Test 2 1 A college dietician wants to survey the students in

Test 2

1. A college dietician wants to survey the students in her college to learn what they think about the cafeteria food on campus. She goes near the food court on a weekday during the lunch time and randomly stops students to ask the survey questions. What kind of sampling is used here?
a) Stratified sample c) Simple random sample
b) Cluster sample d) Convenience sample

2. Franklin University wants to survey its students regarding their plans after graduation. 40 undergraduate students and 25 graduate students are selected randomly to take the survey. What kind of sampling is used here?
a) Stratified sample c) Simple random sample
b) Cluster sample d) Convenience sample

3. You want to make a graph to display the frequency distribution of the salaries of the 900 professors at a very large university. Which of the following would be the best type of graph for this?
a) Time series graph b) Pie chart c) Boxplot d) Histogram

4. Modern Technology University studied records of 500 traffic crushes in the past year involving drivers with cell phones. It was found that cell phone use quadruples the risk of a traffic crush. Which of the following identifies the type of the study described here?
a) Observational study c) Randomized experiment
b) Double blind experiment d) Case-controlled study

5. Which of the following statements describes a population parameter?
a) In a sample of 95 registered voters, 47 said that they approve the current foreign affairs policies.
b) The average age of all flight attendants who work in Wing Airlines is 24 years.
c) In a recent survey of American adults, 65% of women respondents said their gender faced at least some discrimination in society.
d) Amy lost a total of 6 pounds last month.

Solution

1. d) Convenience sample because college dietician went near the food court on a weekday at her convenience during the lunch time and randomly stops students to ask the survey questions.

2. a) Stratified sample because students are first divided in strata (undergraduate and graduate) and then 40 students from undergraduate stratum and 25 students from graduate stratum are selected.

3. d) Histogram because for large quantitative data, we should create histogram.

4. a) Observational study because researcher merely observes accidents. No random assignment of treatment is involved in this study.

5. b) The average age of all flight attendants who work in Wing Airlines is 24 years because only this option is about \"all\" or \"population\" not for sample.