We use the rdistribution to construct a confidence interval for the population mean when the underlying population standard deviation is not known. Under the assumption that the population is normally distributed, find t/2.df for the following scenarios. (You may find it useful to reference the Ltable. Round your answers to 3 decimal places.) ta/2.df a. A 90% confidence level and a sample of 19 observations. A 95% confidence level and a sample of 19 observations. .. A 90% confidence level and a sample of 11 observations. d. A 95% confidence level and a sample of 11 observations.

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We use the rdistribution to construct a confidence interval for the population mean when the underlying population standard deviation
is not known. Under the assumption that the population is normally distributed, find t/2,df for the following scenatios. (You mey find
it useful to reference the ttable. Round your answers to 3 decimal places.)
ta/2,df
a. A 90% confidence level and a sample of 19 observations.
A 95% confidence level and a sample of 19 observations.
A 90% confidence level and a sample of 11 observations.
d. A 95% confidence level and a sample of 11 observations.
b.
Transcribed Image Text:We use the rdistribution to construct a confidence interval for the population mean when the underlying population standard deviation is not known. Under the assumption that the population is normally distributed, find t/2,df for the following scenatios. (You mey find it useful to reference the ttable. Round your answers to 3 decimal places.) ta/2,df a. A 90% confidence level and a sample of 19 observations. A 95% confidence level and a sample of 19 observations. A 90% confidence level and a sample of 11 observations. d. A 95% confidence level and a sample of 11 observations. b.
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