1-Why is the null hypothesis typically written as the " no change " case? 2-Define degrees...
1-Why is the null hypothesis typically written as the " no change " case?
2-Define degrees of freedom and explain why it is important ?
3-Describe what a joint probability distribution tell us?
Homework Answers
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1-Why is the null hypothesis typically written as the " no
change " case?
2-Define degrees...
1. For a T distribution with 10 degrees of freedom, what is the probability P(T < -1.372)? 1. We ...
1. For a T distribution with 10 degrees of freedom, what is the probability P(T < -1.372)? 1. We consider a sample of 11 being used in a hypothesis test. In a two-sided hypothesis test where we reject if the value of |To| > Ta/2 is -2.05. Do you reject the null hypothesis in this case (explain why)? What is the p- value in this case (you may use a range for the p-value)? 2. This time a sample size...
Suppose you test null hypothesis Ho : μι_Ha versus Ha : μ.μ2 , software gives 12.3 degrees of fre...
suppose you test null hypothesis Ho : μι_Ha versus Ha : μ.μ2 , software gives 12.3 degrees of freedom for your t test. Answer the following questions: a) If test statistics t-2.25 5, use the rejection region to decide if Ho be rejected or not at a .0.05? Include a sketch, clearly label critical value(s) and rejection and nonrejection regions. b) If test statistics was t-1.14, use a 0.05, compute the p-value and decide if Ho b rejected or not...
STEP 2 State the Null and Alternative (Research) hypotheses NULL Hypothesis ALTERNATIVE Hypothesis Is this a...
STEP 2 State the Null and Alternative (Research) hypotheses NULL Hypothesis ALTERNATIVE Hypothesis Is this a one or two tailed test (if a one tailed test, what direction)? STEP 3 Define the elements of the problem What is the population or populations of interest? What is the sample? 3. The President claims that 100,000 jobs were created last month. You don't believe this claim is true, so you examine a sample of 1,000 records from the Bureau of Labor Statistics...
(20) 1. Complete the ANOVA table (9 points), state the null and alternate hypothesis in symbols...
(20) 1. Complete the ANOVA table (9 points), state the null and alternate hypothesis in symbols and in words (6 points). Copy the results using technology and use words to describe how f relates to the p value and what the results indicate (5 points). Girls from four different soccer teams are to be tested for mean goals scored per game. The entries in the table are the goals per game for the different teams as shown in the table...
Discuss the five steps in hypothesis testing, citing examples where necessary. Define null and research hypotheses....
Discuss the five steps in hypothesis testing, citing examples where necessary. Define null and research hypotheses. Explain how to prepare data for hypothesis testing. Describe exploratory data analysis as a prelude to hypothesis testing. Distinguish between Type I and II errors. What are the implications of each?
13. Explain why the null hypothesis Upper H 0 : mu 1 equals mu 2 is...
13. Explain why the null hypothesis Upper H 0 : mu 1 equals mu 2 is equivalent to the null hypothesis Upper H 0 : mu 1 minus mu 2 equals 0. Choose the correct answer below. A. They are equivalent through algebraic manipulation. B. They are equivalent because the null hypothesis, Upper H 0, is always assumed to be true. C. By definition, the null hypothesis is always equal to 0. Therefore, these hypotheses are equivalent. D. The values...
11. What is the null hypothesis for a t-test for two independent groups? a. If mul...
11. What is the null hypothesis for a t-test for two independent groups? a. If mul and mu2 are the population means of the two groups, then the null hypothesis is Ho: mul-mu2=0. b. If sl and s2 are the population standard deviations of the two groups, then the null hypothesis is Ho: sl-s2=0. 12. Differentiate between a data set that should be analyzed using a paired t-test from a data set that should be analyzed using a t-test for...
1. a What is a hypothesis test? What is it used for? How are the null...
1. a What is a hypothesis test? What is it used for? How are the null and alternative hypothesis determined? . What are the 3 ways to set up hypotheses? C. Why can't we "accept” a null hypothesis? d. How do we determine if we reject or fail to reject a nuil hypothesis? e. What are the key pieces needed when writing a conclusion? f. Describe the difference between statistically significant and practically significant.
(1 point) Use software to test the null hypothesis of whether there is a relationship between...
(1 point) Use software to test the null hypothesis of whether there is a relationship between the two classifications, A and B, of the 3 x 3 contingency table shown below. Test using a0.05. NOTE: You may do this by hand, but it will take a bit of time. B1 B2 By Total Ai 73 55 42 170 A2 70 74 47 191 Аз 69174 79222 Total 212 203 168 583 (b) Find the degrees of freedom. (c) Find the...
(3 points) Suppose that you're going to do a test of significance with null hypothesis 30...
(3 points) Suppose that you're going to do a test of significance with null hypothesis 30 and alternative hypothesis 30 You take a sample of size 88 and compute the sample mean I assume that the population standard deviation of the variable is o 7.1 and that the sampling distribution of the sample mean is normal a if you carry a hypothesis test with significance level 05, what values of will cause us to reject the null hypothesis in favor...
1. For a T distribution with 10 degrees of freedom, what is the probability P(T < -1.372)? 1. We consider a sample of 11 being used in a hypothesis test. In a two-sided hypothesis test where we reject if the value of |To| > Ta/2 is -2.05. Do you reject the null hypothesis in this case (explain why)? What is the p- value in this case (you may use a range for the p-value)? 2. This time a sample size...
suppose you test null hypothesis Ho : μι_Ha versus Ha : μ.μ2 , software gives 12.3 degrees of freedom for your t test. Answer the following questions: a) If test statistics t-2.25 5, use the rejection region to decide if Ho be rejected or not at a .0.05? Include a sketch, clearly label critical value(s) and rejection and nonrejection regions. b) If test statistics was t-1.14, use a 0.05, compute the p-value and decide if Ho b rejected or not...
STEP 2 State the Null and Alternative (Research) hypotheses NULL Hypothesis ALTERNATIVE Hypothesis Is this a one or two tailed test (if a one tailed test, what direction)? STEP 3 Define the elements of the problem What is the population or populations of interest? What is the sample? 3. The President claims that 100,000 jobs were created last month. You don't believe this claim is true, so you examine a sample of 1,000 records from the Bureau of Labor Statistics...
11. What is the null hypothesis for a t-test for two independent groups? a. If mul and mu2 are the population means of the two groups, then the null hypothesis is Ho: mul-mu2=0. b. If sl and s2 are the population standard deviations of the two groups, then the null hypothesis is Ho: sl-s2=0. 12. Differentiate between a data set that should be analyzed using a paired t-test from a data set that should be analyzed using a t-test for...
1. a What is a hypothesis test? What is it used for? How are the null and alternative hypothesis determined? . What are the 3 ways to set up hypotheses? C. Why can't we "accept” a null hypothesis? d. How do we determine if we reject or fail to reject a nuil hypothesis? e. What are the key pieces needed when writing a conclusion? f. Describe the difference between statistically significant and practically significant.
(1 point) Use software to test the null hypothesis of whether there is a relationship between the two classifications, A and B, of the 3 x 3 contingency table shown below. Test using a0.05. NOTE: You may do this by hand, but it will take a bit of time. B1 B2 By Total Ai 73 55 42 170 A2 70 74 47 191 Аз 69174 79222 Total 212 203 168 583 (b) Find the degrees of freedom. (c) Find the...
(3 points) Suppose that you're going to do a test of significance with null hypothesis 30 and alternative hypothesis 30 You take a sample of size 88 and compute the sample mean I assume that the population standard deviation of the variable is o 7.1 and that the sampling distribution of the sample mean is normal a if you carry a hypothesis test with significance level 05, what values of will cause us to reject the null hypothesis in favor...
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