LS23L Final Exam Study Guide: Key Concepts & Hypotheses

My sites / 21F-LIFESCI23L-1 / LAB FINAL / LS23L Final Exam STAGE I - F21 Winter 2022 - Week 2 Fall 2021 - LIFESCI23L-1 - PFLUEGL Started on Monday, 6 December 2021, 1:17 PM PST State Finished Completed on Monday, 6 December 2021, 2:02 PM PST Time taken 44 mins 56 secs Feedback Thank you for completing Stage I of the LS23L final exam. Your answers will be available for review starting on Tuesday at 5pm. Question 1 Complete Points out of 1.00 Question 2 Not answered Not graded A p-value of 0.36 obtained from a two-tailed t-test means that there is a ____ % probability that the difference between the sample groups is due to chance. Given the conventional significance level, you would _______ the null hypothesis. a. 36, fail to reject b. 36, reject c. 3.6, fail to reject d. 3.6, reject e. 0.36, fail to reject f. 0.36, reject This is a space for you to take notes on the previous question. These notes are not graded and are just to help you when you review your exam with your group later. Be mindful of your time limit on the exam and just write enough to jog your memory later. Answer:

Question 3 Complete Points out of 1.00 Question 4 Not answered Not graded Information Read the following hypothesis and then answer the question below: "The hypothesis is that people who drank a big cup of coffee before taking the MIT will have a different response time than people who drank a small cup of coffee before taking the MIT. The null hypothesis is that people who drank a big cup of coffee before taking the MIT will not have a different response time than people who drank a small cup of coffee before taking the MIT." This hypothesis is: ______________ a. Specific but not testable using the MIT b. Not specific and not testable using the MIT c. Not specific but testable using the MIT d. Specific and testable using the MIT This is a space for you to take notes on the previous question. These notes are not graded and are just to help you when you review your exam with your group later. Be mindful of your time limit on the exam and just write enough to jog your memory later. Answer: Read over the following description of an experiment and then answer the questions below: Scientists compare response time on the MIT between two groups - 258 people who got 5 hours of sleep before taking the MIT and 325 people who got 8 hours of sleep before taking the MIT. They run a two tailed unpaired t-test on the data and use the conventional significance threshold. The resulting t-value is 1.872 and the p-value is 0.019.

Question 5 Complete Points out of 1.00 Question 6 Not answered Not graded Question 7 Complete Points out of 1.00 Which of the following hypotheses are best given what you know of the experimental design? a. The hypothesis is that people who took the MIT twice, once after getting 5 hours of sleep and once after getting 8 hours of sleep, will have different response times on the MIT. The null hypothesis is that people who take the MIT after 5 hours of sleep and again after 8 hours of sleep will have the same response time. b. The hypothesis is that people who get less sleep before taking the MIT will have a different response time than people who got more sleep before taking the MIT. The null hypothesis is that there will be no difference in response time between people who got more sleep and people who got less sleep before taking the MIT. c. The hypothesis is that people who got 5 hours of sleep will have a slower response time on the MIT than people who got 8 hours of sleep before taking the MIT. The null hypothesis is that there will be no difference in response time between people who got 5 hours of sleep before taking the MIT and people who got 8 hours of sleep before taking the MIT. d. The hypothesis is that people who got 5 hours of sleep before taking the MIT will have a different response time than people who got 8 hours of sleep before taking the MIT. The null hypothesis is that people who got 5 hours of sleep before taking the MIT will not have a different response time than people who got 8 hours of sleep before taking the MIT. This is a space for you to take notes on the previous question. These notes are not graded and are just to help you when you review your exam with your group later. Be mindful of your time limit on the exam and just write enough to jog your memory later. Answer: Which of the following statements is correct regarding the experiment described above? a. We would fail to reject the null hypothesis b. We cannot determine significance from the data provided c. There is a 0.019% probability these differences are due to chance d. These groups are significantly different

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