Capella PSYC4700 Week 5 Quiz Latest 2023

Question # 00647052
Subject: Psychology
Due on: 06/06/2023
Posted On: 06/06/2023 01:55 AM
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PSYC4700 - Stat for Behavioral Sciences

Week 5 Quiz 1

Question 1

A distribution of all sample means or sample variances that could be obtained in samples of a given size from the same population is called                                        

a. a conditional procedure.

b. a sampling distribution.

c. sampling without replacement.

d. random sampling.

Question 2

Experimental research is typically conducted using a sampling strategy in which                                

a. the order of selecting participants matters.

 b. the same participant can never be selected twice in the same sample.

c. participants are replaced after being sampled.

d. all of the above.

Question 3

What is the central limit theorem?                                          

a. It explains that sample means will vary minimally from the population mean.

 b. It explains that a sampling distribution of possible sample means is approximately normally distributed, regardless of the shape of the distribution in the population.

c. It explains that if we select a sample at random, then on average we can expect the sample mean to equal the population mean.

d. All of the above.

Question 4

The sampling distribution of the mean and the sampling distribution of the variance (when dividing SS by n - 1)                                 

a.

both follow the central limit theorem.

b. are both unbiased estimators.

c. are both associated with minimal variance.

d. all of the above.

Question 5

Each of the following statements are true, except that                                 

a. increasing the sample size will decrease standard error.

 b. the larger the sample size, the larger the standard error.

c. the larger the standard deviation in the population, the larger the standard error.

d. the smaller the sample size, the larger the population size.

Question 6

A researcher selects a sample of 25 participants from a population with a mean of 10 and a standard deviation of 5. What is the probability of selecting a sample mean equal to at least 12?                                

a. less than 1%

b. greater than 50%

c. about the same as selecting a sample mean that is at least equal to the population mean

 d. equal to the probability of selecting a sample mean that is at most equal to 8

Question 7

An article states that a sample of 40 participants took 12 ± 2.3 (M ± SEM) seconds to complete a cognitive assessment. Which value is the standard error of the mean?                                

a. 40

b. 12

c. 2.3

d. The standard error of the mean is not reported in the article.

Question 8

A method for testing a claim or hypothesis about a parameter in a population, using data measured in a sample, is called                                               

a. random sampling.

b. level of significance.

 c. hypothesis testing.

d. guessing.

Question 9

A researcher directly controls for the probability of a ______, but does not directly control for the probability of a ______.                                               

a. Type I error; alpha level

b. Type II error; beta level

 c. Type I error; Type II error

d. Type II error; Type I error

Question 10

Given the following values: μ = 6.0, M = 7.6, n = 36, σ = 6, conduct a one-sample z test at a .05 level of significance. For a one-tailed test, upper-tail critical, what is the decision?                                

a. to reject the null hypothesis

 b. to retain the null hypothesis

c. There is not enough information since the sample size is not given.

d. none of the above

Question 11

A researcher obtains z = 3.98 for a one-sample z test. If her decision is to retain the null hypothesis, then what do you know about her decision?                                       

a. Her decision was inconclusive.

b. Her decision was based on a two-tailed test.

c. Her decision was inconclusive and her decision was based on a two-tailed test.

d. Her decision resulted in a Type III error.

Question 12

Based on the effect size conventions, d = 0.60 is a                                           

a. small effect size.

 b. medium effect size.

c. large effect size.

d. none of the above

Question 13

A researcher conducts a study but has low power to detect an effect. Which of the following is one way in which the research can increase power?                                   

a. make the alpha level smaller

b. increase the sample size

c. study a population with a larger standard deviation

d. conduct the study again with the same sample size

Question 14

A researcher reports that the size of an effect in some population is d = 0.88. Which of the following is an appropriate interpretation for d?                                     

a. The effect observed in the population was significant.

b. Mean scores were significant by 0.88 points in the sample.

c. Mean scores were significant by 0.88 points in the population.

d. Mean scores shifted 0.88 standard deviations in the population.

Question 15

Is a one-sample z test reported differently for one-tailed and two-tailed tests?                                

a. No, the same values are reported.

b. It depends on whether the results were significant.

c. Yes, only significant results for a two-tailed test are reported.

d. It can be reported differently when the effect size is large.

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