In a random sample of 800 adult Americans, 605 of them were nonsmokers.  The following question was asked:  Should the federal tax on cigarettes be raised to pay for health care reform? In this sample 351 nonsmokers and 41 smokers answered "yes."  Let p1 and p2 be the proportions of nonsmokers and smokers, respectively, in the general population of adult Americans who would answer "yes" to the question.  Use a significance level of 0.01 and an appropriate confidence interval to test the claim that there is no difference in the opinion of the two groups.

Q: According to past reports 51% of employees own a car. In a random sample of 106 employees, how many…

A: Total no.of employees(n)= 106 The percentage of employees own a car(p)= 0.51

Q: For observation study, determine whether cross-sectional, retrospective, or prospective is used.…

A: There are types of study, some of them are cross sectional, retrospective or prospective.…

Q: Determine the sample proportion. It has been determined with 95% confidence that the proportion of…

A:

Q: his box and whiskers was created from a random sample of new 1993 cars. The city gas milage (in…

A: The box and whisker plot for a random sample of new cars is provided in the question.

Q: Nationally, 83% of Americans have earned a high school diploma.  We want to see if the proportion of…

A: We have to find sample proportion.

Q: In 1955, Life Magazine reported that a 25-year-old mother of three worked (on average) an 80 hour…

A: Given that, Sample size of women n=67 Sample average x¯=83 Sample standard deviation s=10 It is been…

Q: Among 1815 randomly selected high school students surveyed by the Centers for Diseases Control, 300…

A: Given X=300 n=1815

Q: Professor X had the 22 students in his 10 A.M. Introduction to Marketing rate his performance as…

A: Given: The data given is shown below Excellent Good Fair Poor 94 75 70 68 90 68 73 70 85…

Q: A vaccine to prevent a severe virus was given to children within the first year of life as part of a…

A: a.It is given that x1=57, x2= 49, n1=3,294, n2= 1,648. .

Q: In a survey, 1000 respondents were asked about product preference. Of the interviewed, 65% favored a…

A:

Q: A guidance counselor at a university is investigating demand for study abroad. The question before…

A: Formula : CI=(p̂1- p̂2)± ME

Q: In each part, specify what type of analysis you might use. a. To study the effect of one factor on…

A: The study is an effect of one factor on the mean of a response variable.

Q: A national health survey weighed a sample of 260 boys aged 6-11 and found that 45 of them were…

A: Hypothesis Testing

Q: Find the mean, the median and the mode of the heights.

A: Mean is defined as the sum of observations divided by number of observation. Median is the middle…

Q: sample st. dev   Point estimate =                     Margin of the Error =   Show the Formula that…

A: The point estimate can be obtained using the excel formula “=AVERAGE(A1:A28)”. From the Excel…

Q: Calculate the appropriate measure of association and interpret the result

A:

Q: The city of Raleigh has 11,700 registered voters. There are two candidates for city council in an…

A: Consider x denotes voter supports Brown. Here, n = 350 and x = 178.

Q: Amage reported the results of its annual travel professionals survey. A total of 277 travel…

A:

Q: Health insurance benefits vary by the size of the company (the Henry J. Kaiser Family Foundation…

A: a:For the given data, the chi-square test for association is appropriate.Null Hypothesis:H0: The…

Q: a. Why is it more reasonable for Jeff to use the median, rather than the mean, to get a reas…

A: Jeff is looking to sell his Camaro. He compiles these prices from the newspaper for cars just like…

Q: A consumer magazine wants to figure out which of two major airlines lost a higher proportion of…

A: Given that  Sample sizes n1=620 , n2=400 Favorable cases x1=65 , x2=36

Q: Use these results from a USA Today survey in which 510 people choseto respond to this question that…

A:

Q: reasons, calf dehorning has become a routine practice at dairy farms. A report by a continental…

A: Answer The sample size [n] =635The favorable cases [x] = 513The population proportion [p] = 0.80

Q: A poll asked college students in 2016 and again in 2017 whether they believed the First Amendment…

A: It is given that-Number of students surveyed in 2016:People who believed the claim: Number of…

Q: D. What can you conclude about whether there was a significant difference between the scores of the…

A: Given:

Q: Suppose you take a sample of 25 Reese's pieces. The proportion of orange is 0.4. What is the p-value…

A: Solution

Q: 1. A Pew Poll taken in 2010 surveyed 830 randomly selected people ages 18 – 29, and found that 166…

A:

Q: Is the proportion of twin births among teenage mothers different from the overall figure?

A: It is given that Sample size n = 469 Number of twin births, X = 7 Level of significance = 10% = 0.10

Q: 395 out of 500 women were in favor with the new brand of skin whitening. What is the point estimate…

A:

Q: In a large clinical trial, 390,467 children were randomly assigned to two groups. The treatment…

A: Given that  The treatment group consisted of 197,083 children given vaccine in that 37 children…

Q: Compute the sample proportion of U.S. adults that avoid drinking regular soda or pop. Round your…

A: here given , A 2018 Gallup survey asked respondents to consider several foods and beverages and to…

Q: A survey is conducted to determine the opinions of people on global warming. In a random sample of…

A: Given: n=150 global warming is a serious world problem(x)=408

Q: The city council of Pine Bluffs is considering increasing the number of police in an effort to…

A: Regression is an important concept in statistics that finds its applications in various different…

Q: An online shop owner believes that 85% of her customers will want to go into a real store. She…

A: It is given that the an online shop owner believes that 85% of her customers will want to go into a…

Q: A Pew poll taken in 2010 surveyed 830 people aged 18-29 and found that 166 of them had one or more…

A: State the hypotheses.

Q: The mean price for used cars is $10,145 . A manager of a Kansas City used car dealership reviewed a…

A: State the hypotheses. That is, there is no evidence that the population mean price for used cars at…

Q: sixty-five percent of those surveyed reply No to a certain question. If 234 reply No, what is the…

A: Given 65℅ of S replied  No to a question, This number is given to be 234 so

Q: Twenty years ago, 56% of parents of children in high school felt it was a serious problem that high…

A: The hypothesized proportion is 0.56.

Q: A vaccine to prevent a severe virus was given to children within the first year of life as part of a…

A: There are two independent samples which are vaccine and placebo. We have to test whether the vaccine…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.