Previously, when making inferences about the population mean
... Except in the case of small samples, the condition that the data are an SRS from the population of interest is more important than the condition that the population distribution is normal. Sample size less than 15: Use t procedures if the data appear close to normal (roughly symmetric, single pe ...
... Except in the case of small samples, the condition that the data are an SRS from the population of interest is more important than the condition that the population distribution is normal. Sample size less than 15: Use t procedures if the data appear close to normal (roughly symmetric, single pe ...
standard deviation - University of Warwick
... Obtaining a p-value for a t-statistic • To obtain the p-value for this t-statistic we could consult a table of critical values for the t-distribution • The number of degrees of freedom we refer to in the table in the combined sample size minus two: df = N1 + N2 – 2 • Here that is 20 + 20 – 2 = 38 • ...
... Obtaining a p-value for a t-statistic • To obtain the p-value for this t-statistic we could consult a table of critical values for the t-distribution • The number of degrees of freedom we refer to in the table in the combined sample size minus two: df = N1 + N2 – 2 • Here that is 20 + 20 – 2 = 38 • ...
16) Use graphs to compare the head circumference of two months
... To fine-tune our estimate, we find a confidence interval which is a range (or interval) of values that is likely to contain the true value of the population mean. Show all work, and then check with a calculator feature. (Are you using z or t? Why?) We are using t because we are not given the standar ...
... To fine-tune our estimate, we find a confidence interval which is a range (or interval) of values that is likely to contain the true value of the population mean. Show all work, and then check with a calculator feature. (Are you using z or t? Why?) We are using t because we are not given the standar ...
G242 ** GG 22 44 22 **
... instruction to look at the 'pattern of observed frequencies' and made general comments about 'independence' In part (ii), many seemed unsure how to calculate the missing expected frequencies - attempts at X = 5 were more successful than for X = 6 or more. Few candidates identified the correct number ...
... instruction to look at the 'pattern of observed frequencies' and made general comments about 'independence' In part (ii), many seemed unsure how to calculate the missing expected frequencies - attempts at X = 5 were more successful than for X = 6 or more. Few candidates identified the correct number ...