Quiz
Week 8
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Fragen in diesem Quiz (16)
1In a normal distribution, μ = 50 and σ2 = 16. What is the approximate value of the score that would fall at the 95th percentile?
- A67
- B77
- C87
- D97
- E57
2If the probability of making a type II error is 0.3, what is the power of the analysis?
- A1.3
- B0.09
- C0.7
- D30
3The standard deviation of a distribution of sample means is known as:
- Athe central limit
- Bthe standard error of the estimate
- Cthe standard error of the mean
- Dthe mean absolute error
- Ea t-score
4Which of the following stands for the probability of erroneously rejecting a true null hypothesis?
- AEpsilon
- BBeta
- CChi
- DAlpha
- E(1-Beta)
5Adam, Ben, and Chris each drew a different random sample from a population with a mean of 155 and a standard deviation of 17. The standard error of the mean for Chris’s sample was largest and the standard error of the mean for Adam’s sample was smallest. Which of the following is true?
- AThe sample sizes cannot be determined.
- BChris drew the largest sample.
- CBen drew the largest sample.
- DAdam drew the largest sample.
6Parametric statistical techniques rely on _____ to determine the probability that the result from a sample are consistent with the null hypothesis.
- Astatistical significance
- Bsampling distributions
- CType II error
- DType I error
7In null hypothesis testing, the p value quantifies:
- Athe probability of finding an effect at least as large as that observed if the null hypothesis were false.
- Bthe probability of the null hypothesis being true.
- Cthe probability of finding an effect at least as large as that observed if the null hypothesis were true.
- Dthe probability of the null hypothesis being false.
- Ethe probability of the null hypothesis being false given the observed effect.
8On Monday, Michael rejected a null hypothesis that was true. On Tuesday, he retained a true null hypothesis. What kind of week is he having?
- Abad – he made a Type II error on Monday and a Type I error on Tuesday
- Bbad – he is confounded and his power level is too low
- Cbad – he made a Type I error on Monday and a Type II error on Tuesday
- Do.k. – he made a Type I error on Monday and a correct decision on Tuesday
- Egood – correct decisions on both days
9The statement that the independent variable had no effect is called the ________ hypothesis.
- Apractical
- Bnull
- Cresearch
- Dsignificant
10The probability of failing to detect an effect when one exists is known as a:
- AStandardised error.
- BStandard error.
- CType I error.
- DType II error.
11As the effect size increases, the statistical power of a study ____.
- Aincreases
- Bis unaffected
- Cdecreases
- Dapproaches zero
12What are used to tell you the probability that your results would be obtained if you repeated the study on many occasions?
- ANull hypotheses
- BInferential statistics
- CResearch hypotheses
- DDescriptive statistics
13If a relationship, or difference, between variables is statistically non-significant, it means that:
- Athe observed relationship or difference is likely assuming the null hypothesis is true
- Bthe observed relationship or difference is likely assuming the null hypothesis is false
- Cthe observed relationship or difference is unlikely assuming the null hypothesis is false
- Dthe observed relationship or difference is likely assuming the alternate hypothesis is false
- Ethe observed relationship or difference is unlikely assuming the null hypothesis is true
14The expected value of z if the null hypothesis is true would
- Aequal 1.
- Bequal 0.
- Cdepend on the degrees of freedom.
- Dvary depending on the alpha level.
15In null hypothesis testing, the Type II error rate (called “beta”)
- Ais also known as statistical power.
- Bincreases with the sample size.
- Cis calculated as 1 minus the Type I error rate (alpha).
- Dincreases as alpha decreases.
- Eis the probability of rejecting the null hypothesis when it is true.
16In testing differences between means, the _____ hypothesis would suggest the population means are different.
- Aresearch (or alternative)
- Bsignificant
- Cnull
- Dpractical
Informationen
- Beschreibung
- Quiz am Week 8, erstellt von ashleighdawn am 26/05/2015.
- Autor
- ashleighdawn
- Sprache
- English
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