Question

A study discusses a prostate cancer screening program that began in a certain country in 1996 and was expanded geographically through 2005. The people in the study were given the option to receive screenings every two years. The goal of the study was to compare incidence-based rates of death from prostate cancer across four groups. Data were analyzed for 76,507 people. Rates of death were reduced in the screening group as compared to the historical screening group, and also in the nonscreening group as compared to the historical nonscreening group. Complete parts a through c below. Click the icon to view the four groups. a. Is this an observational or experimental study? A. The study is an experiment because none of the variables are controlled by the researchers. B. The study is an experiment because at least one of the variables is controlled by the researchers. C. The study is an observational study because none of the variables are controlled by the researchers. D. The study is an observational study because at least one of the variables is controlled by the researchers. b. Identify the response variable and the explanatory variable. The response variable is and the explanatory variable is c. Does the study prove that being offered screenings causes a reduction in death rates associated with prostate cancer? A. No, a lurking variable may exist that influences both variables. B. Yes, the study found an association between the two variables. C. No, it is unlikely that the two variables are connected. D. Yes, there is anecdotal evidence connecting the two variables. A new roller coaster at an amusement park requires individuals to be at least 4' 8" (56 inches) tall to ride. It is estimated that the heights of 10-year-old boys are normally distributed with ? = 53.0 inches and ? = 4 inches. What proportion of 10-year-old boys is tall enough to ride the coaster? The proportion of 10-year-old boys tall enough to ride the coaster is . (Round to four decimal places as needed.)

A study discusses a prostate cancer screening program that began in a certain country in 1996 and was expanded geographically through 2005. The people in the study were given the option to receive screenings every two years. The goal of the study was to compare incidence-based rates of death from prostate cancer across four groups. Data were analyzed for 76,507 people. Rates of death were reduced in the screening group as compared to the historical screening group, and also in the nonscreening group as compared to the historical nonscreening group. Complete parts a through c below.
Click the icon to view the four groups.

a. Is this an observational or experimental study?
A. The study is an experiment because none of the variables are controlled by the researchers.
B. The study is an experiment because at least one of the variables is controlled by the researchers.
C. The study is an observational study because none of the variables are controlled by the researchers.
D. The study is an observational study because at least one of the variables is controlled by the researchers.

b. Identify the response variable and the explanatory variable.
The response variable is and the explanatory variable is

c. Does the study prove that being offered screenings causes a reduction in death rates associated with prostate cancer?
A. No, a lurking variable may exist that influences both variables.
B. Yes, the study found an association between the two variables.
C. No, it is unlikely that the two variables are connected.
D. Yes, there is anecdotal evidence connecting the two variables.

A new roller coaster at an amusement park requires individuals to be at least 4' 8" (56 inches) tall to ride. It is estimated that the heights of 10-year-old boys are normally distributed with ? = 53.0 inches and ? = 4 inches.
What proportion of 10-year-old boys is tall enough to ride the coaster?

The proportion of 10-year-old boys tall enough to ride the coaster is .
(Round to four decimal places as needed.)

A study discusses a prostate cancer screening program that began in a certain country in 1996 and was expanded geographically through 2005. The people in the study were given the option to receive screenings every two years. The goal of the study was to compare incidence-based rates of death from prostate cancer across four groups. Data were analyzed for 76,507 people. Rates of death were reduced in the screening group as compared to the historical screening group, and also in the nonscreening group as compared to the historical nonscreening group. Complete parts a through c below.
Click the icon to view the four groups.

a. Is this an observational or experimental study?
A. The study is an experiment because none of the variables are controlled by the researchers.
B. The study is an experiment because at least one of the variables is controlled by the researchers.
C. The study is an observational study because none of the variables are controlled by the researchers.
D. The study is an observational study because at least one of the variables is controlled by the researchers.

b. Identify the response variable and the explanatory variable.
The response variable is and the explanatory variable is

c. Does the study prove that being offered screenings causes a reduction in death rates associated with prostate cancer?
A. No, a lurking variable may exist that influences both variables.
B. Yes, the study found an association between the two variables.
C. No, it is unlikely that the two variables are connected.
D. Yes, there is anecdotal evidence connecting the two variables.

A new roller coaster at an amusement park requires individuals to be at least 4' 8" (56 inches) tall to ride. It is estimated that the heights of 10-year-old boys are normally distributed with ? = 53.0 inches and ? = 4 inches.
What proportion of 10-year-old boys is tall enough to ride the coaster?

The proportion of 10-year-old boys tall enough to ride the coaster is .
(Round to four decimal places as needed.)

Added by Melody G.

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