A study found that the ratio between the number of people who drive cars and the number of people who ride bicycles is1:3. Additionally, of those who drive cars, one out of five drive electric cars, Out of all people who drive cars and ridebicycles, which of the following represents the percentage of people who use non-electric gasoline cars?Select the single best answer:A. 10%B. 13%C. 20%D. 25%E. This cannot be determined.

Answered: Image /qna-images/answer/d13054f5-91e6-48bf-b7ad-e9c95ecefb75.jpg

Answered: A study found that the ratio between…

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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O Observer O Learner O Practitioner O Expert Objective(s): 3.3 I can explore proportions through real-world situations A. WARM UP 1. What is 59% of 100? 2. What is 59% of 92? 3. What is 59% of 176? 4. Explain why question 1 is particularly 'easy' to do, compared to questions 2 and 3.
Cory is serving coffee in a large reception with many guests. There are two kinds of coffee: regular anddecaf. So far, he has served 71 cups of regular and 49 cups of decaf.Question 3.Based on the information so far:(a) Estimate the proportion of coffee-drinking guests who prefer regular.
A consumer group wanted to determine if there was a difference in customer perceptions about prices for a specific type of toy depending on where the toy was purchased. In the local area there are three main retailers: W-Mart, Tag, and URToy. For each retailer, the consumer group randomly selected 5 customers, and asked them to rate how expensive they thought the toy was on a 1-to-10 scale (1= not expensive, to 10 = very expensive). The toy was priced the same at all retail stores. 1. What kind of statistical test should be used to test the consumer group's research goal, assuming that the researcher wanted to use the 1-to-10 scale as a numerical interval measure? A. Repeated-measures t-test B. One-way Independent Measures ANOVA C. Repeated-measures ANOVA D. Independent-measures t-test 2. State the hypothesis that aims to test the consumer group’s research goal (i.e., what is H0 and HA).
A biologist gathered the following information about deer populations in a national park area. Juvenile (age ≤ 2 years) Adult (age > 2 years) Total Male 23 171 194 Female 112 935 1044 Total 135 1103 1238 The biologist made the calculation shown below. Which question was she trying to answer? 23 ÷ 194 a. What percentage of the male deer are juveniles? b. What percentage of the juvenile deer are males? c. What percentage of the total deer are juvenile males? d. What percentage of the total deer are males?
Answer all following questions or don't do it at all 10a. By employing a common base of 100, percentages facilitate the comparison of groups of unequal size. TRUE or FALSE? 11b. What percentage corresponds to 2/5? 12c. What percentage corresponds to l/100? 13d. If 66 subjects were studied and 21 of them expressed Opinion X, what percentage of them expressed Opinion X? 14f. If 462 subjects were studied and 99 of them expressed a preference for Brand Y, what percentage expressed a preference for Brand Y? 15h. When writing a scientific rep01i, there is no need to report Ns if percentages are being reported. TRUE or FALSE? 16j. In statistics, the uppercase P stands for percentage. TRUE or FALSE?
Social media is becoming more and more popular around the world. Suppose a website provides estimates of the number of social media users in various countries. Assume that the results for surveys in the United Kingdom, China, Russia, and the United States are as follows. Use Social Media Yes No United Kingdom 480 320 Country China Russia 235 265 343 Need Help? 357 O Ho: All population proportions are not equal. H₂: P₁ = P₂ = P3 = P4 Read It OHO: Not all population proportions are equal. Ha: P₁ = P₂ = P3 = P4 (a) Conduct a hypothesis test to determine whether the proportion of adults using social media is equal for all four countries. State the null and alternative hypotheses. O Ho: P₁ = P₂ = P3 = P4 H₂: Not all population proportions are equal. United States 620 380 Ho: P₁ = P₂ = P3 = P4 H: All population proportions are not equal. Find the value of the test statistic. (Round your answer to two decimal places.) What is the p-value? (Round your answer to four decimal places.) p-value =…
A biologist wants to estimate proportion of humans who have a certain gene. He wants to be 95% confident that the true proportion is within 5% of the sample proportion. What should his sample size be? Select one: а. 385 b. More information is required. C. 1537 d. 384 e. 96
According to a census company. 7 1% of all bables bom are of low birth weight. An obstetrician wanted to know whether mothers between the ages of 35 and 39 years give birth to a higher percentage of low-birth-weight babies. She randomly selected 240 births for which the mother was 35 to 39 years old and found 28 low-birth-weight bables. Complete parts (a) through (c) below. (a) lf the proportion of low-birth-welght babies for mothers in this age group is 0.071, compute the expected number of low-birth-weight births to 35- to 39-year-old mothers. What is the expected number of births to mothers 35 to 39 years old that are not low birth weight? The expected number of low birth-weight births to 35- to 39-year-old mothers is The expected number of births to mothers 35 to 39 years old that are not low birth weight is (Type integers o decimals)
b. You analyze the following four vinegars in the lab and obtain the results indicated in the table. If you are going to need a large quantity of vinegar and want to get the most acetic acid for your money, which brand of vinegar should you buy? Explain your reasoning. Vinegar Cost/Qt. Weight % Acetic Acid Piedmont white $0.51 4.47 Piedmont cider $0.59 4.52 $0.62 5.02 Heinz white 5.05 $0.71 Heinz cider

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