# Shared Flashcard Set

## Details

Exam 2
Biostatistics
23
Audiology
03/28/2019

Term
 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 ___
Definition
 unequal
Term
 What is the distribution we use for calculating a confidence interval around a single variance of normally distributed population?
Definition
 Chi-square distribution
Term
 A ___ ___ is a single numerical value used to estimate the corresponding population parameter
Definition
 point estimate
Term
 As you increase your confidence level, the width of the confidence interval ___
Definition
 increases
Term
 As you increase your sample size, the standard error ___
Definition
 decreases
Term
 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
Definition
 sampled; target
Term
 ___ ___ 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.
Definition
 Statistical inference
Term
 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.
Definition
 interval estimate
Term
 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 __________.
Definition
 precision; margin of error
Term
 A specific value computed from a sample that is used in deciding between H0 and HA is a ___ ___
Definition
 Test statistic
Term
 If you fail to reject a null that is incorrect, what kind of error have you made?
Definition
 Type 2 error (false negative)
Term
 If the test statistic does not fall into the rejection region, what is our statistical decision?
Definition
 Fail to reject the null hypothesis
Term
 The significance level is represented by the Greek letter ___
Definition
 a (alpha)
Term
 Given α, one way to reduce B, p(type II error), is to increase the ___ ___
Definition
 sample size
Term
 What is the probability of failing to reject a false null hypothesis?
Definition
 B Beta
Term
 What is the probability of rejecting a false null?
Definition
 1 - B (called “power”)
Term
 What type of error have you made if you reject a null hypothesis that is true?
Definition
 Type 1 error (false positive)
Term
 A ___ may be defined simply as a statement about one or more populations.
Definition
 hypothesis
Term
 The level of significance ___ is a probability and in fact is the probability of rejecting a true null hypothesis
Definition
 alpha (a)
Term
 The error committed when a true null hypothesis is rejected is called the ___ ___ error.
Definition
 type I
Term
 The ___ ___ error is the error committed when a false null hypothesis is not rejected.
Definition
 type II
Term
 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.
Definition
 p value; p value
Term
 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.
Definition
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