Download Quiz 4 for BusStat 207: Statistical Procedures and Hypothesis Testing and more Quizzes Introduction to Business Management in PDF only on Docsity! BusStat 207 Name_____________________ Summer 2009 Quiz 4 Directions: Write your answer in the space provided. Use + for true and 0 for false. ___1. Hypothesis testing and confidence interval estimation are essentially two totally different statistical procedures and share little in common with each other. ___2. When the decision maker has control over the null and alternative hypotheses, the alternative hypotheses should be the “research” hypothesis. ___3. A sample is used to obtain a 95% confidence interval for the mean of a population. The confidence interval goes from 15 to 19. If the same sample had been used to test the null hypothesis that the mean of the population is equal to 20 versus the alternative hypothesis that the mean of the population differs from 20, the null hypothesis could be rejected at a level of significance of 0.05. ___4. When someone is on trial for suspicion of committing a crime, the hypotheses are: Ho : innocent HA : guilty Which of the following is correct? a. Type I error is acquitting a guilty person b. Type I error is convicting an innocent person c. Type II error is acquitting an innocent person d. Type II error is convicting an innocent person ___5. Which of the following statements is true? a. The decision maker controls the probability of making a Type I statistical error. b. Alpha represents the probability of making a Type II error. c. Alpha and beta are directly related such that when one is increased the other will increase also. d. The alternative hypothesis should contain the equality. ___6. Which of the following would be an appropriate null hypothesis? a. The mean of a population is equal to 55. b. The mean of a sample is equal to 55. c. The mean of a population is greater than 55. d. The mean of a sample is equal to 55 ___7. If the p value is less than α in a two-tailed test, a. the null hypothesis should not be rejected. b. the null hypothesis should be rejected. c. a one-tailed test should be used. d. more information is needed to reach a conclusion about the null hypothesis. ___8. A company that makes shampoo wants to test whether the average amount of shampoo per bottle is 16 ounces. The standard deviation is known to be 0.20 ounces. Assuming that the hypothesis test is to be performed using 0.10 level of significance and a random sample of n = 64 bottles, which of the following would be the correct formulation of the null and alternative hypotheses? a. Ho : x = 16 HA : x ≠ 16 b. Ho : μ = 16
