Term
The tdistribution with 8 degrees of freedom has_________________ the standard Normal distribution 

Definition
the same center but is more spread out than 


Term
We use a tdistribution with n1 degrees of freedom rather than the standard Normal distribution whenever 

Definition
We need to compensate for using s to estimate
σ 


Term
When analyzing data from a matched pairs experiment where measurements were taken on each individual before and after the treatment we always analyze 

Definition
the differences: for each individual where each difference equals the before measurement minus the after measurement. 


Term
The tdistribution with 4 degrees of freedom is ________________ the standard Normal distribution. 

Definition
flatter and more spread out than 


Term
Standard error of xbar refers to... 

Definition
...the estimate of the standard deviation of the sampling distribution of xbar 


Term
Standard error of xbar measures__________ of the sampling distribution of xbar 

Definition


Term
The test statistic t= xbar  mu
___________
s/sq.rt of n
tells us 

Definition
how many STANDARD ERRORS the observed xbar is from the claimed parameter value of mu naught. 


Term
Whenever perfoming an inferential procedure on means using at tdistribution with n < 40 on should always... 

Definition
...plot the data and check for strong skewness or outliers. 


Term
An inferential procedure is said to be robust with respect to one of its assumptions if.... 

Definition
....it provides good results even when assumption is not met. 


Term
In practice when n < 40, before performing a one sample t procedure, we should check for... 

Definition
SRS and no outliers or strong skewness in the data. 


Term
Find a 95% confidence interval for mu when n=9, xbar= 103.14 and s=5.25 

Definition


Term
Suppose we were to test the hypotheses H0: mu=80 versus Ha: mu<80 and computed the standarized value of the test statistic to be t=2.67 from the sample results of a sample of size n=22. Using the t table, what is the Pvalue? 

Definition

