Elementary statistics

Question

Use technology and the given confidence level and sample data to find the confidence interval for the population mean . Assume that the population does not exhibit a normal distribution. Weight lost on a diet. 95% confidence, n=41, x=4.0 kg, s=5.5kg

Answer 1

t-value = 2.181347 for 95% confidence

mean +or- t-value * stddev/sqrt(n)

4.0 +or- 2.181347* 5.5/sqrt(41)

[4.0 - 2.181347* 5.5 / sqrt(41) , 4.0 + 2.181347* 5.5 / sqrt(41)]

[4.0 - 1.8736804183593384636704287287648..., 4.0 + 1.8736804183593384636704287287648...]

= [ 3.1263195816406615363295712712352‬ , 5.8736804183593384636704287287648]