Math 225N - Statistical reasoning for health sciences Week 2 Quiz with answers(Latest update)2021

Question 1 · 0/1 points A company has developed a wristband for monitoring blood sugar levels without requiring direct blood samples. It is interested in demonstrating the accuracy of the device for governmental approval and has decided to test the claim "The glucose level reported by the wristband is within 10% of a standard blood test result." Which of the following data collection processes would be appropriate? Select only one answer choice. That's not right. Choose a random sample of employees at lunchtime and measure their blood sugar using both the wristband and a standard blood test. Choose a random sample of people from the local area and random times throughout the day and measure their blood sugar using both the wristband and a standard blood test. Choose a random sample of people from the local area and random times and measure their blood sugar using the wristband. Choose another random sample of people and random times and measure their blood sugar using the standard blood test. Go to a hospital and have the doctors choose a random sample of patients to be tested at random times using both the wristband and the standard blood test. Answer Explanation Correct answer: Choose a random sample of people from the local area and random times throughout the day and measure their blood sugar using both the wristband and a standard blood test. To compare the wristband to the standard blood test, both methods should be used to measure the blood sugar of the same person at the same time. The people chosen should be random, and the time of measurement should be random to help eliminate the effects of any confounding variables. Your answer: Choose a random sample of people from the local area and random times and measure their blood sugar using the wristband. Choose another random sample of people and random times and measure their blood sugar using the standard blood test. This choice will not allow us to test the accuracy of the wristband since we will not draw the blood from wristband wearing subjects. Something's not right... There is an error in the instruction or question. This looks broken... A graph/image/equation/video isn't working I cannot enter my answer. A problem is preventing me from entering an answer to this question. I have an idea! I have some feedback/suggestions. Feedback Something's not right... There is an error in the instruction or question. This looks broken... A graph/image/equation/video isn't working I cannot enter my answer. A problem is preventing me from entering an answer to this question. I have an idea! I have some feedback/suggestions. Content attribution- Opens a dialog Question 2 · 1/1 points A farmer divided his piece of land into 4 equivalent groups. The quality of the soil is the same across the 4 groups of land. He planted the same crop in all 4 groups of land and recorded the yield of the crop in all 4 groups for a 4 week period. Is the study observational or experimental? If it is an experiment, what is the controlled factor? That is correct! The study is an observational study. The study is an experiment. The controlled factor is the 4 week observation period. The study is an experiment. The controlled factor is the land. The study is an experiment. The controlled factor is the growth of the crops. Answer Explanation Correct answer: The study is an observational study. The samples are chosen using an appropriate process; however, no attempt is made to control any aspect of the sample even though the variables of interest are recorded for each group. Something's not right... There is an error in the instruction or question. This looks broken... A graph/image/equation/video isn't working I cannot enter my answer. A problem is preventing me from entering an answer to this question. I have an idea! I have some feedback/suggestions. Feedback Something's not right... There is an error in the instruction or question. This looks broken... A graph/image/equation/video isn't working I cannot enter my answer. A problem is preventing me from entering an answer to this question. I have an idea! I have some feedback/suggestions. Content attribution- Opens a dialog Question 3 · 1/1 points To test the effectiveness of a drug proposed to relieve symptoms of headache, physicians included participants for a study. They gave the drug to one group and a drug with no therapeutic effect to another group. Which group receives the placebo? That is correct! the physicians the group that received the drug for headache the group that received the drug with no therapeutic effect all of the people in the study Answer Explanation Correct answer: the group that received the drug with no therapeutic effect When the experimental units are people, applying treatments that should be inert can actually have effects. In this study, the drug with no therapeutic effects is the placebo, so the group that receives that drug receives the placebo. Something's not right... There is an error in the instruction or question. This looks broken... A graph/image/equation/video isn't working I cannot enter my answer. A problem is preventing me from entering an answer to this question. I have an idea! I have some feedback/suggestions. Feedback Something's not right... There is an error in the instruction or question. This looks broken... A graph/image/equation/video isn't working I cannot enter my answer. A problem is preventing me from entering an answer to this question. I have an idea! I have some feedback/suggestions. Content attribution- Opens a dialog Question 4 · 1/1 points Matthew has created a survey to test whether or not gender has any effect on political party associations. What is the explanatory variable in this situation? That is correct! the number of people surveyed political party associations gender none of the above Answer Explanation Correct answer: gender The explanatory variable is the independent variable, which is the variable that is changed to determine its effect on a dependent variable. In this case the explanatory variable is gender. Something's not right... There is an error in the instruction or question. This looks broken... A graph/image/equation/video isn't working I cannot enter my answer. A problem is preventing me from entering an answer to this question. I have an idea! I have some feedback/suggestions. Feedback Something's not right... There is an error in the instruction or question. This looks broken... A graph/image/equation/video isn't working I cannot enter my answer. A problem is preventing me from entering an answer to this question. I have an idea! I have some feedback/suggestions. Content attribution- Opens a dialog Question 5 · 1/1 points Is the statement below true or false? Continuous data are the type of quantitative data that is the result of measuring. That is correct! True False Answer Explanation Correct answer: True Continuous data are defined as the type of quantitative data that is the result of measuring. Something's not right... There is an error in the instruction or question. This looks broken... A graph/image/equation/video isn't working I cannot enter my answer. A problem is preventing me from entering an answer to this question. I have an idea! I have some feedback/suggestions. Feedback Something's not right