When data are collected in a statistical study for only a portion or subset of all elements of interest the researcher is using a:

SCENARIO 3-1Health 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 Medicaid. The ages of 25 senior citizens were as follows: 60  61 62 63 64 65 66 68 68 69 70 73 73 74 75 76 76 81 81 82 86 87 89 90 92 Referring to Scenario 3-1, identify which of the following is the correct statement.

SCENARIO 3-1Health 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 Medicaid. The ages of 25 senior citizens were as follows: 60 61 62 63 64 65 66 68 68 69 70 73 73 74 75 76 76 81 81 82 86 87 89 90 92 Referring to Scenario 3-1, calculate the standard deviation of the ages of the senior citizens correct to the nearest hundredth of a year (two decimal places).

At the U.S. Open Tennis Championship a statistician keeps track of every serve that a player hits during the tournament. The lower quartile of a particular player’s serve speeds was reported to be 88 mph. Which of the following interpretations of this information is correct?

Consider the following chart. Which of the following statements is most correct?

Solve the problem.At the U.S. Open Tennis Championship a statistician keeps track of every serve that a player hits during the tournament. The statistician reported that the mean serve speed of a particular player was 102 miles per hour (mph) and the standard deviation of the serve speeds was 14 mph. Using the z-score approach for detecting outliers, which of the following serve speeds would represent outliers in the distribution of the player’s serve speeds?Speeds: 53 mph, 116 mph, and 130 mph

SCENARIO 3-1Health 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 Medicaid. The ages of 25 senior citizens were as follows: 60 61 62 63 64 65 66 68 68 69 70 73 73 74  75 76 76 81 81 82 86 87 89 90 92 Referring to Scenario 3-1, calculate the coefficient of variation of the ages of the senior citizens. Use 2 decimal places 

Which of the following is the most appropriate description of S and σ ?                                 S                                    σ

SCENARIO 2-5The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier.RelativeTime (in Minutes)Frequency0 but less than 50.375 but less than 100.2210 but less than 150.1515 but less than 200.1020 but less than 250.0725 but less than 300.0730 or more0.02Referring to Scenario 2-5, what is the cumulative relative frequency for the percentage of calls that lasted under 20 minutes?

SCENARIO 3-1Health 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 Medicaid. The ages of 25 senior citizens were as follows: 60  61 62 63 64 65 66 68 68 69 70 73 73 74  75 76 76 81 81 82 86 87 89 90 92 Referring to Scenario 3-1 determine the first quartile of the ages of the senior citizens. Round to one decimal place