Concept explainers
Use the four-step procedure for solving variation problems given on page 445 to solve Exercises 21–36.
31. Body-mass index, or BMI, takes both weight and height into account when assessing whether an individual is underweight or overweight. BMI varies directly as one’s weight, in pounds, and inversely as the square of one’s height, in inches. In adults, normal values for the BMI are between 20 and 25, inclusive. Values below 20 indicate that an individual is underweight and values above 30 indicate that an individual is obese. A person who weighs 180 pounds and is 5 feet, or 60 inches, tall has a BMI of 35.15. What is the BMI, to the nearest tenth, for a 170-pound person who is 5 feet 10 inches tall? Is this person overweight?
Trending nowThis is a popular solution!
Chapter 3 Solutions
EBK COLLEGE ALGEBRA ESSENTIALS
- 10 20 30 40 50 60 70 80 Wind speed (km/h The inter quartile range for the wind speeds isarrow_forwardUse the table to express the 2006 fatality rate in deaths per 100 million vehicle-miles traveled. Year Population (millions) Traffic fatalities Licensed drivers(millions) Vehicle miles(trillions) 1984 247 47,711 162 1.8 1991 288 42,093 183 2.6 2006 298 47,481 195 3.3 The 2006 fatality rate is____deaths per 100 million vehicle-miles.arrow_forwardQ1. The table provided gives data on indexes of output per hour (X) and real compensation per hour (Y) for the business and nonfarm business sectors of the U.S. economy for 1960–2005. The base year of the indexes is 1992 = 100 and the indexes are seasonally adjusted. a. Plot Y against X for the two sectors separately. b. What is the economic theory behind the relationship between the two variables? Does the scattergram support the theory? c. Estimate the OLS regression of Y on X. Note: on the table ( 1. Output refers to real gross domestic product in the sector. 2. Wages and salaries of employees plus employers’ contributions for social insurance and private benefit plans. 3. Hourly compensation divided by the consumer price index for all urban consumers for recent quarters.) Thank you!arrow_forward
- Body mass index (BMI) is a measure of body composition, which can be used to assess if someone is underweight, healthy weight, overweight but not obese, or obese. It is calculated as a person’s weight (measured in Kilograms) divided by his/her height (measured in meters) squared. We recorded 5 students’ BMI values and the numbers of hours they exercised in the past week, as following: BMI 18.4 19.6 20.5 27.6 30.6 Hours of exercise 3.0 2.5 4.0 2.7 0.5 What is the value of r?arrow_forwardsummarraize the concentration of the drug in the bloodstream for the first 20 hours afetr it is taken. use the findings from a-e to validate your statementsarrow_forwardanalyze This figure plots the changes in Vietnam’s TB during the period January 2010 – December 2019arrow_forward
- Average adult Americans are about one inch taller, but nearly a whopping 25 pounds heavier than they were in 1960, according to a new report from the Centers for Disease Control and Prevention (CDC). The bad news, says CDC is that average BMI (body mass index, a weight-for-height formula used to measure obesity) has increased among adults...” Boston is considered one of America’s healthiest cities – is the weight gain since 1960 similar in Boston? A sample of n=28 adults suggested a mean increase of 19.5 pounds over the mean recorded in 1960 with a standard deviation of 8.6 pounds. Is Boston statistically significantly different in terms of weight gain from the national mean since 1960? Run the appropriate test at a 5% level of significance. Please use the five steps to demonstrate proper hypothesis testing and explain your results. Please do not use any software calculations.arrow_forwardStatistics Questionarrow_forwardDO THE CHI SQUARED TESTarrow_forward
- c. Predict Sales if a city has 2.0 million women over the age of 60 and their average income is $43,000. (Enter your answer in millions rounded to 2 decimal places.) X Answer is complete but not entirely correct. Predicted Sales 356.00 Xarrow_forwardsevere storms indicate that e3.5 feet. Does this information suggest that the storm is (perhaps temporarily) increasing above the severe rating? Use off fxed cement piers. Suppose that a reading of 31 waves showed an average wave height of x= 16.7 feet. Previous studies of Weatherwise is a magazine published by the American Meteorological Society. One issue gives a rating system used to classify Nor'easter storms that frequently hit New England and can cause much damage near the ocean. A severe storm has an average peak wave height of 164 feet for waves hitting the shore. Suppose that a Nor'easter is in progress at the severe storm class rating. Peak wave heights are usually measured from land C (a) What is the level of significance? State the null and alternate hypotheses. Ho: H- 16.4 ft; H:>'16.4 ft Ho: H 16.4 ft; H1: = 16.4 ft Ho: H- 16.4 ft; H: H+ 16.4 ft (b) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. The standard…arrow_forwardFind the mean hourly cost when the cell phone described above is used for 240 minutes.arrow_forward
- College Algebra (MindTap Course List)AlgebraISBN:9781305652231Author:R. David Gustafson, Jeff HughesPublisher:Cengage Learning