Chapter 2 and 3 Formula Reference Sheet Find the sample standard deviation. 37, 44, 84, 84, 41, 68, 38, 78, 53

Chapter 2 and 3 Formula Reference Sheet Determine whether the study depicts an observational study or an experiment. The personnel director at a large company would like to determine whether the company cafeteria is widely used by employees. She calls each employee and asks them whether they usually bring their own lunch, eat at the company cafeteria, or go out for lunch.

Chapter 2 and 3 Formula Reference Sheet Construct a frequency distribution for the data using five classes. Describe the shape of the distribution.  

Chapter 2 and 3 Formula Reference Sheet Provide an appropriate response. The policy committee at State University has 6 members: LaToyna, Ming, Jose, John, Prof. Rise, and Dr. Hernandez. A subcommittee of two members must be formed to investigate the visitation policy in the dormitories. List all possible simple random samples of size 2.

Chapter 2 and 3 Formula Reference Sheet Provide an appropriate response. A severe drought affected several western states for 3 years. A Christmas tree farmer is worried about the drought’s effect on the size of his trees. To decide whether the growth of the trees has been retarded, the farmer decides to take a sample of the heights of 25 trees and obtains the following results (recorded in inches):

Chapter 2 and 3 Formula Reference Sheet Use the histograms shown to answer the question. Is either histogram symmetric?

Chapter 2 and 3 Formula Reference Sheet Provide an appropriate response. Health care issues are receiving much attention in both academic and political arenas. A sociologist recently conducted a survey of citizens over 60 years of age whose net worth is too high to qualify for government health care but who have no private health insurance. The ages of 25 uninsured senior citizens were as follows: Suppose the mean and standard deviation are 74.0 and 9.7, respectively. If we assume that the distribution of ages is bell shaped, what percentage of the respondents will be between 64.3 and 93.4 years old?

Chapter 2 and 3 Formula Reference Sheet Determine whether the study depicts an observational study or an experiment. A scientist was studying the effects of a new fertilizer on crop yield. She randomly assigned half of the plots on a farm to group one and the remaining plots to group two. On the plots in group one, the new fertilizer was used for a year. On the plots in group two, the old fertilizer was used. At the end of the year the average crop yield for the plots in group one was compared with the average crop yield for the plots in group two.

Chapter 2 and 3 Formula Reference Sheet Provide an appropriate response. Which type of bias occurs because the individuals tend to favor one part of the population over another?  

Chapter 2 and 3 Formula Reference Sheet Classify the variable as qualitative or quantitative. The number of seats in a school auditorium.