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Math
Statistics
Hypothesis Testing
BIOS TEST 3
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Terms in this set (29)
Biostatisticians use the Wilcoxon Rank-Sum test of statistical inference when
When the data come from two independent samples from the population of interest
When using the Wilcoxon Signed-Rank test, if a data point has difference of zero, then
That data point is removed from the data set
To use the Wilcoxon Rank-Sum test, the sample sizes
Need to be greater than 10 for both groups
The non-parametric methods of statistical inference we have studied thus far compare
medians
The Wilcoxon Signed-Rank test is a non-parametric counterpart to
the paired t-test
Which of the following is not a requirement when using the Wilcoxon Signed-Rank test?
The sample consists of volunteers who are from the population of interest
When using the Wilcoxon Signed-Rank test, if the sample size is less than or equal to 12, then the test statistic will be:
T
When using the Wilcoxon Rank-Sum test, the test statistic is:
z
Which of the following statements does not apply to non-parametric methods of statistical inference?
They have higher statistical power compared to parametric tests
Biostatisticians use non-parametric methods of statistical inference when:
When both conditions of the Central Limit Theorem have been violated
The paired t-test is an extension of:
the one-sample t procedure
Which of the following is an example of a paired design?
A teacher compares the pre-test and post-test scores of students
Which of the following does the parameter μ represent in a paired t procedure?
the mean difference in the responses to the two groups within pairs of subjects in the entire population
The rationale for avoiding the pooled variance procedures for inference is
the two-sample t, or "unequal variances procedure," is valid regardless of whether or not the two variances are actually unequal
Yesterday, a poll from the Quick Vote feature on CNN's website tallied 26,494 responses. Tests of statistical inference like a 95% confidence interval should be challenged because:
The inference to the population comes from a voluntary response sample
You are thinking of employing a t procedure to test hypotheses about the mean of a population using a significance level of 0.05. You suspect the distribution of the population is not normal and may be moderately skewed. Which of the following statements is correct?
You may use the t procedure, provided your sample size is large, (at least 40)
Which of the following questions does a test of significance answer?
Is the observed effect due to chance?
Vigorous exercise helps people live several years longer (on average). Whether mild activities like slow walking extend life is not clear. Suppose that the added life expectancy from regular slow walking is just 2 months. Which of the following is true?
A statistical test of is more likely to find a significant increase in mean life expectancy if it is based on a very large random sample
In assessing the validity of any hypothesis test, it is good practice to:
-examine the probability model that serves as a basis for the test by using exploratory data analysis on the data
-determine exactly how the study was conducted
-determine what assumptions the researcher made
The most important condition for drawing sound conclusions from statistical inference is usually:
that the data can be thought of as a random sample from the population of interest
2 most common types of statistical inference
confidence intervals or hypothesis testing
term used to describe our best guess for an unknown parameter
point estimate
The relationship between the null and alternative hypothesis
they are mutually exclusive
Upon what rule do we base all hypothesis testing?
The rare event rule: if an event happens that would rarely happen if a claim were true, then the
fact that it happened is good evidence that the claim is not true
What statistical procedure do biostatisticians use for cross-over studies that incorporate continuous variables?
Paired T-Test
What statistical procedure do biostatisticians use for
a SRS where the population standard deviation is
known?
One Sample Z test
What 3 criteria must be met in order to use a one-sample t procedure?
1) SRS 2) CLT 3) population SD is unknown
what evidence is required for a t based conclusion?
test statistic, degrees of freedom, p-value
6 requirements for journal-style conclusion
population, casual inference, evidence, direction, magnitude, uncertainty
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