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The t-distribution with 8 degrees of freedom has_________________ the standard Normal distribution |
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| the same center but is more spread out than |
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We use a t-distribution with n-1 degrees of freedom rather than the standard Normal distribution whenever |
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Definition
We need to compensate for using s to estimate
σ |
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When analyzing data from a matched pairs experiment where measurements were taken on each individual before and after the treatment we always analyze |
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Definition
the differences: for each individual where each difference equals the before measurement minus the after measurement. |
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The t-distribution with 4 degrees of freedom is ________________ the standard Normal distribution. |
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Definition
flatter and more spread out than |
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| Standard error of x-bar refers to... |
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Definition
| ...the estimate of the standard deviation of the sampling distribution of x-bar |
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| Standard error of x-bar measures__________ of the sampling distribution of x-bar |
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Definition
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The test statistic t= x-bar - mu
___________
s/sq.rt of n
tells us |
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| how many STANDARD ERRORS the observed x-bar is from the claimed parameter value of mu naught. |
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| Whenever perfoming an inferential procedure on means using at t-distribution with n < 40 on should always... |
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Definition
| ...plot the data and check for strong skewness or outliers. |
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| An inferential procedure is said to be robust with respect to one of its assumptions if.... |
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Definition
| ....it provides good results even when assumption is not met. |
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| In practice when n < 40, before performing a one sample t procedure, we should check for... |
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Definition
| SRS and no outliers or strong skewness in the data. |
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| Find a 95% confidence interval for mu when n=9, x-bar= 103.14 and s=5.25 |
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Definition
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| 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? |
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Definition
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