Stats
posted by Tyler .
Suppose the following data are selected randomly from a population of normally distributed values.
42
51 43 48 41 57 54
39 45 48 45 39 46
Construct a 95% confidence interval to estimate the population mean.
Round the intermediate values to 2 decimal places. Round your answers to 2 decimal places, the tolerance is +/0.05.
I do not understand how to find the 's' for the estimate of standard deviation from the sample.
n=13
xbar=46
df= 12
alpha/2= 0.025
Therefore, t= 2.179
And I am stuck...

n=13
xbar=46
df= 12
alpha/2= 0.025
Therefore, t= 2.179
Sd = 5.5377
t = 2.179
(42.65, 49.35)
Z = 1.96
(42.99,49.01)
Respond to this Question
Similar Questions

business statistics
the following data values are a simple random sample form a population that is normally distributed, with ²= 25.0: 47,33,42,34, and 41. Construct and interpret the 95% and 99% confidence intervals for the population mean. 
Statitic
following data values are a simple random sample from a population that is normally distributed, with ssquared=25.0: 47, 43, 33, 42, 34, and 41. Construct and interpret the 95% and 99% confidence intervals for the population mean. 
elizabeth high school
. An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within one year of the population mean. Assume the population of ages is normally distributed. Determine the minimum … 
Statistics
An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within one year of the population mean. Assume the population of ages is normally distributed. Determine the minimum … 
Statistics (urgent)
A beverage comopany uses a machine to automatically fill 1liter bottles. Assume that the population of volumes is normally distributed. The company wants to estimate the mean volume of water to within 1 ML. Determine the minimum sample … 
statistics
1.A magazine reported that 6% of Americans read the news paper while driving. 100 drivers are selected at random, find the probability that exactly 25 of them say they read the newspaper while driving.(normal binomial formula to solve) … 
statistics
Randomly selected students participated in an experiment to test their ability to determine when one minute(or sixty seconds) has passed. Forty students yielded a sample mean of 61.8 seconds. Assuming that o= 11.7 seconds, Construct … 
statistics
A basketball scout randomly selected 144 players and timed how long each player took to perform a certain drill. The times in this sample were distributed with a mean of 8 minutes. The population standard deviation was known to be … 
stats
1. A confidence interval can be calculated to estimate the population mean when the population is normally distributed or the sample size is greater than 30. Can a confidence interval be calculated for the average number of hours of … 
statistics
An IQ test was administered to a random sample of 26 mental patients and the mean was found to be 99.7. For this test, the population values are known to be normally distributed and with a population standard deviation of 15. Construct …