Need help with Statistics problem for homework.
1. A high-tech company wants to estimate the mean number of years of college education its employees have completed. A sample of 15 employees had a mean of 4 years with a standard deviation of 0.7 years. Find a 95% confidence interval for the true mean.
Need help with Statistics problem for homework. 1. A high-tech company wants to estimate the mean...
A high-tech company wants to estimate the mean number of years of college education its employees have completed. A good estimate of the standard deviation for the number of years of college is 1.32. How large a sample needs to be taken to estimate u to within 0.57 of a year with 95% confidence? (Round you answer up to the nearest whole number.) You may need to use the appropriate table in Appendix B to answer this question.
Activity 9: Required sample sizes for hypothesis tests Sample size determination is the act of choosing the number of observations or replicates to include in a statistical sample 12,8/0 Example: A high-tech company wants to estimate the mean number of years of college education its employees have completed. A good estimate of the standard deviation for the number of years of college is 144. How large a sample needs to be taken to estimate u to within 0.5 of a...
A researcher wants to estimate the mean IQ score for a population of high school students. How many students will she have to select for the IQ tests if she wants 95% confidence the sample mean is within 3 IQ points of the population mean? Assume the population standard deviation is 15.
A Statistics professor wants to estimate the mean Math SAT score of incoming freshmen. It is known that Math SAT scores are normally distributed. In a random sample of 20 incoming freshmen, the mean Math SAT score was 527 with a standard deviation of 88. Construct a 90% confidence interval for the population mean. Use the appropriate formulas and show your work! 6.__________________________[8]
The manager of the Inlet Square Mall, near Ft. Myers, Florida, wants to estimate the mean amount spent per shopping visit by customers. A sample of 20 customers had a sample mean of $49.35 and a sample standard deviation of $9.01. Find the 95% confidence interval for the population mean.
I really need help with my Confidence Intervals for the Mean homework, can someone please help? 1. You measure 34 dogs' weights, and find they have a mean weight of 52 ounces. Assume the population standard deviation is 10.2 ounces. Based on this, construct a 99% confidence interval for the true population mean dog weight. Give your answers as decimals, to two places ________________ ± ______________ ounces 2. Assume that a sample is used to estimate a population mean μμ....
Students in a statistics class are conducting a survey to estimate the mean pe numbers in the bones. number of units students at their college are enrolled in. The students collect a part es points random sample of 47 students. The mean of the sample is 12.3 units. The Part 2: 5 points sample has a standard deviation of 1.9 units. 20 points What is the 95% confidence interval for the average number of units that students in their college...
An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within 1.7 years of the population mean. Assume the population of ages is normally distributed. (a) Determine the minimum sample size required to construct a 90% confidence interval for the population mean. Assume the population standard deviation is 1.8 years. (b) The sample mean is 20 years of age. Using the minimum sample size with a 90% level of confidence,...
The New York City school board wants to estimate the mean size μ of AP statistics classes in New York City high schools. The board obtained the following random sample of AP statistics class sizes: 24 29 29 23 25 24 33 26 24 29 27 26 22 32 24 21 19 29 31 26 29 31 16 Question 1. Use the data above to construct a 99% confidence interval for the mean class size μ. (calculate y and s...
7. You want to estimate the mean weight loss of people one year after using a popular weight-loss (1 point) program being advertised on TV. How many people on that program must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 ib of the true population mean? Assume that the population standard deviation is known to be 10.6 lb. 6907 0 4865 O 84 O6906 3. Given the standard deviation of...