You have been asked to estimate the proportion of households in Chicago that have two or more vehicles.   a) How many households would you need to sample to be within 1.5 percent of the proportion of all households in Chicago that have two or more vehicles at a 95% level of confidence.     b) You conduct a small preliminary sample, and you obtain a sample proportion of 20% that have two or more cars. Using this new information, what sample size should you gather in order to be within 1.5 percent of the proportion of all households in Chicago that have two or more vehicles at a 95% level of confidence.

Q: Before beginning a new and costly advertising campaign, Starbucks would like to know how best to…

A: b) Null Hypothesis: H0: There is no association between Gender and Coffee consumption. Alternative…

Q: Since the patients agree to respond, is this considered a voluntary response sample? Justify your…

A: The objective of the question is to determine whether a sample where patients agree to respond can…

Q: Extroverted Introverted Clergy 62 45 M.D. 68 95 Lawyer 56 81

A:

Q: 4) Annual expenditures for prescription drugs was $838 per person in the Northeast part of the…

A: 1:  2:

Q: Give a sample of a research proposal?

A: Developing a research proposal involves the following preliminary steps: identifying potential…

Q: An article estimated that 80 percent of students at a large public university who are Facebook users…

A: According to the given information in this question, we need to identify the correct option

Q: The State Superintendent of Schools consistently states that the average salary of all substitute…

A: Given Information: Sample size (n) = 8 The state superintendent of schools states that the average…

Q: Dr. Spike is a big fan of Bojangles and is particularly interested in the popularity Its celebrated…

A: Given that - Dr. Spike is a big fan of Bojangles and is particularly interested in the popularity of…

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: In 1941, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you…

A: We have given that For the survey taken in 1941 n1 = 1100x1 = 374p̂ = x1/n1 = 151/429 = 0.3520 And…

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: You may need to use the appropriate technology to answer this question. During the first 13 weeks of…

A: Chi square χ2 test : Chi square test is used to test whether the distributions of categorical…

Q: Before beginning a new and costly advertising campaign, Starbucks would like to know how best to…

A: Given data, Coffee Female Male Consumes more than 2 cups 560 295 Consumes 1-2 cups 163 72…

Q: You are told that a study is a 3 x 3 ANOVA. Make up variables and conditions for such a study, and…

A: In Following example shows Make up variables and conditions for such a study, and create a diagram…

Q: 1. Scientists want to know whether people who exercise with music have a greater increase, on…

A: Given 2 methods to determine whether people who exercise with music have a greater increase, on…

Q: 2. The lengths of two different types of snakes are being compared. A sample of 12 Type A snakes was…

A:

Q: Assuming a sample size of​ 1,000 for this​ poll, construct a 90​% confidence interval for the true…

A: It is given that Sample size n = 1000 Sample proportion = 0.62 The critical value of z at 90%…

Q: The recidivism rate for convicted sex offenders is 12%. A warden suspects that this percent is lower…

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

Q: The National Highway Traffic Safety Administration requires each U.S. state to carry out an…

A: The objective is to find the required probabilities.

Q: recent study reported that 12% of people toss away about half of what they buy at the grocery store.…

A: From the given information we conduct Z test for proportion.

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: The most important advantage of experiments over observational studies is that . a confounding…

A: Experiments give better evidence of causation.

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: Mr. Fahad is planning to study the relationship between salary and expenditure of the private sector…

A: Mr. Fahad is planning to study the relationship between salary and expenditure of the private sector…

Q: Reach out to a family member, older friend, or another professor and ask them whether they feel that…

A: Larger samples tend to be more accurate than smaller samples if the samples are chosen randomly. The…

Q: We asked students in our class about the reading time per day. We got 57 responses (the sample size…

A: given data n = 57x = 4390% ci for p

Q: Dr. House is leading a study to determine whether a new drug could significantly improve memory loss…

A: Dr. House is leading a study to determine whether a new drug could significantly improve memory loss…

Q: The director of student services at Oxnard College is interested in whether women are more likely to…

A: Instruction : "please answer d, e, f" For Women: Sample size , n1 = 386 + 275= 661 sample…

Q: A school psychologist wants to test the effectiveness of a new method of teaching art. She recnuits…

A:

Q: The director of student services at San Bernardino Valley College is interested in whether women are…

A: From the provided information,

Q: Before beginning a new and costly advertising campaign, Starbucks would like to know how best to…

A: a) Level of significance = 0.01 Claim: Test whether there is any association between gender and…

Q: For the study described below, identify the population parameter and the sample statistic. "As…

A: Given that  As relationships, living arrangements and family life continue to evolve for American…

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

A:

Q: A pool of 500 Houston residents indicated that 16% of them participated in Women’s March on January…

A:

Q: Why a sample size of n=100 is more likely to have a percentage of pop songs closer to the population…

A: Sample of size 32 or greater is consider as large sample .

Q: should their sample size be?

A: here use solvin's formula

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.