A portion of a population is called a:

Which kind of sample allows each unit in a population to have an equal chance of being picked, and eliminates bias?

A data set is normally distributed with a mean of 40 and standard deviation of 10. According to the Empirical Rule, what percent of the data is between 20 and 50? (SHOW YOUR WORK AND/OR EXPLAIN WHAT YOU DID!)

What is the mode of the data set {3, 4, 4, 5, 5, 5, 7, 8, 9, 10, 10, 10, 11} ?

What is the tension T1T_1​ in the horizontal cable supporting the -N cat burglar, given that

Researchers at a public university in New England wanted to study the prevalence of food insecurity among students at their university. They posted flyers in several locations around campus asking students to participate in the study. The 237 students who responded to the flyers were asked to complete a survey concerning access to food and contributing factors. Of the students who completed the survey, 36 were food insecure. Which of the following best describes this sampling technique?

In order to analyze the availability of healthy food options in grocery stores in Denver, Colorado, researchers randomly selected 30 grocery stores from a list of all 108 grocery stores in the city. Each of the 30 selected stores was evaluated and assigned an availability score of low, moderate, or high. In this case, the sample is:

An independent school district has had an increasing number of student behavioral issues across the district in the last few years. In an effort to understand what behavioral issues are most commonly encountered and the strategies teachers are using to manage these issues, the district’s superintendent randomly selected five of the 30 schools in the district and interviewed each teacher at the five selected schools. What type of sampling was used?

• Please turn in your exam at the two-hour mark. There is extra time before the drop box closes. You won’t be penalized for missing the two-hour mark. Please contact dentsc@usc.edu, (213) 740-9356, if you’re having trouble.• Open book, open notes• Your favorite calculator is allowed• Good ethics are expected• The bonus problem is optional and may increase your grade. The maxscore is 100 pts. Midterm Exam

In 1850 Elizabeth Barrett Browning published a collection of poems that she initially claimed to have translated from what language?