A Math Professor records his commuting time to work on 24 days, finds a sample mean of 12 mins 45 seconds and standard deviation of 55 seconds. Suppose a normal quintile plot suggests the population is approximately normally distributed. If we are interested in creating a 95% confidence interval for σσ, the population standard deviation, then: a) What are the appropriate χ2RχR2 and χ2LχL2 values, the Right and Left Chi-square values? Round your responses to at least 3 decimal places. χ2R=χR2= χ2L=χL2=
A Math Professor records his commuting time to work on 24 days, finds a sample mean of 12 mins 45 seconds and standard deviation of 55 seconds. Suppose a normal quintile plot suggests the population is approximately
If we are interested in creating a 95% confidence interval for σσ, the population standard deviation, then:
a) What are the appropriate χ2RχR2 and χ2LχL2 values, the Right and Left Chi-square values?
Round your responses to at least 3 decimal places.
χ2R=χR2=
χ2L=χL2=
b) Next we construct the appropriate confidence interval.
Complete the statements below (rounding each of your interval bounds to at least 3 decimal places):
Context: "We are % confident that the true standard deviation of the professor's time to work lies between and "
Confidence: "Also, % confidence refers to the fact the best % of unbiased simple samples will produce an containing the population standard ."
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