The numbers of polio cases in the world are shown in the table for various years.Year Number of Polio Cases (thousands)1988199219962000200520073501383653.21.3Let f(t) be the number of polio cases (in thousands) t years after 1980.Copy the data to Desmos to draw a scatterplot of the data. Make sure to adjust the years so they representyears after 1980.a) Is it better to model the data with a linear or with an exponential model? [Select an answerb) Use regression in Desmos to find an appropriate model for f. Make sure to check Log mode in theparameter window in Desmos if you are fitting an exponential model.f(t)Round the coefficients to 4 decimal places.Hint: Use the variable t from the drop down menu when entering the equation. Do not just type in t.c) Predict the number of polio cases in 2014.d) Find the approximate half-life of the number of polio cases. Round the answer to one decimal place.years

Let, ft be the number of polio cases (in thousand) t years afters 1980. The data can be written as:…

Answered: The numbers of polio cases in the world…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Ozone levels (in parts per billion, ppb) were recorded at sites in New Jersey monthly between 1926 and 1971. Here are boxplots of the data for each month The month of Ozone (ppb) 440- 400- The month of 360- 320- 280- 240 1 L TH OHH OHH a) In what month was the highest ozone level ever recorded? The highest ozone level ever was recorded in b) Which month has the largest IQR? c) Which month has the smallest range? • HIH • has the largest IQR. HOH O HH 2 3 4 5 6 7 8 9 Month has the smallest range. d) Write a brief comparison of the ozone levels in January and June. Choose the correct answer below. OA. The median ozone level in June was slightly lower than the median ozone level in January and the IQR was significantly smaller. OB. The median ozone level in June was slightly higher than the median ozone level in January, but the IQR was significantly smaller. OHH OC. The median ozone level in June was slightly lower than the median ozone level in January, but the IQR was significantly…
The following data report total, monthly U.S. gasoline sales in millions of dollars from January 2017 toDecember 2018. (To find the data, go to the site https://www.census.gov/retail/index.html#mrts, find“Monthly Retail Trade Report,” then select “Time Series/Trend Charts.”)Year Month Sales ($ millions)2017 Jan $35,6302017 Feb 33,9722017 Mar 38,6222017 Apr 38,9732017 May 40,7392017 Jun 40,0092017 Jul 39,7972017 Aug 41,2172017 Sep 41,3462017 Oct 41,7172017 Nov 40,1862017 Dec 40,0462018 Jan 39,2232018 Feb 37,3772018 Mar 42,6482018 Apr 43,1092018 May 48,0492018 Jun 47,5462018 Jul…
High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours. Cockpit noise in a jet aircraft is mostly due to airflow at hundreds of miles per hour. This 3 x 3 contingency table shows 61 observations of data collected by an airline pilot using a handheld sound meter in a certain aircraft cockpit. Noise level is defined as "low" (under 88 decibels), "medium" (88 to 91 decibels), or "high" (92 decibels or more). There are three flight phases (climb, cruise, descent). Noise Level Low (L) Medium (M) High (H) Column Total Cockpit Noise i P(B) ii P(L) iii P(H|C) iv P(HID) v P(L and B) vi P(L and C) Climb (B) 7 17 6 30 Flight Phase Cruise Descent (C) (D) 6 7 3 3 2 11 10 20 Click here for the Excel Data File (a) Calculate the following probabilities: (Round your answers to 4 decimal places.) 0.4918 Row Total 20 23 18 61
Speed cameras (SC) are used to reduce the risk of accidents in accident-prone zones in metropolitan cities. To study the effectiveness of speed cameras, transport engineers would like to compare the average number of accidents in junction A (with SC) and junction B (without SC). The number of accidents in 105 weeks in two junctions are provided below. 6 7+ Number of Accidents 0 1 2 3 4 5 Observed frequency 40 20 15 16 10 3 1 0 Number of Accidents 0 1 2 3 4 5 6 7+ Junction B without SC Observed frequency 25 24 18 15 18 41 0 Junction A with SC Test the average number of accidents per week in junctions A and B are same at the 5% significance level.
Example 3 Draw bar diagram for the following data. Years 1996 1997 1998 1999 2000 2001 Scale (*000) 75 90 85 98 105 109
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