Sandra is conducting market research on the public's perception of a new advertising campaign.  As part of the study, a poll will be given out to a number of randomly selected adults living in the tri-state area. The proportion of those in the sample who respond favorable to the advertising campaign will be used to estimate the true population proportion of all adults in the tri-state area who respond favorably. Sandra wants to report a margin of error of no more than 0.02 in her results at the 95% confidence level. What is the minimum sample size Sandra much use to ensure her desire margin of error?

Q: If you want a poll to have a margin of error of 2.84%, how large will your sample have to be?

A:

Q: 7:21 A ll 85% A news article that you read stated that 51% of voters prefer the Democratic…

A: a. It is observed that the test is one prop Z test. b. Hypotheses: Let p be the proportion of voters…

Q: Your professor wishes to estimate the proportion of high school students enrolled in college-level…

A: Given: margin of error of 3.5 percent 99% confidenp p= 18.3%

Q: According to a census company, 7.1% of all babies bon are of low birth weight. An obstetrician…

A: H0 : p = 0.071 H1 : p > 0.071   Observed value of low birth = 28 Observed value of not low birth…

Q: A stats class was interested in determining the percentage of students on their campus who are…

A: Given Information: Sample size n=95 proportion p1=0.35 Margin of error E=0.098 Second case: Sample…

Q: A regional government is interested in expanding the facilities of a day care center for mentally…

A: Given information: It is given that stratified sampling is used with people in the city using the…

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: company in this town conducted an opinion poll to examine the party's support just before the 2014…

A: The sample proportion,i.e.,the proportion of voters who intend to vote for Pírata is calculated as,…

Q: Because of the increased cost of housing, a national real estate board wants to compare the…

A:

Q: Hurricane Andrew swept through southern Florida causing billions of dollars of damage. Because of…

A: Step 1:Determine the given variables n=26,σ=5500,Xˉ=27500,μ=25000,α=0.10Step 2:Hypotheses…

Q: Use these data to construct a 90% confidence interval to estimate the population mean value. Assume…

A:

Q: A recent survey found that 58% of U.S. adults use their smartphones to research and shop for…

A: The expression is  The margin of error is given as 5.3%.

Q: Nocaf Drinks, Inc., a producer of decaffeinated coffee, bottles Nocaf. Each bottle should have a net…

A: The provided information is as follows:The data set is given as: SampleSample RangeSample…

Q: women (combining employment and at-home work). Suppose a study was done to determine if the average…

A: (d) As the population standard deviation is not known, we will use t-distribution. tdf The…

Q: Hurricane Andrew swept through southern Florida causing billions of dollars of damage. Because of…

A: Step 1:Determine the given variablesn=26,σ=5500,Xˉ=27500,μ=5500,α=0.10Step 2:Hypotheses…

Q: A multinational firm hired a consultant to determine if the workers in their domestic plants were…

A: Given Information : A multinational firm hired a consultant to determine if the workers in their…

Q: In politics, marketing, etc. we often want to estimate a percentage or proportion p. One calculation…

A: From the given data we can conclude that, Proportion = 25% Margin of error = 1.3%

Q: A researcher wants to calculate the prevalence of Alzheimer’s among members of a specific community…

A: Solution: Given information: Margin of error = E= 0.01 Population proportion = p = 0.1073 Confidence…

Q: In politics, marketing, etc. we often want to estimate a percentage or proportion p. One calculation…

A: Given: The proportion of people who like dark chocolate more than milk chocolate is 32% Margin of…

Q: One of the biggest issues facing e-retailers is the ability to turn browsers into buyers. This is…

A: Using  z test for single proportion  test.

Q: The local school is conducting another survey to determine the proportion of students at the school…

A: Confidence interval is defined as the range that contains the value of the true population…

Q: se 95% CI.

A: Given that  An environmentalist is interested in the opinions of adults on the issue of global…

Q: Hurricane Andrew swept through southern Florida causing billions of dollars of damage. Because of…

A: In hypothesis testing, we start by stating the null hypothesis (H0) and the alternative hypothesis…

Q: An auto shop wants to examine the proportion of customers that have to return after an appointment.…

A:

Q: In 2007, the CDC reported that approximately 6.6 per 1000 (0.66%) children were affected with autism…

A:

Q: The Vegetarian Resource Group commissioned Harris Poll in 2016 to conduct a nationally…

A:

Q: In politics, marketing, etc. we often want to estimate a percentage or proportion p. One calculation…

A:

Q: State the distribution to use for the test (Enter your answer in the form z or tar where af is the…

A: n =77mu = 80xbar = 83s = 10

Q: According to a census company, 7.1% of all babies born are of low birth weight. An obstetrician…

A: Here we conduct Z test for proprtion.

Q: Thirty-three percent of all Americans drink bottled water more than once a week (Natural resources…

A: Note: Hi there! Thank you for posting the question. Unfortunately in the sub-part(b), some required…

Q: A researcher is running a study to determine the proportion of men that wear neckties to work. To…

A: Since, we answer only first three sub-parts of a question, we will answer the first three. Please re…

Q: should their sample size be?

A: here use solvin's formula

Q: Hurricane Andrew swept through southern Florida causing billions of dollars of damage. Because of…

A: The given values are:Sample size (n) = 24Sample mean (x̄) = $28,500Population standard deviation (σ)…

Q: In the Star and Tribune newspaper, there is an article entitled “1 in 8 school buses fail tests."…

A: Given information: Sample of 200 buses and find that 20 buses fail the safety inspection. Let us…

Q: Dolling is a popular technique used to determine the outcome of an election prior to results being…

A: Given that  Population proportion p=0.51 Sample size n =400

Q: The workers at drug factory took a random sample of 800 drug tablets and found that 40 of them were…

A:

Q: Hurricane Andrew swept through southern Florida causing billions of dollars of damage. Because of…

A: In hypothesis testing, we start by stating the null hypothesis (H0) and the alternative hypothesis…

Q: Type O-negative blood type is called the universal donor type because it is compatible with any…

A: Given: Sample size is n =300. Sample number of individuals to have type O-negative blood type is x =…

Q: As chairperson of the Rogers County Task Force on Aging, you wish to estimate the proportion of…

A: Sample size n =44 Favorable cases x =22 Sample proportion p^=x/n  =22/44 =0.500

Q: In politics, marketing, etc. we often want to estimate a percentage or proportion p. One calculation…

A: Here the proportion of people liking dark chocolate is 37% with a margin of error 2.5%  So, the…

Q: After an introductory statistics course, 60% of students can successfully construct box plots. Of…

A: Given Information: 60% of students can successfully construct box plots Of those who can construct…

Q: If we construct a 95% confidence interval estimate for the true proportion of all Minnesota school…

A: here given, n = 200 sample proportion  =20200 = 0.1 here for z-critical use excel command…

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.