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A high-tech company wants to estimate the mean number of years of college education its employees...
Need help with Statistics problem for homework. 1. A high-tech company wants to estimate the mean...
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.
Activity 9: Required sample sizes for hypothesis tests Sample size determination is the act of choosing...
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...
In developing patient appointment schedules, a medical center wants to estimate the mean time that a...
In developing patient appointment schedules, a medical center wants to estimate the mean time that a staff member spends with each patient. How large a sample should be taken if the desired margin of error is two minutes at a 95% level of confidence? How large a sample should be taken for a 99% level of confidence? Use a planning value for the population standard deviation of 6 minutes. 95% Confidence (to the nearest whole number): 99% Confidence (to the...
A researcher wants to estimate the mean IQ score for a population of high school students....
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.
An admissions director wants to estimate the mean age of all students enrolled at a 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,...
An admissions director wants to estimate the mean age of all students enrolled at a college....
An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within 1.5 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 1.6 years. (b) The sample mean is 20 years of age. Using the minimum sample size with a 90% level of confidence,...
To estimate the mean score of those who took the Medical College Admission Test on your...
To estimate the mean score of those who took the Medical College Admission Test on your campus, you will obtain the scores of an SRS of students. From published information you know that the scores are approximately Normal with standard deviation about 6.3. You want your sample mean & to estimate u with an error of no more than 1.3 point in either direction. (a) What standard deviation must have so that 99.7% of all samples give an x within...
An admissions director wants to estimate the mean age of all students enrolled at a college....
An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within 1.1 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 1.7 years (b) The sample mean is 21 years of age. Using the minimum sample size with a 90% level of confidence,...
To estimate the mean score μ of those who took the Medical College Admission Test on...
To estimate the mean score μ of those who took the Medical College Admission Test on your campus, you will obtain the scores of an SRS of students. From published information you know that the scores are approximately Normal with standard deviation about 6.5 . You want your sample mean x¯ to estimate μ with an error of no more than 1.4 point in either direction. (a) What standard deviation must x¯ have so that 99.7% of all samples give...
You need to estimate the mean number of travel days per year for salespeople. The mean...
You need to estimate the mean number of travel days per year for salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 32 days. If you must estimate the population mean within 5 days, how many salespeople should you sample? Use the 95% confidence level. (Use z Distribution Table.) (Round your answer to the next whole number.) Number of outside salespeople
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...
In developing patient appointment schedules, a medical center wants to estimate the mean time that a staff member spends with each patient. How large a sample should be taken if the desired margin of error is two minutes at a 95% level of confidence? How large a sample should be taken for a 99% level of confidence? Use a planning value for the population standard deviation of 6 minutes. 95% Confidence (to the nearest whole number): 99% Confidence (to the...
An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within 1.5 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 1.6 years. (b) The sample mean is 20 years of age. Using the minimum sample size with a 90% level of confidence,...
To estimate the mean score of those who took the Medical College Admission Test on your campus, you will obtain the scores of an SRS of students. From published information you know that the scores are approximately Normal with standard deviation about 6.3. You want your sample mean & to estimate u with an error of no more than 1.3 point in either direction. (a) What standard deviation must have so that 99.7% of all samples give an x within...
An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within 1.1 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 1.7 years (b) The sample mean is 21 years of age. Using the minimum sample size with a 90% level of confidence,...
You need to estimate the mean number of travel days per year for salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 32 days. If you must estimate the population mean within 5 days, how many salespeople should you sample? Use the 95% confidence level. (Use z Distribution Table.) (Round your answer to the next whole number.) Number of outside salespeople
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