1. Over the past 40 years, the percentage of homes in the United States with smokedetectors has risen steadily, and has plateaued at about 96% as of 2015. With thisincrease in the use of home smoke detectors, we would expect that death rates due tohome fires have decreased. The following table contains 17 years of data on the estimatedpercentage of homes with smoke detectors and the estimated home fire deaths per millionpeople:Year19992000200120022003200420052006200720082009201020112012201320142015Percentage ofHomes withSmokeDetectors0.480.650.720.740.750.80.790.830.840.860.880.90.950.960.970.960.96Home FireDeaths perMillion People2320.917.420.619.51917.716.313.714.514.413.1111110.38.58.2a. Do you expect a positive or negative relationship between smoke detector use anddeaths from home fires? Explain.b. Draw a scatterplot of these data. You can do it either by hand or using Excel.c. Compute the covariance and correlation coefficient. (Round your answer to fourdecimal places.). Is there a positive or negative correlation between smoke detector useand deaths from home fires? Comment and relate to your scatterplot.

Correlation Coefficient:A correlation coefficient is a number between -1 and 1 that tells you the…

Answered: 1. Over the past 40 years, the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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23. A population of 30 chemical processing units is to be sampled by a two-person crew. The mean time between calls for this operation is 68 minutes. If the mean service rate is one unit per minute, the cost of the crew and instruments will be $16 per minute. This cost will decrease to $12, $9, and $7 for service intervals of 2,3, and 4 minutes, respectively. The time between calls for service and the service duration are distributed exponentially. If lost profit is $28 per hour for each unit that is idle, find the minimum cost service interval.
A researcher thinks some social media sites are more prone to narcissistic behavior (excessive posting) than others. To examine the relationship between narcissism and social media, she recruits users of three different social media sites (Facebook, Twitter and Instagram), follows them for 24 hours and records the number of posts made by each user. The number of posts is given in the table below. Twitter Facebook Instagram 10 7 14 10 8. 10 10 10 11 9. www. 12 wwww. 11 13 12 8. 7 8. 11 8 10 12 11 11 a. Perform a complete hypothesis test to determine whether there are any significant differences among the three groups. Test at the .05 level of significance. SHOW ALL YOUR WORK b. Do you need to perform post hocs? Explain but do not compute the post hocs. C. Compute effect size. d. Summarize your findings in a source table. e. Write an interpretation of our results in APA-format (include means and SDs in your interpretation)
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.A new, miracle diabetes drug that diminishes major symptoms of diabetes has been approved by the FDA. Health care professionals and researchers believe that the new drug will prolong lifespan of diabetes patients. If the population is in steady state and the incidence is constant, what will the effect of this new drug be on the prevalence of diabetes in the population? Explain.
The survivorship curve indicated by the graph best represents a curve, and is common in populations of Life Stage O a. Type l, marine invertebrates O b. Type Il, fishes Oc. Type l, humans o d. Type II, birds O e. Type l, plants % Surviving
5. In the table below, compute age-specific mortality rates per 1,000 for Populations A & B in Table 1. (Hint: Decimal to at least the tenth.) 45 years Age-Specific Mortality Rate, per 1,000 Population A Age-Specific Mortality Rate, per 1,000 Population B
6. Accidents on highways are one of the main causes of death or injury in developing countries and the weather conditions have an impact on the rates of death and injury. In foggy, rainy, and sunny conditions, 1/4, 1/8, and 1/21 of the accidents result in death, respectively. Sunny conditions occur 60% of the time, while rainy and foggy conditions each occur 20% of the time. Given that an accident without deaths occurred, what is the conditional probability that it was foggy at the time?
Suppose the following table represents world oil production in millions of barrels a day for a recent period of time. Complete parts a and b. Region Oil Production (millions of barrels a day) Iran 6.97 Saudi Arabia 8.76 Other OPEC countries 21.77 Non-OPEC countries 53.53 Question content area bottom Part 1 a. Compute the percentage of values in each category. Region Oil Production (millions of barrels a day) Percentage Iran 6.97 enter your response here% Saudi Arabia 8.76 enter your response here% Other OPEC countries 21.77 enter your response here% Non-OPEC countries 53.53 enter your response here% (Round to two decimal places as needed.) Part 2 b. What conclusions can you reach concerning the production of oil in the specified time period? Oil production by non-OPEC countries accounted for ▼ less than a quarter more than half slightly less than half more than three dash quarters of total oil production. Oil production by OPEC countries other than Iran…
The number of adult Americans who smoke continues to drop. The table contains estimates of the percentages of adults (ages 1818 and over) who were smokers in the years between 1965 and 201715.and 201715. ???? ?Year � ??????? ?Smokers � 1965 41.94 1970 37.4 1974 37.1 1978 34.1 1980 33.2 1983 32.1 1985 30.1 1987 28.8 1990 25.5 1993 25.0 1995 24.7 1997 24.7 1999 23.5 2001 22.8 2002 22.5 2004 20.9 2006 20.8 2008 20.6 2010 19.3 2012 18.1 2014 16.8 2017 14.0 According to your regression line, how much did smoking decline per year during this period, on the average? Give your answer to three decimal places. average smoking decline: percentage points
• Part 1 Rework problem 3 in section 1 of Chapter 7 of your textbook, about the Natural Fertilizer Company, using the following data. Assume that the company produces 100 pound sacks of 30-25-20 fertilizer for lawns and 100 pound sacks of 15-15-12 fertilizer for gardens, where the numbers are the percentage by weight of nitrate, phosphate, and potash, respectively, in each sack. Assume also that the company has on hand 12 tons of nitrate, 9 tons of phosphate, and 6 tons of potash, Assume also that the profit on each sack of lawn fertilizer is $10.00 and the profit on each sack of garden fertilizer is $6.00. How many sacks of each type of fertilizer should the company make in order maximize its profit? When you formulate a linear programming problem to solve this problem, how many variables, how many constraints (both implicit and explicit), and how many objective functions should you have? Number of variables: 2 Number of constraints: 5 Number of objective functions: 1 » Part 2 • Part…
Section 6.3: Distribution of Differences in Proportions Example 1: Proportion of Foreign-Born Residents, Alabama and Arizona From the 2010 US Census, we learn that 13.9% of the residents of Arizona were born outside the US while 3.4% of the residents of Alabama were born outside the US. If we take random samples of 200 residents from each state and calculate the difference in the proportion of foreign-born residents (Arizona – Alabama), describe the shape, mean, and standard error of the distribution of differences in proportions.

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