hat are the goals of random sampling? Can these goals be accomplished by randomizing participants instead? Why or why not?

A researcher is collecting individual data by asking visitors in a train station in a medium-sized town to fill in a questionnaire. It takes nearly 30 minutes to complete the survey questions. To encourage a higher participation rate, the researcher provides a small financial incentive that is enough to buy a sandwich. The researcher wants to use this sample to make predictions about the effect of using social media on health among the residents of the town. a. Explain the random sampling assumption, which is one of the Gauss-Markov assumptions for linear regressions.  b. Do you think this assumption is satisfied in the sample collected by the researcher? Explain your answer in no more than 85 words.

A statistics instructor wants to measure the effectiveness of his teaching skills in a class of 102 students (N = 102). He selects students by waiting at the door to the classroom prior to his lecture and pulling aside every third student to give him or her a questionnaire.       Is this sample design an example of random sampling? Explain.       Assuming that all students attend his class that day, how many students will the instructor select to complete his questionnaire?

What recommendations did the APA task force make about reporting What recommendations did the APA task force make about reporting statistical results (are significance tests alone sufficient?) What recommendations did the APA task force make about reporting

The students in an Introductory Statistics class are asked to complete a survey about study habits. (a) does the study appear to use random sampling? yes or no (b) does the study appear to use random assignment? yes or no

BESTION 12 the study description below to answer the following questions. A research group is interested in the relationship between alcohol consumption and heart disease in American men over the age of 40 years old. The researchers randomly selected 1913 medical records of men who suffer from heart disease. The researchers reco did not drink, drank moderately, or drank heavily. They found that men who had heart disease tended to drink heavily. Identify the population for the study. Identify the sample for the study. or the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). C Paragraph Arial 10pt T V 10 1 T == al || 15 15 №² Y

A store owner wants to know if he sells more sandals or sunglasses during the summer. He records the number of sales for both products for the entire month of June. What is the data-gathering technique used? A experiment randomized survey observational study D voluntary survey C

Data Management - Organization of Data for analysis

Performing a statistical analysis on managers and employees, and we need to determine whether the data is "significant" enough to consider the two groups to have different levels of desirability. How is the level of significance, p = 0.05, set?

Random digit dialing telephone surveys used to exclude cell phone numbers. If the opinions of people who have only cell phones differ from those of people who have landline service, the poll results may not represent the entire adult population. The Pew Research Center interviewed separate random samples of cell-only and landline telephone users who were less than 30 years old. Here’s what the Pew survey found about how these people describe their political party affiliation.     Do we reject, or fail to reject, the null hypothesis?