95% Confidendence Limits
StatisticsSymbolValue
Arithmetic mean in milesxbar2163
95% Confidence range
Lower limit in miles95% LCR2080
Upper Limit in miles95% UCR2245
95% Confidence interval in miles95% CI82
95% Confidence interval in %rel95% CI3.8
Variance in miles^2var(x)29259
Standard deviation in milessd(x)171
Coefficient of variation in %relCV7.9
Number of measured valuesn19
Variance of central value in milesvar(xbar)1540
Standard deviation in milessd(xbar)39
Degrees of freedomdf18
Tabulated t-value at 5% probabilityt0.05;df2.10 ■
Re: Confidence Interval
Sounds like student strife. ■
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Confidence Interval
Plz Help!!!!!!! I can't figure this out
Confidence interval for the population mean: Use of the t distribution
A corporation that maintains a large fleet of company cars for the use of its sales staff is interested in the mean distance driven monthly per sales person. The following table gives the monthly distances in miles driven by a random sample of sales persons:
2232,2091,2246,2280,2129,2393,2210,2498,2250,1903,2365,
1984,2028,2083,1881,2204,2282,2104,1926
Based on this sample, find a confidence interval for the mean number of miles driven monthly by members of the sales staff, assuming that monthly driving distances are normally distributed. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
**Questions from the above scenario**
What is the lower limit confidence level?
What is the upper limit confidence level? ■