1. What are null hypothesis and alternative hypothesis?
2. Inastatisticaltest,wehavethechoiceofatwo-tailedtest,aleft- tailed test, or a right-tailed test. Which hypothesis is the determining factor for choosing the direction of the test? (In other words, how would you decide it)
3. Forthesamesampledataandnullhypothesis,howdoesthe P-value for a two-tailed test compare to that for a one-tailed test?
4. Using P-value method, how would you reject or fail to reject the null hypothesis? (what is the decision criteria?) How does level of significance matter to the hypothesis testing?
5. If the P-value is such that you can reject Ho at the 5% level of significance, can you always reject Ho at the 1% level? Explain.
6. What do we mean when we say the data used in a statistical test are significant?
7. In class we mentioned: “If you are conducting a study and want to use a hypothesis test to support your claim, the claim must be worded so that it becomes the alternative hypothesis”. Please Explain.
8. In hypothesis testing, why it is more appropriate to use “Fail to reject to H0” instead of “Accept H0”?
9. What is test statistics? Calculating a test statistics will vary, please list one example here.
10.Explain the type I and type II error.
11. Describe the general steps to use traditional Critical Region methods.
1. What are null hypothesis and alternative hypothesis? 2. Inastatisticaltest,wehavethechoiceofatwo-tailedtest,aleft- tailed test, or a right-tailed test. Which hypothesis is the determining factor fo...
(a) Suppose the null and alternative hypothesis of a test are: H0: μ= 9.7 H1: μ >9.7 Then the test is: left-tailed two-tailed right-tailed (b) If you conduct a hypothesis test at the 0.02 significance level and calculate a P-value of 0.07, then what should your decision be? Fail to reject H0 Reject H0 Not enough information is given to make a decision
Identify the null hypothesis, alternative hypothesis, P-value, conclusion about the null hypothesis, and final conclusion that addresses the original claim. Test the claim about the population mean u at the level of significance a. Assume the population is normally distributed. Claim:us 45; a = 0.01; 0 = 4.3 Sample statistics: x = 46.8, n = 40 Fail to reject Ho. There is enough evidence at the 1% level of significance to support the claim. Reject Ho. There is enough evidence...
(a) For the same data and null hypothesis, is the P-value of a one-tailed test (right or left) larger or smaller than that of a two-tailed test? pick one The P-value for a one-tailed test is smaller because the two-tailed test includes the area in both tails. The P-value for a one-tailed test is larger because the two-tailed test includes the area in only one tail. The P-value for a one-tailed test is larger because the two-tailed test includes the...
Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null hypothesis, and final conclusion that addresses the original claim. A test of sobriety involves measuring the subject's motor skills. A study of n = 20 randomly selected sober subjects take the test and produce a mean score of X = 41.0, and we know that o = 3.7. At the 0.01 level of significance, test the claim that the true mean score for all sober subjects is...
Question 7 3 pts Provide the following information: A. Identify the hypothesis test as being two-tailed, left-tailed, or right-tailed. B. Find the p-value to within 3 decimal places. C. Using a significance level of a = 0.05, do we reject Ho or fail to reject Ho? The test statistic of z=0.20 is obtained when testing the claim that p 2 0.39. A. Tail: two, left or right B. P-value: C. Reject or Fail to Reject the null HTML Editora
Question 6 3 pts Provide the following information: A. Identify the hypothesis test as being two-tailed, left-tailed, or right-tailed. B. Find the p-value to within 3 decimal places. C. Using a significance level of a = 0.05, do we reject Ho or fail to reject Ho? The test statistic of z = -2.50 is obtained when testing the claim that p < 0.75. A. Tail: two, left or right B. P-value: C. Reject or Fail to Reject the null HTML...
A hypothesis test is conducted to test the null hypothesis that the mean is less than 12. Use a 0.01 level of significance. What type of test is this? Right tail Two tail Left tail What is the critical value? 2.33 -2.33 1.78 correct answer is not given Suppose the test statistic was -2.50 What is the conclusion? Fail to reject Ho. There is not sufficent evidence to support the claim that the mean is less than 12. Reject Ho....
Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null hypothesis, and final conclusion that addresses the original claim. Use the P-value method. Use the normal distribution as an approximation of the binomial distribution. 7. In a recent poll of 745 randomly selected adults, 585 said that it is morally wrong to not report all income on tax returns. Use a 0.01 significance level report all income on tax returns. Identify the null hypothesis, altemative hypothesis, test...
Hypothesis Problems For the following hypothesis tests: a. State the null (Ho) and alternative (Hi) hypotheses b. State the type of test (right-tailed, left-tailed, or two-tailed) c. State the multiplier for an a (level of significance) of .05. The Chamber of Commerce states that only 15% of Boston tourists stay more than 2 days. A new chamber employee feels that the percentage staying more than 2 days is greater than 15%, and plans to sample a set of tourists to...
The null and alternative hypotheses are given. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed. What parameter is being tested? H0: p = 0.4 H1: p > 0.4 What type of test is being conducted in this problem? Left-tailed test Two-tailed test Right-tailed test . What parameter is being tested? Population Mean Population Proportion Population standard deviation