During the past decade, the percentage of smokers in a certain country has decreased 27.227.2% to 13.213.2%. What percentage of the population of that country smoked at the beginning of the decade?
Added by Sara V.
Step 1
Let's think step by step. Show more…
Show all steps
Close
Your feedback will help us improve your experience
Neel Faucher and 67 other Algebra educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
On November $3-5,2005,$ the Gallup Organization surveyed 1028 adults and found that 226 of them had smoked at least one cigarette in the past week. In $1990,$ Gallup also asked 1028 adults the same question and determined that 278 adults had smoked at least one cigarette in the past week. Can we say the proportion of American adults who smoked at least one cigarette in the past week has decreased since $1990 ?$ Why?
Inferences on Two Samples
Inference about Two Population Proportions
The bar graph shows the percentage of adults in country X who smoked cigarettes for selected years from 1965 through 2009. Does the mathematical model underestimate or overestimate the percentage of adults in country X who smoked cigarettes in 2009? By how much? Use the mathematical model to project the percentage of adults in country X who will smoke cigarettes in 2015. Percentage of Adults In Country X Who Smoke Cigarettes. Does the mathematical model underestimate or overestimate the percentage of adults in country X who smoked cigarettes in 2009? By how much? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. (Simplify your answer. Type an integer or a decimal.) A. underestimates by % B. overestimates by % b. The percentage of adults in country X who will smoke cigarettes in 2015 is %. (Simplify your answer. Type an integer or a decimal.) The mathematical model C = -0.5x + 35 approximates the data displayed in the bar graph, where C is the percentage of adults in country X who smoke and x is the number of years after 1965. Use this formula to answer parts a and b.
Daniel C.
Joanna Q.
Recommended Textbooks
Elementary and Intermediate Algebra
Algebra and Trigonometry
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD