**Chapter 8: Confidence Intervals** **Question 8:** A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 4% margin of error at a 95% confidence level, what size of sample is needed? Provide your answer in whole people. **Options for Assistance:** - **Written Example** - **Message Instructor** [Submit Question]

Q: A car dealer plans to take a customer satisfaction survey with a sample size of 100 customers. Assu...

A: 1. Given n=100 and p=0.5 To find the 95% confidence interval: The standard error is, S.E.p=p1-pn=0.5...

Q: Assume that different groups of couples use a particular method of gender selection and each couple ...

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Q: A particular fruit's weights are normally distributed, with a mean of 555 grams and a standard devia...

A: A particular fruit's weights are normally distributed, with a mean of 555 grams and a standard devia...

Q: A tire manufacturer warranties its tires to last at least 20207 miles or "you get a new set of tires...

A: a) Given μ=26207σ=5138 The probability that a set of tires wears out before 20207 miles is, P(X<2...

Q: Some electronic devices are better used than new: The failure rate is higher when they are new      ...

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Q: The average fruit fly will lay 400 eggs into rotting fruit. A biologist wants to see if the average ...

A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want solution...

Q: Whenever Suzan sees a bag of marbles, she grabs a handful at random. She has seen a bag containing t...

A: From the provided information, Total red marbles in bag = 3 Total green marbles in bag = 4 Total whi...

Q: Listed below are amounts (in millions of dollars) collected from parking meters by a security servic...

A: https://drive.google.com/file/d/1DCIXzOc8OriCrM3VcuA8-1wtxEBZXlw6/view?usp=sharing

Q: A certain virus infects one in every 600 people. A test used to detect the virus in a person is posi...

A: A: The person is infected B: The person tests positive P(A)=1600,P(B|A)=0.9,P(B|Ac)=0.1 a.)The proba...

Q: Cost accountants often estimate overhead based on the level of production. At the XYZ Company, they ...

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Q: A hypothesis test is conducted to test whether the mean age of clients at a certain health spa is eq...

A: Let,       μ denote the population mean σ denote the population standard deviationn denote the sampl...

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe t...

A: Since we know population standard deviation, use z-distribution to find z-critical value. Refer S...

Q: Let X have an exponential distribution with pdf 1 f(x) , r>0 and 8 >0 Find the CDF F(t) = P(X 0 is ...

A: Since you have posted a question with multiple subparts we will solve the first 3 complete subparts ...

Q: Urgent

A: a) Given: P (drink) = 0.58 P (popcorn | drink) = 0.18

Q: As part of your work for an environmental group, you want to see if the mean amount of waste generat...

A: Given Information: Hypothesized mean = 5 pounds Sample size = 27 Sample mean = 4.4 pounds Sample sta...

Q: Suppose we have an unfair (biased) coin, for which the chance of the coin landing heads is 0.6. Let ...

A: The probability distribution of X for geometric distribution for r failures before the first success...

Q: 59% of students entering four-year colleges receive a degree within six years. Is this percent large...

A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want solution...

Q: The Prevalence per 10,000 population of having health insurance for 1 (Table 5 box s.  above) is:  T...

A: For 1,  Have health insurance Population size Calculation Prevalence Calculation Prevalence (per ...

Q: The average salary for American college graduates is $45,100. You suspect that the average is less f...

A: Concept: The one-sample t-test is a statistical technique that used to define whether a sample of da...

Q: A poll is given, showing 55% are in favor of a new building project. If 10 people are chosen at rand...

A: Number of samples (n) = 10 propobabilty of success (p) = 0.55 Let "X" be the people who are in favo...

Q: The grade point average of students at a university is normally distributed, with a mean of 2.6 and ...

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Q: The average student-loan debt is reported to be $25,235. A student believes that the student-loan de...

A: The Student’s t sampling distribution is sued, since the sample size is large and the population sta...

Q: The estimated distribution (in millions) of the population by age in a certain country for the year ...

A: From the given pie chart,   Midpoint Frequency Under 4 years 2 24.2 5-14 years 9.5 46.5 15-...

Q: Urgent and important question 1st

A: The hypotheses are given below: Null hypothesis: H0: Silicon chip sales are independent of XYZ count...

Q: Suppose that insurance companies did a survey. They randomly surveyed 430 drivers and found that 350...

A: The distribution we should use for the problem is, N(350.0200, 65.1037) Where, mean = np = 430×0.814...

Q: Assume that when an adult is randomly selected, the probability that they do not require vision corr...

A: Let "X" be the adults who don not require vision correction.

Q: A research company has designed three different systems to clean up oil spillages. The following tab...

A: The claim of the test is to check whether the significant difference in the testing of effectiveness...

Q: Each year a magazine publishes a list of the richest people in the country. N the last years issue, ...

A: Given that, The data on wealth of the six people as follows: 70, 57, 42, 38, 38, 35

Q: A recent survey in Michigan revealed that 60% of the vehicles traveling on highways, where speed lim...

A: Solution: Let X be the number of vehicles that were exceeding the limit and n be the sample number o...

Q: For the following frequency table calculate mean median and mode. Class Interval |10-13 Frequency 08...

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Q: Dr. Smith administered a test to her statistic class with 25 questions that were worth one point eac...

A: If n is multiplied by each observation, the new value for mean is, E(n×X) = nE(X) If n is multiplied...

Q: A sample of 101 wealth-market mutual funds was chosen on February 1, 2016, and the average annual ra...

A: To test H0:μ1=μ2H1:μ1>μ2 Let sample drawn in year 2016 be sample 1 and sample drawn in year 2015 ...

Q: Scenario #1 As the Finance Manager of an accounting firm, you were given the following employees’ pe...

A: The given table is: Grade Employees (f) CF 50-59 3 3 60-69 5 8 70-79 9...

Q: looking for help with c

A: The null and alternative hypotheses are, H0: There is no significant difference between four differe...

Q: Suppose the results indicate that the null hypothesis should not be rejected; thus, it is possible t...

A: Type II error: Failing to reject the null hypothesis, when it is false. Here, it is given that type ...

Q: The content of the advertisement you just watched can be characterized as:    1 2 3 4 5 ...

A: The content of advertisement is characterized as: 1       2       3      4      5 Boring            ...

Q: A research company has designed three different systems to clean up oil spillages. The following tab...

A: Null Hypothesis:   H0: There is no difference in the testing of effectiveness of the three systems. ...

Q: QUESTION 1 Questions 1-4 Listed below are the top 10 annual salaries (in millions of dollars) of TV ...

A: Given: Top 10 annual salaries (in million of dollars) of TV personalities. 38.8, 36, 35.2, 27.6, 15....

Q: A sample is selected from a population with a mean ofm 5 65 and a standard deviation of s 5 15.a. If...

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