38 Is there a difference in preference for natural vs. artificial Christmas trees betweenrural and urban residents. From a random sample of 150 rural residents whodisplayed Christmas trees, 50 preferred natural. From a random sample of 160 urbanresidents who displayed Christmas trees, 40 preferred natural trees. What isthe pooled proportion? Round your answer to 2 decimal places and do NOT include azero before the decimal.

When the proportion of a something is calculated, it is basically the number of that particular…

Answered: Is there a difference in preference for…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 7CR

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Find the margin of error for the survey results described. During the questioning of 82 potential jury members, 33% said that they had already formed an opinion as to the guilt of the defendant.Give your answer as a percentage to one decimal place. 1.2% 5.5% 11.0% 22.1%
Based on the Nielsen ratings ,the local CBS affiliate claims its 11 p.m newscast reaches 43% of the viewing audience in the area. In a survay of 100 viewers .38% indicate that they watch the late evening news on this local CBS station. What is the sample proportional. ( Round to two decimals)
In a random survey of 1500 adults in California and 1000 adults in Oregon, you found that 228 smokers were from California and 185 smokers were from Oregon. Compute the pooled proportion, writing as a 4 place decimal.
A manager for Shopee wants to determine the current percentage of Filipino adults who now use the Internet. How many adults must be surveyed in order to be 95% confident that the sample percentage is in error by no more than three percentage points when: * A. In 2020 , 73% of adults used the internet B. No know possible value of the proportion
An automotive manufacturer wants to know the proportion of new car buyers who prefer foreign cars over domestic. Suppose a sample of 1164 new car buyers is drawn. Of those sampled, 325 preferred foreign over domestic cars. Using the data, estimate the proportion of new car buyers who prefer foreign cars. Enter your answer as a fraction or a decimal number rounded to three decimal places.
The head of a computer science department is interested in estimating the proportion of students entering the department who will choose the new computer engineering option. Suppose there is no information about the proportion of students who might choose the option. What size sample should the department head take if she wants to be 95% confident that the estimate is within 0.04 of the true proportion?
A national polling organization wants to be 95% confident that its estimate of the percent of registered voters who say they plan to vote for a particular candidate will be within three percentage points (.03) of the true proportion that plan to vote for her. a) How large a sample do they need if the number of registered voters who plan to vote for her is in fact around 50%? b) How large a sample will they require for a margin of error of just one percentage point (.01)?
In a survey of 1150 adult males, 805 said they use the Internet. In a survey of 1050females, 746 said they use the Internet. Atα= 0.05, can you reject the claim that the proportion of Internet users are the same for both groups?
The executives at Sandbachian, inc., having recently solved their widget crisis, have another problem with one of their products. Many cities are sending complaints that their manhole covers are defective and people are falling into the sewers. The workers took a random sample of 800 manhole covers and found that 40 of them were defective. What is the 95% CI for p, the true proportion of defective manhole covers, based on this sample?
A quality conscious disc manufacturer wishes to know the fraction of disks his company makes which are defective. Step 1 of 2: suppose a sample of 865 floppy disks is drawn. Of these disks, 112 were defective. Using the data, estimate their proportion of disks which are defective. Enter your answer as a decimal number rounded to three decimal places.
80 students at a college were asked whether they had completed their required English 101 course, and 48 students said "yes". Find the best point estimate for the proportion of students at the college who have completed their required English 101 course. Round to four decimal places.
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