Chapter 2 and 3 Formula Reference Sheet Describe the shape of the distribution.

Chapter 2 and 3 Formula Reference Sheet Classify the variable as qualitative or quantitative. The bank account numbers of the students in a class.

Chapter 2 and 3 Formula Reference Sheet Provide an appropriate response. The following data are the yields, in bushels, of hay from a farmer’s last 10 years: 375, 210, 150, 147, 429, 189, 320, 580, 407, 180. Find the IQR.

Chapter 2 and 3 Formula Reference Sheet Provide an appropriate response. A researcher records the number of employees of each of the IT companies in the town of Westmoore. The results are summarized in the table.   Find the class width.

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 Provide an appropriate response. An Excel printout of some descriptive statistics for a set of data is shown below. What is the IQR?  

  Chapter 2 and 3 Formula Reference Sheet Provide an appropriate response. The Excel horizontal frequency bar graph below describes the employment status of a random sample of U.S. adults. Find the percentage of those reporting having “no job”.

Chapter 2 and 3 Formula Reference Sheet Provide an appropriate response. Use the following frequency distribution to determine the class limits of the third class.

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

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.