Question 1

When is a one-tailed test used?

Accepted Answer

A) When no relationship is predicted 
B) When a relationship is predicted and the direction in which the scores will change is predicted 
C) When the demonstrated relationship is predicted 
D) When a relationship is predicted without stating the direction in which the scores will change 
A) When no relationship is predicted 
B) When a relationship is predicted and the direction in which the scores will change is predicted 
C) When the demonstrated relationship is predicted 
D) When a relationship is predicted without stating the direction in which the scores will change B

Question 2

How would you report a nonsignificant z-obtained value of -.50 in a journal article?

Accepted Answer

A) z = -.50, p > .05 
B) z = -.50, p  .05 
D) z = -.50, p > .50 
A) z = -.50, p > .05 
B) z = -.50, p  .05 
D) z = -.50, p > .50 A

Question 3

What is the relationship between N and power?

Accepted Answer

A larger N produces greater power.

Question 4

Which of the following is correct regarding experimental hypotheses?

Accepted Answer

A) We can prove a predicted relationship exists in a population by confirming an experimental hypothesis. 
B) They describe the population parameters to be tested by the experiment. 
C) They describe the predicted relationship we may or may not find in an experiment. 
D) We can prove theories about behavior by confirming experimental hypotheses. 
A) We can prove a predicted relationship exists in a population by confirming an experimental hypothesis. 
B) They describe the population parameters to be tested by the experiment. 
C) They describe the predicted relationship we may or may not find in an experiment. 
D) We can prove theories about behavior by confirming experimental hypotheses.

Question 5

What happens to the probability of committing a Type I error if the level of significance is changed from α = .01 to α = .05?

Accepted Answer

A) The probability of committing a Type I error will decrease. 
B) The probability of committing a Type I error will increase. 
C) The probability of committing a Type I error will remain the same. 
D) The change in probability will depend on your sample size. 
A) The probability of committing a Type I error will decrease. 
B) The probability of committing a Type I error will increase. 
C) The probability of committing a Type I error will remain the same. 
D) The change in probability will depend on your sample size.

Question 6

Which of the following statements does not belong

Accepted Answer

A) Our condition of the independent variable produced a significant difference in the dependent scores. 
B) The change in the dependent scores was produced by significant sampling error. 
C) We obtained a significant z. 
D) There is a significant effect of the condition. 
A) Our condition of the independent variable produced a significant difference in the dependent scores. 
B) The change in the dependent scores was produced by significant sampling error. 
C) We obtained a significant z. 
D) There is a significant effect of the condition.

Question 7

Which of the following is correct regarding alternative hypotheses?

Accepted Answer

A) They are alternatives to the experimental hypotheses. 
B) They state the predicted relationship if the sample statistic does not fall in the region of rejection. 
C) They describe the population parameters represented by the sample data if the predicted relationship exists. 
D) They describe the population parameters represented by the sample data if the predicted relationship does not exist. 
A) They are alternatives to the experimental hypotheses. 
B) They state the predicted relationship if the sample statistic does not fall in the region of rejection. 
C) They describe the population parameters represented by the sample data if the predicted relationship exists. 
D) They describe the population parameters represented by the sample data if the predicted relationship does not exist.

Question 8

Which of the following is correct regarding statistical hypotheses null hypothesis and alternative hypothesis)?

Accepted Answer

A) They describe the population parameters our sample data represent if there is or is not a predicted relationship. 
B) They describe the sample data if there is or is not a relationship in the population. 
C) We can prove a relationship exists in the population by confirming these hypotheses. 
D) They are the hypotheses we perform on the statistics in our experiment. 
A) They describe the population parameters our sample data represent if there is or is not a predicted relationship. 
B) They describe the sample data if there is or is not a relationship in the population. 
C) We can prove a relationship exists in the population by confirming these hypotheses. 
D) They are the hypotheses we perform on the statistics in our experiment.

Question 9

What does the statement "p < .05" tell us in regards to a Type I error?

Accepted Answer

The probability of a

Question 10

If the difference between your sample mean and the known population mean is 1.961, and your population standard deviation is 5, how big of a sample size would you need to get a significant result using α = .05 and a two-tailed test?

Accepted Answer

25 since @#LAT-DLM&

Question 11

For $\alpha$ $H_{0}: \mu \geq 22, H_{a}: \mu<22, \bar{X}=25, \sigma=5, N=9$ and = .05, what is the appropriate outcome of a z- test?

Accepted Answer

The answer of For $\alpha$ \(H_{0}: \mu \geq 22, H_{a}:...

Question 12

Which of the following tests is considered to be more powerful?

Accepted Answer

A) A one-tailed test 
B) A two-tailed test 
C) Neither; they are both equally statistically powerful 
D) Which is more powerful depends on the sample size 
A) A one-tailed test 
B) A two-tailed test 
C) Neither; they are both equally statistically powerful 
D) Which is more powerful depends on the sample size

Question 13

Suppose a researcher develops a drug designed to promote sleep.Those who take this drug, on average, sleep for
8.1 hours per night whereas those who do not take it sleep for 7.5 hours per night.In the context of this study, what would the alternative hypothesis suggest?

Accepted Answer

The alternative hypothesis wou

Question 14

To determine whether a new drug designed to lower a person's heart rate is effective or not, Dr.Johnson gives the medicine to a random sample of 100 patients with Rapid Heart Rhythm RHR) and obtains a sample mean of 128.Dr.Johnson knows the heart rate of the population of individuals with RHR is 135 with $\sigma_{X}=40$ .If Dr.Johnson uses a one-tailed test and α = .05, what is the appropriate conclusion?

Accepted Answer

@#LAT-DLM& .Reject @#LAT-DLM&

Question 15

The Physical Fitness Test National Level for Girls) shows the national average for 10­year­old girls on "right­angle push­ups" to be μ = 13.Principal Smyth hypothesizes her girls at Strong School are significantly above the national mean.If the $z_{c r i t}=-1.645, z_{o b t}=-2.0$ $H_{0}$ $H_{a}$ $\sigma_{X}$ = 6 and the scores for nine girls are as reported here, compute $Z_{a b t}$ and determine if Principal Smyth is right.Use α = .05.
14 16 18 16 12 16 17 20 15

Accepted Answer

@#LAT-DLM& = 1.5 so

Question 16

The population mean for the Elementary Tenacity Test ETT) is 150 with $\sigma_{x}=25$ A recent study of elementary school children participating in a school lunch program obtained the following ETT scores.Use a two-tailed z-test and $\alpha=0.05$

Accepted Answer

The answer of The population mean for the Elementary Tenacity...

Question 17

If $Z_{a b t}$ = +2.21, do you reject $H_{0}$ or fail to reject $H_{0}$ using a two-tailed test with α = .01?

Accepted Answer

The answer of If $Z_{a b t}$ = +2.21, do...

Question 18

If you have and $\bar{X}=17, \mu=21, \sigma=9$ $N=16$, conduct a two-tailed z-test.Use α = .05.Be sure to set up your hypotheses and rejection region, calculate your z-score, and state your decision.

Accepted Answer

Fail to reject the null hypoth

Question 19

Given $\bar{X}=115, \mu=119, \sigma=20$ and $N=144$, conduct a two-tailed z-test.Use α = .05.Be sure to set up your hypotheses and rejection region, calculate your z-score, and state your decision.

Accepted Answer

Reject the null hypo

Question 20

Which of the following assumptions are common to all parametric statistics?

Accepted Answer

A) There are no common assumptions. 
B) The population of dependent scores forms a normal distribution, regardless of what kind of scores they are. 
C) The dependent scores must be interval or ratio scores, regardless of whether the population of scores forms a normal distribution. 
D) The population of dependent scores a) must be interval or ratio scores and b) must form an approximately normal distribution. 
A) There are no common assumptions. 
B) The population of dependent scores forms a normal distribution, regardless of what kind of scores they are. 
C) The dependent scores must be interval or ratio scores, regardless of whether the population of scores forms a normal distribution. 
D) The population of dependent scores a) must be interval or ratio scores and b) must form an approximately normal distribution.

When is a one-tailed test used?

How would you report a nonsignificant z-obtained value of -.50 in a journal article?

What is the relationship between N and power?

Which of the following is correct regarding experimental hypotheses?

What happens to the probability of committing a Type I error if the level of significance is changed from α = .01 to α = .05?

Which of the following statements does not belong

Which of the following is correct regarding alternative hypotheses?

Which of the following is correct regarding statistical hypotheses null hypothesis and alternative hypothesis)?

What does the statement "p < .05" tell us in regards to a Type I error?

If the difference between your sample mean and the known population mean is 1.961, and your population standard deviation is 5, how big of a sample size would you need to get a significant result using α = .05 and a two-tailed test?

For $\alpha$ $H_{0}: \mu \geq 22, H_{a}: \mu<22, \bar{X}=25, \sigma=5, N=9$ and = .05, what is the appropriate outcome of a z- test?

Which of the following tests is considered to be more powerful?

Suppose a researcher develops a drug designed to promote sleep.Those who take this drug, on average, sleep for 8.1 hours per night whereas those who do not take it sleep for 7.5 hours per night.In the context of this study, what would the alternative hypothesis suggest?

If $Z_{a b t}$ = +2.21, do you reject $H_{0}$ or fail to reject $H_{0}$ using a two-tailed test with α = .01?

If you have and $\bar{X}=17, \mu=21, \sigma=9$ $N=16$ , conduct a two-tailed z-test.Use α = .05.Be sure to set up your hypotheses and rejection region, calculate your z-score, and state your decision.

Given $\bar{X}=115, \mu=119, \sigma=20$ and $N=144$ , conduct a two-tailed z-test.Use α = .05.Be sure to set up your hypotheses and rejection region, calculate your z-score, and state your decision.

Which of the following assumptions are common to all parametric statistics?

Introduction to Statistics and Research

Creating and Using Frequency Distributions

Summarizing Scores With Measures of Central Tendency

Summarizing Scores With Measures of Variability

Describing Data With Z-Scores and the Normal Curve

Using Probability to Make Decisions About Data

Hypothesis Testing Using the One-Sample T-Test

Hypothesis Testing Using the Two-Sample T-Test

Describing Relationships Using Correlation and Regression

Hypothesis Testing Using the One-Way Analysis of Variance

Understanding the Two-Way Analysis of Variance

Chi Square and Nonparametric Procedures

Filters

Exam 7: Overview of Statistical Hypothesis Testing: the Z-Test

When is a one-tailed test used?

How would you report a nonsignificant z-obtained value of -.50 in a journal article?

What is the relationship between N and power?

Which of the following is correct regarding experimental hypotheses?

What happens to the probability of committing a Type I error if the level of significance is changed from α = .01 to α = .05?

Which of the following statements does not belong

Which of the following is correct regarding alternative hypotheses?

Which of the following is correct regarding statistical hypotheses null hypothesis and alternative hypothesis)?

What does the statement "p < .05" tell us in regards to a Type I error?

If the difference between your sample mean and the known population mean is 1.961, and your population standard deviation is 5, how big of a sample size would you need to get a significant result using α = .05 and a two-tailed test?

For α\alphaα H0:μ≥22,Ha:μ<22,Xˉ=25,σ=5,N=9H_{0}: \mu \geq 22, H_{a}: \mu<22, \bar{X}=25, \sigma=5, N=9H0​:μ≥22,Ha​:μ<22,Xˉ=25,σ=5,N=9 and = .05, what is the appropriate outcome of a z- test?

Which of the following tests is considered to be more powerful?

Suppose a researcher develops a drug designed to promote sleep.Those who take this drug, on average, sleep for 8.1 hours per night whereas those who do not take it sleep for 7.5 hours per night.In the context of this study, what would the alternative hypothesis suggest?

The population mean for the Elementary Tenacity Test ETT) is 150 with σx=25\sigma_{x}=25σx​=25 A recent study of elementary school children participating in a school lunch program obtained the following ETT scores.Use a two-tailed z-test and α=0.05\alpha=0.05α=0.05

If ZabtZ_{a b t}Zabt​ = +2.21, do you reject H0H_{0}H0​ or fail to reject H0H_{0}H0​ using a two-tailed test with α = .01?

If you have and Xˉ=17,μ=21,σ=9\bar{X}=17, \mu=21, \sigma=9Xˉ=17,μ=21,σ=9 N=16N=16N=16 , conduct a two-tailed z-test.Use α = .05.Be sure to set up your hypotheses and rejection region, calculate your z-score, and state your decision.

Given Xˉ=115,μ=119,σ=20\bar{X}=115, \mu=119, \sigma=20Xˉ=115,μ=119,σ=20 and N=144N=144N=144 , conduct a two-tailed z-test.Use α = .05.Be sure to set up your hypotheses and rejection region, calculate your z-score, and state your decision.

Which of the following assumptions are common to all parametric statistics?

Introduction to Statistics and Research

Creating and Using Frequency Distributions

Summarizing Scores With Measures of Central Tendency

Summarizing Scores With Measures of Variability

Describing Data With Z-Scores and the Normal Curve

Using Probability to Make Decisions About Data

Hypothesis Testing Using the One-Sample T-Test

Hypothesis Testing Using the Two-Sample T-Test

Describing Relationships Using Correlation and Regression

Hypothesis Testing Using the One-Way Analysis of Variance

Understanding the Two-Way Analysis of Variance

Chi Square and Nonparametric Procedures

Filters

For $\alpha$ $H_{0}: \mu \geq 22, H_{a}: \mu<22, \bar{X}=25, \sigma=5, N=9$ and = .05, what is the appropriate outcome of a z- test?

If $Z_{a b t}$ = +2.21, do you reject $H_{0}$ or fail to reject $H_{0}$ using a two-tailed test with α = .01?

If you have and $\bar{X}=17, \mu=21, \sigma=9$ $N=16$ , conduct a two-tailed z-test.Use α = .05.Be sure to set up your hypotheses and rejection region, calculate your z-score, and state your decision.

Given $\bar{X}=115, \mu=119, \sigma=20$ and $N=144$ , conduct a two-tailed z-test.Use α = .05.Be sure to set up your hypotheses and rejection region, calculate your z-score, and state your decision.