Flashcards
AGEE 644 Class 5
Cards in this deck (27)
- 1The difference between the population parameter and a sample statisticSampling error
- 2Sample size _______ as the variance in the population on the variable of interest _______increases, increases
- 3This is the degree of precision "effect size" for the population being estimated.Acceptable margin of error
- 4Sample size _______ as the acceptable margin of error gets smaller; that is, as the acceptable degree of precision (effect size) becomes more preciseincreases
- 5(1-a) that is the actual margin of error (sampling error) is within the acceptable parameter being estimatedLevel of confidence
- 6Sample size ____ as the degree of confidence _______ that the actual margin or sampling error is within the acceptable margin of error; for example, a larger sample is required for 99% confidence level than for 95% confidence level.increases, increases
- 7Some guiding principles.. If it's there, will I find it? _____ How large does it need to be before I find it? ______ What are the chances that I made a mistake? ______Power
Effect
Level of confidence - 8d (________) = acceptable margin of error (degree of precision) for the population proportion being estimated, expressed as a proportion.d = effect size
example 4% - 9Critical value of t corresponding to the level of confidence (1-a) that the actual margin of error (sampling error) is within the acceptable margin of error (degree of precision).t
- 10Estimated variance in the population on the variable of interestpq
p=estimated proportion of cases in the category of interest
q= (1-p) - 11N= _____ n= ______N= Size of population
n= estimated sample size - 12What formula can be used to determine sample size?Cochran's Categorical (for nominal and ordinal)
Cochran's Metric (for interval/ratio) - 13s= (________) in the population on the variable being investigated. Estimated S can be obtained from related research on the variable of interest, or estimated s = possible range of values on the variable investigated divided by 4Estimated Standard Deviation
- 14(Practice Cochran's formula.. )Examples in Powerpoint
- 15This is the probability of making a correct decision when H0 (statistical hypothesis) is rejectedPower
- 16What are four factors that influence the power of the test?Sample size, level of alpha, effect size to be detected, and whether the test is directional or non directional
- 17What are three factors that influence sample size?Power of the test desired
Effect size to be detected
Level of alpha - 18When estimating sample size using Cohen, Cohen proposed that when the investigator has no other basis for setting the desired power value, the value of ____ should be used..80
- 19This says that when the null is false, it is false to some specific degree. The larger the value, the greater the degree to which the phenomenon under study is manifested.Effect size
- 20A form of probability sampling used when the population consists of a number of subgroups.Stratified sampling
- 21A form of probability sampling in which the researcher chooses a group of individuals that are naturally together (i.e. High schools vs students)Cluster Sampling
- 22A form of probability sampling in which the researcher draws a sample by taking every kth case from a list of the populationSystematic sampling
- 23______ is the standard reference for determining the minimum sample size for statistical testsCohen
- 24With a dependent t test, the degrees of freedom are the number of paired observations minus ____1
- 25With a Pearson r, the degrees of freedeom are the number of paired observations minus ___2
- 26________ is a statistical procedure used to analyze data from a study with more than two groups.One way analysis of variance
(Anova) - 27—
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- AGEE 644 Flashcards on AGEE 644 Class 5, created by Renee Conneway on 06/03/2018.
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- Renee Conneway
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