Quiz
STA2023 Exam 3
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Questions in this quiz (52)
1What are the alternative titles for a correlated T test
- Apaired T test
- Bdependent sample t test
- Cnone of the above
- Dall of the above
2If the average height of males in the class is 5'10". We conclude that the average height of all males in the population of IRSC is also 5'10". This is an example of INTERVAL ESTIMATION.
- ATrue
- BFalse
3A series of procedures in which sample data are used to make statements about the populations.
- AStatistical Inference
- BDescriptive Statistics
- CInferential Statistics
- DRandom Sample
- ENone of the above
4The Symbol for a Type 2 error is
- Aß
- B1-ß
- CPearson r
- Dµ
5We commit a Type II error when
- Awe reject the alternative when we should have accepted it
- Bwe accept the null when we should have accepted it
- Cwe fail to reject the null when we should have accepted it.
6We calculate a t crtical value of ±1.96 and a t of -2.17. Based on this information we would accept the null.
- ATrue
- BFalse
7The Central Limit Theorem states that if an infinite amount of randomly selected sampled of a fixed n are drawn from a population:
- Aas the n increases, the distribution mean approaches normality
- Bthe mean of means equals µ
- Cthe dispersion of the means around µ is equal to the standard error of the mean
- DNone of the above
- EAll of the above
8Statistical Power is a function of what four things?
- ASample size (n)
- BRandomness
- CMean difference
- DIndependent observations
- EAlpha
- FNormality
- GWithin Group Variability (WGV)
9Two independent T tests have what four assumptions?
- AHomoscedasticity, Within Group Variability, Alpha, and Normality
- BRandomness, Normality, Homoscedasticity, and Independent Observations
- CConfidence Interval, Independent Observations, Within Group Variability, and Normality
10A one-tailed test is also referred to as
- Aone-tailed probablity
- Bone-tailed hypothesis
- Cnon directional test
- Ddirectional test
11A one-tailed test is considered more scientifically credible
- ATrue
- BFalse
12The alternative hypotheses states that there is a significant difference between group means and/or the relationship that is real and significant.
- ATrue
- BFalse
13The goal of hypothesis testing is the accept the null in favor of the alternative.
- ATrue
- BFalse
14If p< alpha we:
- Areject the null
- Baccept the null
15The statistical power is a function of four things:
1. [blank_start]mean difference[blank_end]
2. [blank_start]sample size[blank_end]
3. [blank_start]within group variability[blank_end]
4. [blank_start]alpha[blank_end]- Amean difference
- Bsample size
- Cwithin group variability
- Dalpha
16sampling error is the distance of any sample mean from µ
- ATrue
- BFalse
17If we reject the null hypothesis what happens to the p region of the standard distribution?
- Athe p region increases
- Bthe p region decreases
18If p< alpha we:
- Aaccept the null
- Breject the null
19A researcher is studying the effectiveness of a new daily treatment for asthma on overall lung capacity. The researcher randomly selected 15 asthma sufferers and measured their lung capacity. The researched then administered a 5 week course of treatment. After the 5 weeks she measured the participants' lung capacity again. What test did she use to measure the results.
- Atwo independent sample t test
- Bcorrelated t test
- Csampling distribution
- Dsampling error
20Statistical power is represented by what symbol
- A1-ß
- Balpha
- C∑
- Dµ
21We randomly assign two groups of coffee drinkers to avoid drinking coffee for one week. One group is given an apple each morning instead of coffee, the other group is given black tea. To measure the statistical difference between the times each group vocalized craving coffee we would use the two independent sample t test.
- ATrue
- BFalse
22A researched is measuring the impact on the same dependent variable for two different groups. Which would be the best test to run?
- Atwo independent sample t test
- Bcorrelated t test
23Hypothesis testing is the most widely utilized set of inferential procedures in science.
- ATrue
- BFalse
24Which category of Inferential Statistics are we employing when we are testing if a belief or claim about a population parameter is true?
- APoint Estimation
- BInterval Estimation
- CAll of the above
- DHypothesis Testing
- ENone of the above
25What are the steps within the Repeated Measures Design?
- AExperiment, Sample, Point Estimation
- BPretest, Experiment, Post test, Difference
- CHypothesis, Sample, Difference, Test
26The mean of the xbars on a sampling distribution equals
- Aµ
- Bß
- C1-ß
- Dnone of the above
27When we take a sample statistic and automatically conclude that it is, indeed, the corresponding population parameter we are using:
- AInterval Estimation
- BPoint Estimation
- CStatistical Hypothesis
28If an infinite amount of randomly selected samples of a fixed sample n are drawn from a population regardless of the shape of the distribution we are referring to:
- AThe Central Limit Theorem
- BInterval Estimation
- CSampling Distibution
29What is the calculation for sampling distribution?
- Athe distance from any sample mean from µ
- Bthe difference between Pearson r and rho
- Cthe difference between sigma and s
- Dnone of the above
30Power decreases as as mean difference increases
- ATrue
- BFalse
31As Sampling size decreases, power increases
- ATrue
- BFalse
32A study is being conducted on the efficacy of a new medication. As the study measures the results on more people, what two things happen to the hypothesis ?
- AThe sample size increases
- BThe sample size decreases
- CThe statistical power increases
- DThe statistical power decreases
33WGV is a function of statistical power and it refers to
- AWithin Group Variability
- BWithin Group Viability
- CWillingness Group
34Sampling Error is the distance from any sample mean to mu
- ATrue
- BFalse
35Our alpha is = to .05, we can assume that p=
- A.01
- B.025
- C.05
- D5
36Before we run any statistical test p ≠ alpha
- ATrue
- BFalse
37It is more difficult to reject the null using a two tailed test because the critical values are higher
- ATrue
- BFalse
38A two-tailed test predicts that outcomes will fall in one end of the distribution.
- ATrue
- BFalse
39What is the appropriate statistical test to use when we have two independent sample groups
- Acorrelated t test
- Btwo independent sample t test
- Cz test
- Dpoint estimation
40The most unique difference between repeated measures and other experimental designs is that in repeated measures, subjects serve as their own control.
- ATrue
- BFalse
41A researcher breaks 20 adults into two groups and is using a two independent sample t test to calculate the effect of candy on attention span. Half of the group is given chocolate and the other half is not. The independent variable is [blank_start]the candy[blank_end] and the dependent variable is [blank_start]attention span[blank_end]. Alpha is .05 and we set p to [blank_start].05[blank_end]. The Null Hypothesis is [blank_start]Hsub0: µ1 = µ2[blank_end], the alternate hypothesis is [blank_start]Hsub1: µsub1 ≠ µsub2[blank_end].
- Athe candy
- Bthe attention span
- Cattention span
- Dthe candy
- E.05
- F.01
- G.1
- H.025
- IHsub0: µsub1 = µsub2
- JHsub1: µsub1 ≠ µsub2
- KHsub0: Xbar = µ
- LHsub0: rho = 0
- MHsub1: µsub1 ≠ µsub2
- NHsub0: µsub1 = µsub2
- OHsub1: µsub1 = µsub2
- PHsub1: rho ≠ 0
42When µ is known and sigma is known what calculation do you use?
- Acorrelated t test
- Bz test
- Ctwo independent sample t
- Dinterval estimation
43Sigma is known and s is given, so we will use the:
- Aone sample t test
- Bz test
- Ccorrelated t test
- Dstandard deviation
44When testing a hypothesis where Pearson r is given, the null hypothesis is [blank_start]Hsub0: rho = 0[blank_end] and the alternate hypothesis is [blank_start]Hsub1: rho ≠ 0[blank_end]
- AHsub0: rho = 0
- BHsub0: rho ≠ 0
- CHsub0: rho ≠ Pearson r
- DHsub1: rho ≠ 0
- EHsub1: rho ≠ Pearson r
45In a correlated t test the null hypothesis would be what?
- AHsub0: µpre = µpost
- BHsub0: µsub d bar = 0
- CHsub1: µpre = µpost
46Heights are measured from a random sample of 50 females is taken from the IRSC student body. Based on the rules of Generalization, why can we generalize these to a greater population?
- ABecause we had a large enough sample size
- BBecause the sample was randomized
- CBecause IRSC is a diverse school and represents various subsets of the female population
- DWe cannot generalize these results
47To calculate the degrees of freedom for a t test calculate n - 1
- ATrue
- BFalse
48A group of volunteers take part in a study to test the effects of sunlight on skin tone. The results can be generalized to the population.
- ATrue
- BFalse
49Vets tested the effectiveness of wet food on cavities and gum disease in cats.
- AThis is a correlated t test
- BThis is a two tailed independent t test
- CThis is a sampling distribution
- DAll of the above
- ENone of the above
50In two tailed hypothesis test the two critical values divide the area under the sampling distribution into
- Ainto two rejection and one nonrejection regions
- Binto two rejection and two nonrejection regions
- Cinto one rejection and two nonrejection regions
- Dinto one rejection and one nonrejection regions
51We have accepted a Null. What is the chance that we achieved a Type 2 error (ß)
- A5%
- B1%
- CWe do not calculate a numerical value for a Type 2 error
- DNone of the above
52In hypothesis testing for a two-tailed test, the p-value is given by:
- Athe area under the curve between the mean and the observed value of the test statistic
- Btwice the area under the curve between the mean and the observed value of the test statistic
- Cthe area in the tail beyond the observed value of the test statistic
- Dtwice the area in the tail beyond the observed value of the test statistic
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- This is a quiz to use a s a test review for Dr. Strale's STA2023 Elementary Statistics Exam #3
- Author
- Emily Dailey
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- English
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