A 95% confidence interval for the average salary of all CEOs in the electronics industry was constructed using the results of a random survey of 40 CEOs. The interval was ($99,752, $113,359). To make more useful inferences from the data, it is desired to reduce the width of the confidence interval. Which of the following will result in an increased interval width?

Q: In a survey funded by the UW school of medicine, 750 of 1,000 adult Seattle residents said they did…

A: Given X1=750 X1=893 n1=1000 n2=1123

Q: A 90% confidence interval for the proportion of coffee drinkers that add sugar and creme has results…

A:

Q: A doctor would like to estimate the mean difference in height of pairs of identical twins. The…

A: The correct inference regarding the given interval of (-0.823, 0.573) is to be made from the given…

Q: Each student drew a simple random sample of fifty students and created a 99% condfidence interval…

A: It is given that student has drawn a simple random sample of fifty students and created a 99%…

Q: A poll of 827 students at Alpha State College found that 61% of those polled preferred a quarter…

A: Given that Sample size n = 827 Sample proportion of students who prefer a quarter system = 0.61 The…

Q: Data for (3) A random sample of 100 statisticians were asked, "To what extent do you feel the…

A: Solution To draw the distribution pie chart is appropriate because the sample size is large and the…

Q: A volunteer wearing a caveman mask was scolded by 158 out of 444 crows he encountered, and the crows…

A: Given information, In a study, a volunteer wear a caveman mask scolded by 158 out of 444 crows he…

Q: A recent study was conducted in which a random sample of men and a random sample of women were…

A: Given:  Confidence Interval = (0.133,0.207) = (13.3%, 20.7%)

Q: The figure to the right shows the results of a survoy in which 1013 adults from Country A, 1001…

A: It was found that out of the 1013 adults from country A, 33% of the adults say national identity is…

Q: Two groups of students are selected to test different learning techniques. The test scores of group…

A: From the provided data we compute the mean and sample standard deviation for the group 1 and group 2…

Q: Relative risk is defined to be the ratio of success proportions between two groups. Suppose that a…

A: If the relative risk is 1, it indicates that there is no difference in the risk of the event between…

Q: Insurance companies are interested in knowing the population percent of drivers who always buckle up…

A:

Q: A 95% confidence interval for the proportion p active voters in the municipality of Aibonito is 0.57…

A:

Q: In studying his campaign plans, Mr. Singleton wishes to estimate the difference between younger…

A: sample size(n1)=769x1=497sample size(n2)=703x2=390confidence level=90%

Q: A political candidate feels that she performed particularly well in the most recent debate against…

A: From the provided information, 95% confidence interval for the true difference in proportions of…

Q: A sample of 100 homes in city A and 100 homes in City B was taken to estimate the proportion of the…

A: Given that, A sample of 100 homes in city A and 100 homes in city B were taken to estimate the…

Q: 24 A jam manufacturer claims that the mean amount of jam in its 5-ounces jars is 5.1 ounces. A…

A:

Q: Moderna’s COVID-19 vaccine was tested in 30,000 people. Half received the vaccine, and half received…

A: Note: As per the guidelines , only first three sub-parts have been solved. Given: Sample size of…

Q: d their candidate. State your answers as percents rounded to 1 decim

A: Here it is given that -  Of the 619 randomly selected likely voters surveyed, 305 supported their…

Q: The figure shows the results of a recent Marist poll asking about President Biden’s approval rating.…

A: *Answer:  Given the results of a recent Marist poll asking about President Biden’s approval rating.

Q: A principal of a large high school wants to estimate the true proportion of high school students who…

A: Given information- Sample size, n = 50 For a random sample of 50 students, the 95% confidence…

Q: Determine the size of each sample. nE = (Type integers or decimals. Do not round.)

A: The size of males is, nM=174+370=544 Thus, the size of males is 544.

Q: Out of all the students that attend Yale University, 1,982 were selected to participate in a school…

A:

Q: A  campaign wants to construct 90% confidence interval for the proportion of likely voters who…

A: Find z-critical value.

Q: A recent survey of 54,000 randomly selected adults studied the religious affiliations of Americans.…

A: From the provided information, Sample size (n) = 645 From which 116 said they claimed no religious…

Q: A sample of size 84 was taken from a very large population. Sample statistics, x¯ and s, were used…

A:

Q: Google is studying the quality of results returned by an upgraded version of its search engine.…

A: From the given information, it can be observed that x = 23 and n =100.

Q: A survey​ asked, "How many tattoos do you currently have on your​ body?" Of the 1238 males​…

A:

Q: Insurance companies are interested in knowing the population percent of drivers who always buckle up…

A: Confidence intervals is an inference process which can be used to estimate the population parameter.…

Q: Ethan is surveying students who are interested in watching television (TV) shows. Ethan has surveyed…

A:

Q: A random sample of high school students is used to estimate the mean time all high school students…

A: Solution: From the given information, a 99% confidence interval is 1.7 hours to 3.1 hours.

Q: An educator want to determine whether early exposure to school affect IQ. He enlists the aid of…

A: We set up the, Null Hypothesis(H0):μx=μy , there is no diffrence between the mean IQ of children who…

Q: Most married couples have two or three personality preferences in common. A random sample of 384…

A: Obtain the 95% confidence interval for the difference between two population proportions. The 95%…

Q: In studying his campaign plans, Mr. Singleton wishes to estimate the difference between younger…

A: sample size(n1)=769x1=497sample size(n2)=703x2=390confidence level=90%

Q: A political candidate feels that she performed particularly well in the most recent debate against…

A: We have given that 95% confidence ( -0.014, 0.064) We have to compute margin of error

Q: In a clinical trial of a certain drug, 30 subjects experience headaches among the 220 subjects…

A: Step 1: State the given: number of favorable cases, x = 30sample size, n = 220confidence level =…

Q: Out of 800 adults selected randomly from one town, 272 have health insurance. Find a 90% confidence…

A: Given,   The sample proportion is,

Q: In a survey of 2480 golfers, 15% said they were left-handed. The survey's margin of error was 3%.…

A: Sample size(n)=2480sampl proportion(p^)=0.15Margin of error(E)=0.03

Q: A 90% confidence interval for the average salary of all CEOS in the electronics industry was…

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

Q: A student polls his school to see if students in the school district are for against the new…

A: Given,n=400x=85p^=xnp^=85400=0.21251-p^=1-0.2125=0.7875α=1-0.90=0.1α2=0.05Z0.05=1.645    (from…

Q: A marketing research company is estimating which of two soft drinks college students prefer. A…

A:

Q: In a survey of 1002 people, 70% said that they voted in a recent presidential election. In…

A: n=1002

Q: statistics class took a random sample of students at the school to find the proportion of those who…

A: Given that  Sample sizes n1=75 , n2=45 Favorable cases x1=12 , x2=9

Q: 5. At Community Hospital, the burn center is experimenting with a new plasma compress treatment. A…

A: It is given that  For sample 1: Favourable cases, X1 = 259 Sample size, n1 = 316 For sample 2:…

Q: A group of researchers is interested in middle school students and their willingness to appear to…

A:

Q: A state legislator wants to determine whether his voters' performance rating (0 - 100)(0 - 100) has…

A: Given: n = 10 Confidence level = 95% Formula Used: Confidence Interval = d ± t*sdn

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.