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STA2023 Exam 3

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This is a quiz to use a s a test review for Dr. Strale's STA2023 Elementary Statistics Exam #3
Emily Dailey
Quiz by Emily Dailey, updated more than 1 year ago
Emily Dailey
Created by Emily Dailey over 7 years ago
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Resource summary

Question 1

Question
What are the alternative titles for a correlated T test
Answer
  • paired T test
  • dependent sample t test
  • none of the above
  • all of the above

Question 2

Question
If 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.
Answer
  • True
  • False

Question 3

Question
A series of procedures in which sample data are used to make statements about the populations.
Answer
  • Statistical Inference
  • Descriptive Statistics
  • Inferential Statistics
  • Random Sample
  • None of the above

Question 4

Question
The Symbol for a Type 2 error is
Answer
  • ß
  • 1-ß
  • Pearson r
  • µ

Question 5

Question
We commit a Type II error when
Answer
  • we reject the alternative when we should have accepted it
  • we accept the null when we should have accepted it
  • we fail to reject the null when we should have accepted it.

Question 6

Question
We calculate a t crtical value of ±1.96 and a t of -2.17. Based on this information we would accept the null.
Answer
  • True
  • False

Question 7

Question
The Central Limit Theorem states that if an infinite amount of randomly selected sampled of a fixed n are drawn from a population:
Answer
  • as the n increases, the distribution mean approaches normality
  • the mean of means equals µ
  • the dispersion of the means around µ is equal to the standard error of the mean
  • None of the above
  • All of the above

Question 8

Question
Statistical Power is a function of what four things?
Answer
  • Sample size (n)
  • Randomness
  • Mean difference
  • Independent observations
  • Alpha
  • Normality
  • Within Group Variability (WGV)

Question 9

Question
Two independent T tests have what four assumptions?
Answer
  • Homoscedasticity, Within Group Variability, Alpha, and Normality
  • Randomness, Normality, Homoscedasticity, and Independent Observations
  • Confidence Interval, Independent Observations, Within Group Variability, and Normality

Question 10

Question
A one-tailed test is also referred to as
Answer
  • one-tailed probablity
  • one-tailed hypothesis
  • non directional test
  • directional test

Question 11

Question
A one-tailed test is considered more scientifically credible
Answer
  • True
  • False

Question 12

Question
The alternative hypotheses states that there is a significant difference between group means and/or the relationship that is real and significant.
Answer
  • True
  • False

Question 13

Question
The goal of hypothesis testing is the accept the null in favor of the alternative.
Answer
  • True
  • False

Question 14

Question
If p< alpha we:
Answer
  • reject the null
  • accept the null

Question 15

Question
The 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]
Answer
  • mean difference
  • sample size
  • within group variability
  • alpha

Question 16

Question
sampling error is the distance of any sample mean from µ
Answer
  • True
  • False

Question 17

Question
If we reject the null hypothesis what happens to the p region of the standard distribution?
Answer
  • the p region increases
  • the p region decreases

Question 18

Question
If p< alpha we:
Answer
  • accept the null
  • reject the null

Question 19

Question
A 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.
Answer
  • two independent sample t test
  • correlated t test
  • sampling distribution
  • sampling error

Question 20

Question
Statistical power is represented by what symbol
Answer
  • 1-ß
  • alpha
  • ∑
  • µ

Question 21

Question
We 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.
Answer
  • True
  • False

Question 22

Question
A researched is measuring the impact on the same dependent variable for two different groups. Which would be the best test to run?
Answer
  • two independent sample t test
  • correlated t test

Question 23

Question
Hypothesis testing is the most widely utilized set of inferential procedures in science.
Answer
  • True
  • False

Question 24

Question
Which category of Inferential Statistics are we employing when we are testing if a belief or claim about a population parameter is true?
Answer
  • Point Estimation
  • Interval Estimation
  • All of the above
  • Hypothesis Testing
  • None of the above

Question 25

Question
What are the steps within the Repeated Measures Design?
Answer
  • Experiment, Sample, Point Estimation
  • Pretest, Experiment, Post test, Difference
  • Hypothesis, Sample, Difference, Test

Question 26

Question
The mean of the xbars on a sampling distribution equals
Answer
  • µ
  • ß
  • 1-ß
  • none of the above

Question 27

Question
When we take a sample statistic and automatically conclude that it is, indeed, the corresponding population parameter we are using:
Answer
  • Interval Estimation
  • Point Estimation
  • Statistical Hypothesis

Question 28

Question
If 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:
Answer
  • The Central Limit Theorem
  • Interval Estimation
  • Sampling Distibution

Question 29

Question
What is the calculation for sampling distribution?
Answer
  • the distance from any sample mean from µ
  • the difference between Pearson r and rho
  • the difference between sigma and s
  • none of the above

Question 30

Question
Power decreases as as mean difference increases
Answer
  • True
  • False

Question 31

Question
As Sampling size decreases, power increases
Answer
  • True
  • False

Question 32

Question
A 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 ?
Answer
  • The sample size increases
  • The sample size decreases
  • The statistical power increases
  • The statistical power decreases

Question 33

Question
WGV is a function of statistical power and it refers to
Answer
  • Within Group Variability
  • Within Group Viability
  • Willingness Group

Question 34

Question
Sampling Error is the distance from any sample mean to mu
Answer
  • True
  • False

Question 35

Question
Our alpha is = to .05, we can assume that p=
Answer
  • .01
  • .025
  • .05
  • 5

Question 36

Question
Before we run any statistical test p ≠ alpha
Answer
  • True
  • False

Question 37

Question
It is more difficult to reject the null using a two tailed test because the critical values are higher
Answer
  • True
  • False

Question 38

Question
A two-tailed test predicts that outcomes will fall in one end of the distribution.
Answer
  • True
  • False

Question 39

Question
What is the appropriate statistical test to use when we have two independent sample groups
Answer
  • correlated t test
  • two independent sample t test
  • z test
  • point estimation

Question 40

Question
The most unique difference between repeated measures and other experimental designs is that in repeated measures, subjects serve as their own control.
Answer
  • True
  • False

Question 41

Question
A 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].
Answer
  • the candy
  • the attention span
  • attention span
  • the candy
  • .05
  • .01
  • .1
  • .025
  • Hsub0: µsub1 = µsub2
  • Hsub1: µsub1 ≠ µsub2
  • Hsub0: Xbar = µ
  • Hsub0: rho = 0
  • Hsub1: µsub1 ≠ µsub2
  • Hsub0: µsub1 = µsub2
  • Hsub1: µsub1 = µsub2
  • Hsub1: rho ≠ 0

Question 42

Question
When µ is known and sigma is known what calculation do you use?
Answer
  • correlated t test
  • z test
  • two independent sample t
  • interval estimation

Question 43

Question
Sigma is known and s is given, so we will use the:
Answer
  • one sample t test
  • z test
  • correlated t test
  • standard deviation

Question 44

Question
When 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]
Answer
  • Hsub0: rho = 0
  • Hsub0: rho ≠ 0
  • Hsub0: rho ≠ Pearson r
  • Hsub1: rho ≠ 0
  • Hsub1: rho ≠ Pearson r

Question 45

Question
In a correlated t test the null hypothesis would be what?
Answer
  • Hsub0: µpre = µpost
  • Hsub0: µsub d bar = 0
  • Hsub1: µpre = µpost

Question 46

Question
Heights 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?
Answer
  • Because we had a large enough sample size
  • Because the sample was randomized
  • Because IRSC is a diverse school and represents various subsets of the female population
  • We cannot generalize these results

Question 47

Question
To calculate the degrees of freedom for a t test calculate n - 1
Answer
  • True
  • False

Question 48

Question
A 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.
Answer
  • True
  • False

Question 49

Question
Vets tested the effectiveness of wet food on cavities and gum disease in cats.
Answer
  • This is a correlated t test
  • This is a two tailed independent t test
  • This is a sampling distribution
  • All of the above
  • None of the above

Question 50

Question
In two tailed hypothesis test the two critical values divide the area under the sampling distribution into
Answer
  • into two rejection and one nonrejection regions
  • into two rejection and two nonrejection regions
  • into one rejection and two nonrejection regions
  • into one rejection and one nonrejection regions

Question 51

Question
We have accepted a Null. What is the chance that we achieved a Type 2 error (ß)
Answer
  • 5%
  • 1%
  • We do not calculate a numerical value for a Type 2 error
  • None of the above

Question 52

Question
In hypothesis testing for a two-tailed test, the p-value is given by:
Answer
  • the area under the curve between the mean and the observed value of the test statistic
  • twice the area under the curve between the mean and the observed value of the test statistic
  • the area in the tail beyond the observed value of the test statistic
  • twice the area in the tail beyond the observed value of the test statistic
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