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| Equal Variance Rule of Thumb: if the larger sample variance is more than twice as large as the smaller sample variance then the population variances are ___ |
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| What is the distribution we use for calculating a confidence interval around a single variance of normally distributed population? |
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| A ___ ___ is a single numerical value used to estimate the corresponding population parameter |
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| As you increase your confidence level, the width of the confidence interval ___ |
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| As you increase your sample size, the standard error ___ |
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| The ___ population is the population from which one actually draws a sample whereas the ___ population is the one which one wishes to make an inference |
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| ___ ___ is the procedure by which we reach a conclusion about a population on the basis of the information contained in a sample drawn from that population. |
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| An ___ ___ consists of two numerical values defining a range of values that, with a specified degree of confidence, most likely includes the parameter being estimated. |
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| The quantity obtained by multiplying the reliability factor by the standard error of the mean is called the ___ of the estimate. This quantity is also called the __________. |
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| precision; margin of error |
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| A specific value computed from a sample that is used in deciding between H0 and HA is a ___ ___ |
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| If you fail to reject a null that is incorrect, what kind of error have you made? |
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| Type 2 error (false negative) |
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| If the test statistic does not fall into the rejection region, what is our statistical decision? |
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| Fail to reject the null hypothesis |
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| The significance level is represented by the Greek letter ___ |
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| Given α, one way to reduce B, p(type II error), is to increase the ___ ___ |
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| What is the probability of failing to reject a false null hypothesis? |
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| What is the probability of rejecting a false null? |
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| What type of error have you made if you reject a null hypothesis that is true? |
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| Type 1 error (false positive) |
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| A ___ may be defined simply as a statement about one or more populations. |
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| The level of significance ___ is a probability and in fact is the probability of rejecting a true null hypothesis |
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| The error committed when a true null hypothesis is rejected is called the ___ ___ error. |
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| The ___ ___ error is the error committed when a false null hypothesis is not rejected. |
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| A ___ ___ is the probability that the computed value of a test statistic is at least as extreme as a specified value of the test statistic when the null hypothesis is true. Thus, the ___ ___ is the smallest value of a for which we can reject a null hypothesis. |
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Which equation would you use for this problem:
The goal of a study by Klingler et al. (A-2) was to determine how symptom recognition and perception influence clinical presentation as a function of race. They characterized symptoms and care-seeking behavior in African-American patients with chest pain seen in the emergency department. One of the presenting vital signs was systolic blood pressure. Among 157 African-American men, the mean systolic blood pressure was 146 mm Hg with a standard deviation of 27. We wish to know if, on the basis of these data, we may conclude that the mean systolic blood pressure for a population of African- American men is greater than 140. |
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