# Shared Flashcard Set

## Details

EXAM 3
PRACTICE QUESTIONS
15
Mathematics
03/29/2011

Term
 The t-distribution with 8 degrees of freedom has_________________ the standard Normal distribution
Definition
 the same center but is more spread out than
Term
 We use a t-distribution with n-1 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 t-distribution with 4 degrees of freedom is ________________ the standard Normal distribution.
Definition
 flatter and more spread out than
Term
 Standard error of x-bar refers to...
Definition
 ...the estimate of the standard deviation of the sampling distribution of x-bar
Term
 Standard error of x-bar measures__________ of the sampling distribution of x-bar
Definition
Term
 The test statistic t= x-bar - mu                            ___________                            s/sq.rt of n tells us
Definition
 how many STANDARD ERRORS the observed x-bar is from the claimed parameter value of mu naught.
Term
 Whenever perfoming an inferential procedure on means using at t-distribution 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, x-bar= 103.14 and s=5.25
Definition
 (99.10, 107.18)
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 P-value?
Definition
 0.005
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