statistic paper 495426

1. Classify the following studies as descriptive or inferential and explain your reasons: (1 pts.) A study on stress concluded that more than half of all Americans older than 18 have at least “moderate” stress in their lives. The study was based on responses of 34,000 households to the 1985 National Health Interview Survey. (1 pts.) A report in a farming magazine indicates that more than 95% of the 400 largest farms in the nation are still considered family operations. 2. Thirty-five fourth-grade students were asked the traditional question “what do you want to be when you grow up? The responses are summarized in the following table: Employment Frequency Relative Frequency Teacher 8 0.229 Doctor 6 0.171 Scientist 3 0.086 Police Officer 9 0.257 Athlete 9 0.257 (2 pts.) Construct a pie chart for relative frequency (2 pts.) Construct a bar graph for the relative frequencies 3. In a college freshman English course, the following 20 grades were recorded 48 88 47 39 45 44 98 76 84 54 67 91 84 38 75 38 35 82 42 82 Find the: (1 pt.)Quartiles for the above data set (1 pt.)Range for the above data set (1 pt.)Mean for the above data set (1 pt.)Variance for the above data set 4. The age distribution of students at a community college is given below: Age in Years Number of Students (f) Under 21 4946 21 – 25 4808 26 – 30 2673 30 – 35 29036 Over 35 525 Suppose a student is selected at random. Let A = the event the student is under 21 B = the event the student’s age is between 21 and 25 C = the event the student’s age is between 26 and 30 D = the event the student’s age is between 31 and 35 E = the event the student’s age is under 35 (2 pts.) Find P (B) (2 pts.) Find P (E) 5. A study of the effect of college education on job satisfaction was conducted. A contingency table is presented below: Attended College Did not Attend Total Satisfied with…