In March 2015, the Public Policy Institute of California (PPIC) surveyed 7525 likely voters living in California. PPIC researchers find that 68 out of 200 Central Valley residents approve of the California Legislature and that 156 out of 300 Bay Area residents approve of the California Legislature. PPIC is interested in the difference between the proportion of Central Valley and Bay Area residents who approve of the California Legislature.  Find and interpret a 95% confidence interval to estimate the difference between the proportion of Central Valley and Bay Area residents who approve of the California Legislature.

Q: 3- Car and Driver Magazine tested a random sample of 9 hybrid cars and found their MPG to be 42, 51,…

A:

Q: In the NFL, Coaches can throw "challenge" flags if they believe officials have made an incorrect…

A:

Q: A research study wishes to examine if there is a relationship between type of exercise (marathon,…

A: Steps to Determine the Critical Value:1. **Set up the Hypotheses:**  - **Null Hypothesis (H0):**…

Q: Thirteen out of the 137 randomly selected faculty members who were surveyed at a community college…

A: Obtain the 90% confidence interval for the proportion of all faculty member at the community college…

Q: joint USA Today/CNN/Gallup Poll in July 2020 indicated that of 832 white adults, 46% thought…

A: Given n=832 P=0.46

Q: A local news outlet reported that 56% of 600 randomly sampled Kansas residents planned to set off…

A: We have given that,  Sample proportion (p̂) = 56% = 0.56 and sample size (n) = 600 Then,  We will…

Q: At the 5% level, is there enough evidence to show that the proportion of Australians in November…

A: It is given that Sample size n = 631 Number of Australian thought unemployment would increase, X =…

Q: The Bangor Humane Society tracks cat adoptions closely, and in the past has seen 60% of people who…

A: We know if we have sample size n and number of success is X then, proportion of success is    p^ =…

Q: shorter than 60 hours

A: For the given data : sample size, n = 10 sample mean, x̄ = 59.5 sample standard…

Q: A survey of 225 randomly chosen commuters are asked if they support an expanded public…

A:

Q: In a study by Sallie Mae and Gallup, 223 of the 934 respondents said that they paid for their…

A: Obtain the 95% confidence interval for the proportion of students who paid for their education by…

Q: In 2013, Steve LeCompte, a stock market trader and analyst, did a study to see which TV…

A: We have given that  Sample size n =678 Favorable cases x =320 Sample proportion p^=x/n  =320/678…

Q: In an October 2003 poll conducted by the Gallup organization, 684 of 1006 randomly selected adults…

A: Point estimate:The point estimate of population proportion is sample proportion.

Q: In the NFL, Coaches can throw "challenge" flags if they believe officials have made an incorrect…

A: Given n(sample size)=316 x( no. of success) =154

Q: Ms. Lisa Fong is considering running in the election for the HKBU Student Union President. Before…

A:

Q: It is known that ticks in York County carry the Lyme disease.  In a representative sample of 200…

A: Let n=sample size, X=number of Carry disease. p^=x/n  X=167, n=200

Q: Hours of Sleep Fewer than 6 6 to 6.9 7 to 7.9 8 or more Total er 38 60 77 65 240 36 57 75 92 260 est…

A: *Answer:

Q: A study compares students who use a website and students who do not use the website. In addition to…

A: The two samples (141 students who were users of the website and 68 students who were not users of…

Q: The General Social Survey determined in 2016 that 57% of US Residents think that the use of…

A:

Q: The College of Graduate Studies at MNSU claims that more than 60% of undergraduate students at this…

A:

Q: A study of all 2093 employees of a company shows that 54% are satisfied with the company's health…

A: Definition  Statistic: Statistic may be defined as which one is based on the sample  Parameter:…

Q: 3) Prior to the 2013 BCS National Championship Game between Notre Dame and Alabama, a poll asking…

A: 3) The sample proportion of all college students who said Alabama would win is,…

Q: In 2010, shortly before a country's midterm elections, people in that country were dissatisfied with…

A: P=0.57 P-cap=0.61 n=1067

Q: As customer satisfaction manager for a large utilities company, you randomly select 200 customer…

A: We have given that n = 200 x = 21 Confidence level (c) = 95% = 0.95

Q: P Mbos (Type an integer or a decimal. Do not round

A: Obtain the 20th percentile.’   The value of the 20th percentile is obtained below as follows:   The…

Q: A poll asked whether states should be allowed to conduct random drug tests on elected officials. Of…

A: n = 21410 p^ = 0.72 99% ci for p

Q: The National Technology Readiness Survey sponsored by the Smith School of Business at the University…

A: Denote p2009 and p2004 as the true population proportions of spam emails deleted by Americans in…

Q: What decisions can be made on the basis of The Harris Poll survey that measures the reputations of…

A:

Q: In 2013, Steve LeCompte, a stock market trader and analyst, did a study to see which TV…

A: Since you have posted a question with multiple sub-parts, we will solve the first three subparts for…

Q: school administrator claims that 85% of the students at his large school plan to attend college…

A: Given that ; Sample size (n) = 50 P = 85 %  P(cap) = 76%  By using one sample proportion test we get

Q: the 1920's about 97% of the U.S. colleges and universities required a physical education course for…

A:

Q: Suppose a presidential candidate wants to compare the preferences of registered voters in the…

A: Given data, For North eastn1=1500x1=546Proportion is p1=5461500=0.364 For South…

Q: In the NFL, Coaches can throw "challenge" flags if they believe officials have made an incorrect…

A: It was stated that in the NFL, Coaches can throw "challenge" flags if they believe officials have…

Q: In a survey conducted by the Gallup organization September 6-9, 2012, 1,017 adults were were asked…

A:

Q: A survey of 225 randomly chosen commuters are asked if they support an expanded public…

A:

Q: A study showed that 62% of supermarket shoppers believe supermarket brands to be as good as national…

A: claim is that the percentage of supermarket shoppers who believe that the supermarket ketchup was as…

Q: A sociologist wishes to conduct a poll to estimate the percentage of Americans who favor affirmative…

A: From the given information, she wants to use a 2003 estimate of 55% obtained from a Gallup Youth…

Q: A radio news story claimed that half of all U.S. adults have Internet access. In a national poll…

A:

Q: A social scientist wanted to study the education levels of adults who live in the tristate area of…

A: Given information:   Ohio West Virginia Pennsylvania HS 4 7 3 Bachelors 18 15 17 Master's…

Q: In a past presidential​ election, 37,979,113 people voted for Candidate​ A 37,758,117 for Candidate​…

A: a. In the past presidential​ election, 37,979,113 people voted for Candidate​ A; 37,758,117 for…

Q: A local bank has three branch offices. The bank has a liberal sick leave policy, and the CEO was…

A: Given : Source df SS MS F Treatments 2 89.8333 44.9167 6.2056 Error 7 50.6667 7.2381…

Q: Gay marriage. In May 2012, a CNN/ORC Poll asked arandom sample of 1009 U.S. adults this question:Do…

A:

Q: what is Nonresponse bias?

A: Non response bias is also known as participation bias.

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.