In a spot speed study, a group of 3'd class civil engineering students has decided measure the average spot speed of a sample of 95 vehicles. If d = + 2, o = + 8, and .(90% confidence level) is 1.64. Check whether the sample is statistically adequat Adequate .a Not adequate b

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

A: Given that the confidence interval = 95% = 0.95 So the significance level= α = 1-0.95= 0.05 α/2=…

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

A:

Q: A 95% confidence interval computed from a sample of size 50 will have a greater margin of error than…

A: A 95% confidence interval computed from a sample of size 50 will have a greater margin of error than…

Q: In a study of the accuracy of fast food​ drive-through orders, Restaurant A had 241 accurate orders…

A: The formula for the 95% confidence interval for the proportion is given below:

Q: A total of 300 observations of Bob Ramos, an assembly-line worker, were made over a 40-hour…

A: Given: Sample size, S = 300 Sample size where Bob was found to be working = 250

Q: How many subject would be needed to ensure that a 95% confidence interval estimate of BMI had a…

A:

Q: If n=510 and ˆpp^ (p-hat) =0.19, find the margin of error at a 90% confidence level Give your…

A:

Q: In a survey of 2000 adults in a recent​ year, 708 made a New​ Year's resolution to eat healthier.…

A: Confidence interval for population proportion is given by, p^ +- z* √(pq/n) At 90% z = 1.645 At 95%…

Q: If n=520 and p (p-hat) =0.47, find the margin of error at a 90% confidence level Give your answer to…

A: Given data,n=520p=0.47z-value at 90% confidence is Zc=1.645Margin of error(E)=?

Q: A researcher surveys 50 individuals in Smithville and 40 in Amherst, finding that 30% of smithville…

A: Given: Smithville is taken as the first group. Amherst is taken as the second group.…

Q: a. A vaccination exercise carried out using a drive through service finds that 38 out of 62 vehicles…

A:

Q: Star and Tribune newspaper, there is an article entitled “1 in 8 school buses fail tests.”   The…

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

Q: Generate a 95% confidence interval estimate of the true BMI

A: The descriptive analysis is conducted using EXCEL. The software procedure is given below: Enter the…

Q: If n=320 and (p-hat) =0.94, find the margin of error at a 95% confidence level Give your answer to…

A:

Q: If n=300 and ˆpp^ (p-hat) =0.52, find the margin of error at a 90% confidence level Give your…

A: Suppose p is the true proportion.

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

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

A:

Q: A survey of 52 students in grades 4 through 12 found 65% have classroom Wi-Fi access. Find the 90%…

A: We have given that,  Sample size (n) = 52 and sample proportion (p̂) = 65% = 0.65  Then,  We will…

Q: In a sample of 40 water specimens taken from a construction site 26 contained detectable level of…

A: Obtain the 99.9% confidence interval for the population of water specimens that contain detectable…

Q: In a study of contamination at landfills containing construction and demolition waste, 42 leachate…

A: Solution:   The samples came from the same sample, they are not independent. It is not appropriate…

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: In a random sample of visitors to a famous touristattraction, 84 of 250 men and 156 of 250 women…

A: Calculate the sample proportion of men who bought souvenirs.  Similarly, calculate the sample…

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

A:

Q: The Okeechobee County Economic Development Board needs to estimate the proportion of all county…

A: It is given that 10.5% of the county residents in each sample have earned at least a bachelor's…

Q: A manufacturer interested in estimating the fraction of defectivE units produced. A random sample of…

A: The answer is given using the formula of the confidence interval.

Q: A random sample of 35 lumbar supports used by motorcycle riders and automobile race-car drivers were…

A: Given that to test the proportion of damaged helmet, the random sample of 35 lumbar is taken.

Q: From July 5-7, 2017, the Gallup Organization asked a random sample of 1,021 adults– aged 18 and…

A: From the information,  The sample proportion is, p^=59% The margin of error is, E=±4% The formula…

Q: 5, Randomly selected middle-aged people in both China and the United States were asked if they…

A: For China, n =1300 and x = 1170 therefore p^1 =11701300 = 0.9 For USA,  n = 150 and x =110 p^2…

Q: In a random sample of 1500 BA major students who are graduating from the University of Western Cape…

A: It is given that the random sample of 1500 BA major students are graduating from the University of…

Q: Rashid carried out pyrolysis of sawdust in a semi-batch reactor and obtained replicates of…

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Q: studying an anomaly in chick embryos, 50 fertilized eggs were injected with a treatment on the…

A: Given Data Sample Size, n = 50 Number of successes, x = 50-12=  38.0 Significance…

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: 1. A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo.…

A: Given, Participants are randomly assigned to receive the new treatment or a placebo and the outcome…

Q: A random sample of 138 first years, 80 indicated that they would use the school's library more if…

A: We have given that,  X1 = 80, N1 = 138 and X2 = 73, N2 = 96 Then,  We will find the 95% confidence…

Q: Rachel has attempted to standardize a solution and she obtained these replicate concentrations:…

A: Given: 0.1067, 0.1071, 0.1066, 0.1050

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

A:

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

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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: If n=200 and ˆpp^ (p-hat) =0.16, find the margin of error at a 95% confidence level Give your…

A: Given Information

Q: If n=18, (x-bar)%3D43, and S3D7, construct a confidence interval at a 80% confidence level. Assume…

A: we have given that  sample size (n)=18  ,xbar=43 ,standard deviation (s)=7

Q: a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 5000…

A: Bootstrap confidence interval     The bootstrap is a method for estimating standard errors and…

Q: A study of 420 comma 026   cell phone users found that 140   of them developed cancer of the brain…

A: Find z-critical value:

Q: In a survey of 2569 adults in a recent​ year, 1303 say they have made a New​ Year's resolution.…

A: Given data  n= 2569 X = 1303

Q: In a study designed to determine whether there was a cluster of brain cancer cases at a Pratt &…

A: The formula for the 95% confidence interval for the proportion is It is given that record from…

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

A: Given that  p^1=7.8%=0.078p^2=8.7%=0.087n1=11937n2=4892p^=n1p^1+n2p^2n1+n2=0.0806 Confidence…

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…

Q: In a trial of 275 patients who received 10-mg doses of a drug daily, 44 reported headache as a side…

A: The known values are, The sample proportion is,

Q: In the Star and Tribune newspaper, there is an article entitled "1 in 8 school buses fail tests."…

A:

Q: One method for measuring air pollution is to measure the concentration of carbon monoxide, or CO, in…

A: The margin of error for population mean is positively related to the confidence level and negatively…

Q: 1. A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo.…

A: Test for p1=p2 We want to test whether hypothesis: H0 : p1-p2 = 0 (Null hypothesis) H1: p1-p2 ≠ 0…