Energy Cost Family ID1 Family energy cost data2111.An economist wants to determine whether the monthly energy cost for families has changed from theprevious year, when the mean cost per month was $200. The economist randomly samples 25 families57255832504and records their energy costs for the current year. Has the energy cost changed significantly since last5year?478307184743584603081018811111126761332614142152551620517771819019320204072133322488233742440925

Answered: Image /qna-images/answer/c04c5634-87a7-44fd-b08f-4bee13162821.jpg

Answered: Energy Cost Family ID 1 Family energy…

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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10 20 30 40 50 60 70 80 Wind speed (km/h The inter quartile range for the wind speeds is
E Example 3.2: The data below represents the length (in seconds) of a random sample of songs released in the 90's. 198 255 287 207 176 224 215 208 241 Find the mean, median and mode of this data set.
Find the values at the 35th and 70th percentiles for the data set. 15 14 17 8 10 1 6 1 20 18 18 5 14 5 12 18 1 17 5 7
Using the data from the table Disease or illness less than $35,000 $35,000 - 49,999 $50,000 - 74,999 $75,000 - 99,999 $100,000 or more Coronary heart disease 8.1 6.5 6.3 5.3 4.9 Stroke 3.9 2.5 2.3 1.8 1.6 Emphysema 3.2 2.5 1.4 1.0 0.8 Chronic bronchitis 6.3 4.0 4.4 2.2 2.4 Diabetes 11.0 10.4 8.3 5.6 5.9 Ulcers 8.7 6.7 6.5 4.7 4.4 Kidney disease 3.0 1.9 1.3 0.9 0.9 Liver disease 2.0 1.6 1.0 0.6 0.7 Chronic arthritis 33.4 30.3 27.9 27.4 24.4 Hearing trouble 17.2 16.0 16.0 16.2 12.4 Vision trouble 12.7 9.8 7.5 5.7 6.6 No teeth 11.6 7.8 5.5 4.2 4.1 A) create a line graph plotting Annual family income on the x-axis and prevalence of disease or illness on the y-axis. Include all data points for each disease on the same chart ( i.e.? plot the prevalence for each disease or illness as it's own line on a single chart) B) do any of the chronic disease in the table appear to have a dose-response relationship to annual family income? Justify your…
In a large city, commuter trains are used to transport people into the downtown area. Trains arrive many times a day to a downtown station. While most are on time, some are late. The table shows on-time data from the past week. Train Status On Time Late Total Day of the Week Monday 32 8 40 Tuesday 24 16 40 Wednesday 37 3 40 Thursday 29 11 40 Friday 30 20 50 Total 152 58 210 What percentage of trains were late in this particular week? 27.6% 38.2% 40.0% 72.4%
Find the values at the 35th and 70th percentiles for the data set. 15 14 17 8 10 1 6 1 20 18 18 5 14 5 12 18 1 17 5 7
Part 3. 1. By relying on the data table below, determine the weighted average of all data. Rounded to the nearest unit.
A study was done to look at the relationship between number of movies people watch at the theater each year and the number of books that they read each year. The results of the survey are shown below. Movies 10 7 6 10 0 9 1 6 Books 0 0 -0 0 9 0 9 -0 Use the model to predict the number of books read per year for someone who watches 3 movies per year.Books per year = (Please round your answer to the nearest whole number.) Interpret the slope of the regression line in the context of the question: The slope has no practical meaning since people cannot read a negative number of books. As x goes up, y goes down. For every additional movie that people watch each year, there tends to be an average decrease of 0.98 books read. Interpret the y-intercept in the context of the question: The y-intercept has no practical meaning for this study. If someone watches 0 movies per year, then that person will read 8 books this year. The best prediction for a person who doesn't watch…
A statistical program is recommended. The owner of a movie theater company would like to predict weekly gross revenue as a function of advertising expenditures. Historical data for a sample of eight weeks follow. Weekly Gross Revenue ($1,000s) 96 = 91 95 92 95 94 94 94 Television Newspaper Advertising Advertising ($1,000s) ($1,000s) 5 2 4 2.5 3 3.5 2.5 3 1.5 2 1.5 2.5 3.2 2.3 4.1 2.5 (a) Use α = 0.01 to test the hypotheses Ho: B₁ = B₂ = 0 Ha: B₁ and/or B₂ is not equal to zero for the model y = Bo + B₁X₁ + B₂x₂ + ε, where X1 = television advertising ($1,000s) x2 newspaper advertising ($1,000s). Find the value of the test statistic. (Round your answer to two decimal places.)
26 14 30 45 20 21 27 32 40 Age of residents in a neighbourhood 50 9 37 40 36 13 52 10 35 What is the percentile of the data point 40 in the data set? 12 36 57 28 51 47 48 42 42 52 1 53
Part A Market researchers want to estimate the mean monthly expenditure on transport for households in Sydney. They randomly selected 19 householders and asked their expenditure on transport, in dollars, over the past month. Data from the selected households are given below. 181 266 339 292 420 150 484 488 282 571 536 153 583 434 135 187 497 144 520 What is the best point estimate of the population mean, to two decimal places? Give your answer in the form xxx.xx Data can be copied and pasted into Excel to complete the calculations. Part B Now assume that the population standard deviation is known to be 170. To two decimal places, what is the standard error for the mean of the sample? Give your answer in the form xx.xx Part C Based on the given sample and the known standard deviation, calculate a 90% confidence interval for mean monthly expenditure on transport. What are the lower and upper limits of the confidence interval? Give your answers to one decimal place, in the form xxx.x…
16 In 1970, the U.S. Armed Services instituted a lottery as a random selection process when 19- year old males were drafted into service. Each of the possible 366 possible birth dates was placed in a separate capsule and each capsule was placed in a large plastic drum. Those with the lowest lottery numbers were drafted before others. For example, the May 9th was 176. This meant that there would be 175 groups of males born on other days drafted before those who had been born on May 9th. The scatter plot below shows the median draft eligible number for each month of the year. The line that connects the points is sometimes called a median trace line. Which one of the following statement is TRUE? * Median Trace of Draft Lottery Numbers 240 220- 200- 180- 160 140 120 100 F M. A Median Draft Number to

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