Astrology A sociologist plans to conduct a survey to estimate the percentage of adults who believe in astrology. How many people must be surveyed if we want a confidence level of 99% and a margin of error of four percentage points? a. Assume that nothing is known about the percentage to be estimated. b. Use the information from a previous Harris survey in which 26% of respondents said that they believed in astrology.

Q: Suppose we have data from a sample. The sample mean is 32, and the error bound for the mean is 2.4…

A: From the provided information, Sample mean (x̅) = 32 Error bound (E) = 2.4 Confidence level = 95%

Q: Use the confidence interval to find the margin of error and the sample mean? 13. (14.7,22.1)

A:

Q: 4. A newspaper reports on the topics that teenagers most want to discuss with their parents. The…

A: Here, the proportion of all teenagers who want more family discussions about religion 0.30 and the…

Q: d. Referring to parts b and c, construct and interpret the 99% confidence interval estimate for the…

A: Given data, 2,2.75,1.75,1.25,1.75,2,0.50,2.50,1.50,1.75,2,1 Sample mean is =∑xn=20.7512x=1.72916…

Q: na survey, the planning value for the population proportion is p* = 0.25. How large a sample should…

A:

Q: 26)   For the same sample statistics, which level of confidence would produce the widest…

A: We have to find  correct option.

Q: researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 520…

A:

Q: a.What percentage of the sample of 790 college graduates said they wished they had studied harder?…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: A national poll found that 684 people out of 1100 believe in UFO’s. Answer the following questions.…

A: Given data,Number of people n=1100People who believe in UFO is x=684Find the 94% confidence interval

Q: 例题3: Based on a survey of a random sample of 900 adults in the United States, a journalist reports…

A:

Q: 3. The American Medical Association (AMA) wishes to determine the percentage of obstetricians who…

A: Formula for the sample size needed to estimate a population proportion is

Q: Use the sample data and confidence level given below to complete parts​ (a) through​ (d). A research…

A:

Q: Which choice is the correct formula for a 99% confidence interval for a mean? ?±?∗??√ ?±?∗??μ±z∗σn…

A:

Q: Complete the statement by filling in the blank. When constructing a confidence interval for a…

A: We want to tell you which one is the correct choice.

Q: 3. You plan to conduct a survey to find out what proportion of the workforce has two or more jobs.…

A:

Q: In the days before any election, it is best to decrease the margin of error of a poll to have a…

A:

Q: Wildlife biologists inspect 139 deer taken by hunters and find 29 of them carrying ticks that test…

A:

Q: Calculaté the mean and 90% confidence interval for the data Sample Value set. Report your answer…

A: Solution :

Q: Actual Poll information e 1,992 registered voters were ask "Based on what you know, do you believe…

A:

Q: esumate une difference hat you want 9976 confidenice hat your error is no more than 0.03. i Click…

A: Given ME=0.03 99% Confidence interval

Q: A survey asked, "How important is it to you to buy products that are made in America?" Of the 600…

A:

Q: d) What is the estimated difference in percent of bachelor's and master's students who are…

A: f) The 95% confidence interval for difference in percentage doesn't contain value 0, which means…

Q: The list below contains a number of statements about using confidence intervals of proportions.…

A: The objective is to find the true statement from the given list.

Q: Use the sample data and confidence level given below to complete parts​ (a) through​ (d). A…

A: From the provided information: n = 969 x = 500 a) The best point estimate of the population…

Q: According to a recent survey of 1187 voters, 64% feel that the president is doing an acceptable job.…

A: Given that in a survey 1187 voters are surveyed. Therefore n=1187 From the survey it is found that…

Q: 27. Call me: A sociologist wants to construct a 95% confidence interval for the proportion of…

A: It is given that margin of error (E) is 0.02 and the confidence level is 95%.Here,

Q: he following are confidence levels commonly used in testing? a. 50% b. 75% c. 95%

A:

Q: 5. Which of the following statements are correct? a. A confidence level expresses the degree of…

A: When we compute the confidence interval we get a 100(1-α)% confidence interval which is (a,b)…

Q: A state's Department of Education reports that 12% of the high school students in that state attend…

A: A confidence interval is a statistical concept that has to do with an interval that is used for…

Q: Use the sample data and confidence level given below to complete parts​ (a) through​ (d). A research…

A: Solution: A. From the given information, X=506 and n=955. Then, the point estimate of the population…

Q: Which of the following statements is correct about confidence intervals?

A: (A)  Incorrect  Since, on increasing the confidence level, the error bound increases. As one has to…

Q: political researcher takes a survey of 310 randomly selected registered voters in Orlando, and each…

A: Given that.  n=310 , Candidate A=110 , Candidate B=185 Unsure or plan to vote for another…

Q: Need asap. A magazine article conducted a survey of 1000 people in Washington State and found that…

A: A magazine article conducted a survey of 1000 people in Washington State and found that 26% of the…

Q: n=800 x=632 Example: The National Association of Music Merchants surveyed 800 parents of children…

A: Given: Sample size n = 800 successes = 632 failures = 168 Confidence level = 95% Formula Used:…

Q: Use the sample data and confidence level given below to complete parts​ (a) through​ (d).   A…

A: Given, The sample proportion is,

Q: a) Find the best point estimate of the population proportion p. b) Identify the value of the margin…

A: Let n denote the number of subjects selected randomly selected  from an online group involved with…

Q: State how you would respond to the following student posts in a discussion on how to interpret a 95%…

A: Solution: It is required to interpret the 95% confidence interval estimate for the population…

Q: Use the sample information �̅= 37, σ = 5, n = 36 to calculate the following confidence intervals for…

A: xbar = 37 s = 5 n = 36

Q: Trainers at a dog training facility find want to know how successful their recently updated program…

A: 250 owners with dogs randomly select; n=250 100 says yes if they consider their dog well behaved;…

Q: According to recent data by the American Marketing​ Association, 76.5​%of people in the​ 18-24 age…

A:

Q: We would like to create a confidence interval for the mean. Which of the following would produce the…

A: Margin of error = Width/2

Q: A survey asked, "How important is it to you to buy products that are made in America?" Of the 600…

A:

Q: Consider a 90 percent confidence interval to estimate a population proportion that is constructed…

A:

Q: 6.The boundaries of a confidence interval are called: (a) Confidence levels (b) The test statistics…

A:

Q: hat do you notice about the length of the confidence interval as the confidence level goes down? If…

A: We know that  Confidence interval (CI) = Point estimate ± Margin of error  From this we can say that…

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.