MATH 120: Introduction to Statistics Lime Spring Week 7 Quiz 2023

MATH 120: Introduction to Statistics Lime Spring Week 7 Quiz 2023 1. What is the impact of changing from the 90% confidence interval to the 99% confidence interval? A: The range of values included increases. 2. What does decreasing the standard deviation of the sample do to the confidence interval? A: The range of values included decreases. 3. What is the impact of decreasing the sample size? A: The range of values included increases. 4. Which accurately describes widening the range of the confidence interval (by changing the confidence level)? A: The range is wider so the certainty is higher. 5. A delivery company provides expected time of arrival. The company wants to provide an accurate suggestion with a 90% confidence level. If the sample size is 50, the sample average is 35 minutes, the standard deviation is 10 minutes, and the z-score is 1.65, what is the standard error of the mean? A: 1.41. 6. A delivery company provides expected time of arrival. The company wants to provide an accurate suggestion with a 90% confidence level. If the sample size is 50, the sample average is 35 minutes, the standard deviation is 10 minutes, and the z-score is 1.65, what is the margin of error? A: 2.33 7. A delivery company provides expected time of arrival. The company wants to provide an accurate suggestion with a 90% confidence level. If the sample size is 50, the sample average is 35 minutes, the standard deviation is 10 minutes, and the z-score is 1.65, what is the confidence interval? A: (32.67, 37.33). 8. A pharmaceutical company is launching a new medication intended to treat epilepsy. Which of the following would make sense as a null hypothesis when testing the efficacy of the drug? A: H{0}$: The drug is not an effective treatment for epilepsy. 9. A pharmaceutical company is launching a new medication intended to treat epilepsy. The company performs a study that maintains the null hypothesis. What is the finding of the company? A: The evidence suggests that the drug is not an effective treatment against epilepsy. 10. A supplier of parts to the automobile industry is launching a new brake pad intended to wear down more slowly while delivering the same performance. The company performs a study that incorrectly rejects the null hypothesis. What type of error is this? A: Type 1: The supplier rejected the null when it should not have