Basicly, the students cannot understand him so we band together to try to work out problems by ourselves. This is not homework, it is just a review for a test.
Can someone please help me?
I need someone to attempt to do some of these problems if they know how and explain alittle.
I would really appreciate it.
Here it is for those who want to help:
Statistics for the Behavioral Sciences
Practice Exam II (Extra)
For the questions below, answer the following questions: What kind of test would you use? Would you use a one-tailed or two-tailed test? If a one-tailed test, which direction you will use?
Options for type of test: (20 points)
a. Z-test of an observation
b. Z-test of a mean in one sample
c. T-test of a mean in one sample
d. T-test of the difference in means from independent samples
e. T-test of the difference in means from a dependent sample.
I. You want to test whether the mean of the SAT scores for your students differs from the national average. You know the mean and standard deviation for the national SAT with m = 500 and s =100.
II. You are looking at the scores on the final exam in a large course, and notice that the full-time students seemed to score higher than the part-time students, and you want to know if it is a significant difference.
III. You are teaching a class and you give the students a test. The information you have is the student's score (one student), and the national mean and standard deviation for the test. You just wanted to know this student?s performance is better compared to the national norm.
IV. A sample of n = 16 individuals is selected from a population that forms a normal distribution with m = 40. A treatment is administered to the sample, and after treatment, the sample is measured to evaluate the effect of the treatment.
Z-scores and Normal Distributions
1. Calculate and interpret Z-scores.
2. Know the characteristics of Z-scores.
3. Know how to convert a Z-score into an raw score if given the mean, the standard deviation, and the Z-score.
4. Know the characteristics of normal distributions.
5. Know the characteristics of the standard normal distribution (Z-score distribution).
6. Find the probability associated with a particular range of scores using a Z-score transformation and the standard normal distribution table (Z-score distribution)
Distribution of Sample Means
1. Be able to describe how the sample mean relates to the population mean (i.e., bias, consistent, efficient, resistant?).
2. Be able to describe how the sample variance relates to the population variance ?
3. Be able to determine the expected value of the sample mean when given information about the population.
4. Be able to determine the standard error of the sample mean when given information about the population.
5. Be able to determine the shape of the Distribution of the Sample Means.
6. What is the Central Limit Theorem?
7. Find the probability of obtaining a range of sample means using a Z-score transformation and the standard normal distribution table when given information about the population.
One Sample Z test (Hypothesis Testing)
If given a research scenario, be able to use the One Sample Z test to test the null hypothesis.
1. Identify the null and alternative hypotheses.
2. Identify the alpha level and determine the critical value(s).
3. Calculate the statistical test.
4. Determine the significance of the statistical test by comparing it to the critical value(s).Write a sentence that explains your results. This will be graded for accuracy as well as format.
One Sample t test
1. How does the formula for the one sample t test differ from the formula for the one sample Z test?
2. What impact does using the sample variance instead of the population variance have on the statistical test?
3. How do the standard normal distribution and the t distributions compare?
4. What are the assumptions of the one sample t test? If a particular assumption is not true, what effect does this have on the use of the one sample t test?
If given a research scenario, be able to use the One Sample t test to test the null hypothesis. (Similar to one sample Z test)
1. Identify the null and alternative hypotheses.
2. Identify the alpha level and determine the critical value(s).
I would really appreciate any help.
TIA
Can someone please help me?
I need someone to attempt to do some of these problems if they know how and explain alittle.
I would really appreciate it.
Here it is for those who want to help:
Statistics for the Behavioral Sciences
Practice Exam II (Extra)
For the questions below, answer the following questions: What kind of test would you use? Would you use a one-tailed or two-tailed test? If a one-tailed test, which direction you will use?
Options for type of test: (20 points)
a. Z-test of an observation
b. Z-test of a mean in one sample
c. T-test of a mean in one sample
d. T-test of the difference in means from independent samples
e. T-test of the difference in means from a dependent sample.
I. You want to test whether the mean of the SAT scores for your students differs from the national average. You know the mean and standard deviation for the national SAT with m = 500 and s =100.
II. You are looking at the scores on the final exam in a large course, and notice that the full-time students seemed to score higher than the part-time students, and you want to know if it is a significant difference.
III. You are teaching a class and you give the students a test. The information you have is the student's score (one student), and the national mean and standard deviation for the test. You just wanted to know this student?s performance is better compared to the national norm.
IV. A sample of n = 16 individuals is selected from a population that forms a normal distribution with m = 40. A treatment is administered to the sample, and after treatment, the sample is measured to evaluate the effect of the treatment.
Z-scores and Normal Distributions
1. Calculate and interpret Z-scores.
2. Know the characteristics of Z-scores.
3. Know how to convert a Z-score into an raw score if given the mean, the standard deviation, and the Z-score.
4. Know the characteristics of normal distributions.
5. Know the characteristics of the standard normal distribution (Z-score distribution).
6. Find the probability associated with a particular range of scores using a Z-score transformation and the standard normal distribution table (Z-score distribution)
Distribution of Sample Means
1. Be able to describe how the sample mean relates to the population mean (i.e., bias, consistent, efficient, resistant?).
2. Be able to describe how the sample variance relates to the population variance ?
3. Be able to determine the expected value of the sample mean when given information about the population.
4. Be able to determine the standard error of the sample mean when given information about the population.
5. Be able to determine the shape of the Distribution of the Sample Means.
6. What is the Central Limit Theorem?
7. Find the probability of obtaining a range of sample means using a Z-score transformation and the standard normal distribution table when given information about the population.
One Sample Z test (Hypothesis Testing)
If given a research scenario, be able to use the One Sample Z test to test the null hypothesis.
1. Identify the null and alternative hypotheses.
2. Identify the alpha level and determine the critical value(s).
3. Calculate the statistical test.
4. Determine the significance of the statistical test by comparing it to the critical value(s).Write a sentence that explains your results. This will be graded for accuracy as well as format.
One Sample t test
1. How does the formula for the one sample t test differ from the formula for the one sample Z test?
2. What impact does using the sample variance instead of the population variance have on the statistical test?
3. How do the standard normal distribution and the t distributions compare?
4. What are the assumptions of the one sample t test? If a particular assumption is not true, what effect does this have on the use of the one sample t test?
If given a research scenario, be able to use the One Sample t test to test the null hypothesis. (Similar to one sample Z test)
1. Identify the null and alternative hypotheses.
2. Identify the alpha level and determine the critical value(s).
I would really appreciate any help.
TIA
