MATH 120: INTRODUCTION TO STATISTICS WEEK 7 EXAM 2023/2024/100% CORRECT /A+ GRADE ASSURED

What is the impact of changing from the 90% confidence interval to the 99% confidence interval? The range of values included increases. The range of values included decreases. The range of values included stays the same. It cannot be determined from the information provided. 2. What does decreasing the standard deviation of the sample do to the confidence interval? The range of values included increases. The range of values included decreases. The range of values included stays the same. It cannot be determined from the information provided. 3. What is the impact of decreasing the sample size? The range of values included increases. The range of values included decreases. The range of values included stays the same. It cannot be determined from the information provided. 4. Which accurately describes widening the range of the confidence interval (by changing the confidence level)? The range is wider so there is more precision. The range is wider so there is less precision. The range is wider so the certainty is higher. The range is wider so the certainty is lower. 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? 1.16 1.41 2.33 3.73 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? 1.16 1.41 2.33 3.73