In a random sample of 85 automobile engine crankshaft bearings, 10 have a surface finish that is rougher than the specifications allow. Therefore, a point estimate of the proportion of bearings in the population that exceeds the roughness specification is ̂p = x∕n = 10∕85 = 0.12. Compute for a 95% two-sided confidence interval of p?

Q: In a sample of 16 fish from my pond it was found that 5 are under 165 grams in weight. Based on this…

A: Given  n=5 p= 5/16 = 0.312 1-p = 1-0.312 = 0.688 Standard error SE = p(1-p)/n

Q: A random sample of 100 teachers in a large metropolitan area revealed a mean weekly salary of $487…

A: Obtain the 95% confidence interval for the population mean weekly salary. The 95% confidence…

Q: Calculate the 95% and 99% population proportion confidence intervals for this finding.

A: Answer: Given that  the random sample of 100 people  n=100  r=74 The test statistics for population…

Q: During a flu vaccine shortage in the United States, less than a majority of people were able to…

A: Given data, n=2350 x=978 sample proportion p=xn=9782350=0.4162   z-value at 95% confidence is…

Q: The Indian River County Health Department needs to estimate the proportion of all children in the…

A: 1) It is given that n=116 and the sample proportion is 0.74.

Q: A restaurant would like to estimate the proportion of tips that exceed​ 18% of its dinner bills.…

A: The provided information is:

Q: A study conducted to examine the age of commercial jets in the United States sampled 36 planes and…

A: Given information- Sample size, n = 36 Sample mean, x-bar = 12.6 years Sample standard deviation, s…

Q: In a simple random sample of 38 bulbs, 25 gives a good glow, What is a 85% score Confidence interval…

A: Given data,n=38x=25sample proportion p=xn=2538=0.66z-value at 85% confidence is Zc=1.44

Q: In a survey of 20222022 adults in a recent​ year, 716716 made a New​ Year's resolution to eat…

A: It is given that, In a survey, the total number of participants (n) is 2022, in which 716 adults in…

Q: A recent Gallop poll showed that 672 of 1019 adults nationwide think that marijuana should be…

A:

Q: A radio producer measures the duration of 60 randomly selected songs played on the radio station's…

A: Given that, x¯=4.27,s=1.22,n=60 The degree of freedom is, df=n-1    =60-1    =59 Critical value:…

Q: A large multi-branch bank is affiliated with both the MasterCard and Visa credit cards. For a random…

A: A random sample of 100 master cards with sample mean 682.58 and standard deviation 307.05, another…

Q: A random sample of 50 helmets (to protect motorcyclists) was subjected to a crash test and 15…

A: Given : Sample Size, n = 50 Number of successes, x = 15 confidence level,c=0.95

Q: The EPA wants to test a randomly selected sample of nn water specimens and estimate the mean daily…

A: From the provided information, Population standard deviation (σ) = 4 Margin of error (E) = 1…

Q: A recent survey showed that from a sample of 500 packages delivered by a Postal Service, 480 were…

A:

Q: In a random sample of 100 automobile engine crankshaft bearings, 10 have a surface finish that is…

A: Givensample size(n)=100x=10p^=xn=10100p^=0.10confidence interval = 95%

Q: Similar to humans, it has been shown that dogs have a “handedness", preferring to use either a right…

A:

Q: in a survey of 2042 adults in a recent​ year, 715 made a New​ Year's resolution to eat healthier.…

A:

Q: A sample of 200 lightbulbs was tested and it was found that 11 were defective. Calculate a 95%…

A:

Q: In a random sample of 41criminals convicted of a certain​ crime, it was determined that the mean…

A:

Q: A random sample of 300 graduating high school seniors was polled across a particular tristate area,…

A:

Q: A plant that manufactures a special filament for incandescent lamps works two eight-hour shifts…

A: Given that, confidence level=0.90  Alpha=1-0.90=0.10 We use t test for given problem. Null…

Q: A local health center noted that in a sample of 400 patients, 80 were referred to them by the local…

A: From the provided information, Sample size (n) = 400 From which 80 were referred to them by the…

Q: A manufacturing plant manager defines production as out of control when the overall rate of defects…

A:

Q: A random sample of 460 ball bearings chosen at random from a very large consignment is found to have…

A:

Q: During a natural gas shortage, a gas company randomly sampled residential gas meters in order to…

A: Solution: Let X be the gas consumption. From the given information, x-bar=250 cubic feet, S=50 cubic…

Q: In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and…

A:

Q: According to a report on sleep deprivation by the Centers for Disease Control and Prevention, the…

A:

Q: In a study of academic procrastination, the authors of a paper reported that for a sample of 451…

A: Given Information: Sample size (n) = 451  Mean value (x) = 7.14 hours Standard Deviation (s) = 3.20…

Q: A company that produces white bread is concerned about the amount of sodium in its bread. The…

A:

Q: In a simple random sample of 1500 patients admitted to the hiospital with pneumonia, 145 were under…

A: Given DataN = 1500n = 145proportion is given by

Q: In crash tests of 28 Honda Odyssey minivans, collision repair costs are found to have a distribution…

A: Given, Sample size = 28 Sample mean = 2020 Sample standard deviation = 350   Since the population…

Q: An epidemiologist needs to estimate the proportion of residents of St. Lucie county that have been…

A:

Q: In a survey of 2135 adults in a recent​ year,748 made a New​ Year's resolution to eat healthier.…

A: From the provided information, Sample size (n) = 2135 748 made a New Year’s resolution to eat…

Q: A group of students sampled water from 34 lakes in St. Joseph County. If the mean dissolvedoxygen…

A: Given Information Number of goats = 34 Mean = 3.2 Standard deviation = 0.57 90% confidence interval…

Q: A paint manufacturer wants to determine the average drying time of a new interior wall paint. If for…

A: Given Information: Sample size (n) = 12 Sample mean (x¯) = 66.3 Sample standard deviation (s) = 8.4…

Q: In a study of the accuracy of fast food drive through orders, restaurant A had 207 accurate orders…

A:

Q: An article in the journal of bone and joint surgery suggested that approximately 8% of such…

A: The percentage of bone and joint surgery suggested in article is 8%, and the margin of error is 4%.…

Q: The Ball Corporation's beverage can manufacturing plant in Atkinson, Wisconsin, uses a metal…

A: From the provided information, Sample size (n) = 58 Sample mean (x̄) = 3.193 Population standard…

Q: in a study of 150 randomly selevted accidents that required treatment in and ER 36% involed children…

A:

Q: In a random sample of 250 students who enrolled in Science, 150 took notes during classes. Find an…

A: Given that n=250,x =150,alpha =0.05 Find an approximate 95% confidence interval for the population…

Q: At a certain Senior High School, a random sample of 10 students was taken and asked about their…

A: The question is about the confidence interval for a pop. mean Given : The sample size is n=10.…

Q: Traffic engineers compared rates of traffic collisions at intersections with raised medians and…

A: Given,n1 = 4512x1 = 2202n2 = 4277x2 = 1903p1¯ = x1n1 = 22024512 = 0.4891p2¯ = x2n2 = 19034277 =…

Q: In a preelection poll, a pollster finds that 442 out of 650 people polled favor Smith. Construct the…

A: We need to construct the 95% confidence interval for the population proportion. We have given the…

Q: A marketing study with a random sample of 400 results in 160 subjects reacting positively to the…

A:

Q: In a random sample of 85 automobile engine crankshaft bearings, 10 have a sur face finish that is…

A: Given, sample size n =85 x=10 Sample proportion = 0.12 Confidence level = 95% The critical value for…

Q: In a survey of 2024 adults in a recent​ year, 709 made a New​ Year's resolution to eat healthier.…

A:

Q: In a random sample of 38 criminals convicted of a certain​ crime, it was determined that the mean…

A: Given : n= 38.0 , x= 67.0 s= 11.0 At 95.0 % confidence level , z score= 1.96

Q: In order to investigate the relationship between mean job tenure in years among workers who have a…

A: For Bachelor’s degree or higher : n1 = 150 x1 =5.2s1 = 3.3   For No degree : n1 = 110 x1 =5.0s1 =…

Q: In a survey of 2033 adults in a recent​ year, 735 made a New​ Year's resolution to eat healthier.…

A: First find out the true population proportion .    Total number of adults in a survey = n= 2033…

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.