00...
A sample of 100 information systems managers had an average hourly income of $40.00 with a standard deviation of $8.00. The value of the margin of error at 95% confidence is a. 1.568. b. 8. C. 80. d. .10.
A sample of 23 information system managers had an average hourly income of $40.75 with a standard deviation of $7.00. Develop a 95% confidence interval estimate for the average hourly wage of all information system managers. a. Critical value for the confidence interval = b. At 95% confidence, what is the margin of error c. upper and lower limit
) You have collected 14,925 observations from the Current Population Survey. There are 6,285 females in the sample, and 8,640 males. The females report a mean of average hourly earnings of $16.50 with a standard deviation of $9.06. The males have an average of $20.09 and a standard deviation of $10.85. The overall mean average hourly earnings is $18.58. a. Using the t-statistic for testing differences between two means (section 3.4 of your textbook), decide whether or not there is...
An SRS of 55 lawyers from Reno, Nevada had a mean hourly salary of x= $310 and standard deviation s- $75 a. construct a 95% confidence interval for the mean hourly salary of all Reno lawyers b.find the margin of error in part a c. how large a sample would be necessary to have a margin of error of $25 with a 95% confidence level?
Question text P1. A random sample was taken from 100 individuals to whom the blood glucose level was measured, obtaining a sample mean of 110 mg / cc. The population standard deviation is known to be 20 mg / cc. to. Estimate the standard error for the sample average. (5 pts) b. Calculate the error if a confidence interval for the mean is to be constructed with 90% confidence. (5 pts) c. Build the confidence interval for the average or...
In order to estimate the difference between the average yearly salaries of top managers in private and governmental organizations, the following information was gathered Private Governmental 50 90 Sample Size Sample Mean (in $1,000s) Sample Standard Deviation (in S1,000s) 60 80 Develop an interval estimate for the difference between the average salaries of the two sectors. Let α,05.
One college class had a total of 90 students. The average score for the class on the last exam was 86.3 with a standard deviation of 4.4. A random sample of 39 students was selected. a. Calculate the standard error of the mean. b. What is the probability that the sample mean will be less than 88? c. What is the probability that the sample mean will be more than 87? d. What is the probability that the sample mean...
A study of the career paths of hotel general managers sent questionnaires to a random sample of 97 hotels belonging to major U.S. hotel chains. The average time these 97 general managers had spent with their current company was 12.75 years. (Take it as known that the standard deviation of time with the company for all general managers is 1.8 years.) (a) Find the bound for an 80% confidence interval to estimate the mean time a general manager had spent...
QUESTION 23 4 points Problem 23) For a project that investigates the average weight difference by gender of patients from the Mayo clinic, the researcher collected a sample of 64 male patients and another sample of 36 female patients. The researcher then cakulated the sample mean of male patients as 160 lbs with a sample standard deviation of 20 lbs, and the sample mean of female patients as 140 lbs with a sample standard deviation of 10 lbs. Test the...
The following probability distributions of job satisfaction scores for a sample of information systems (IS) senior executives and middle managers range from a low of 1 (very dissatisfied) to a high of 5 (very satisfied). Job Satisfaction Score Probability IS Senior Executives IS Middle Managers 1 0.05 0.04 2 0.09 0.10 3 0.03 0.13 4 0.42 0.45 5 0.41 0.28 (a) What is the expected value of the job satisfaction score for senior executives? (b) What is the expected value...