A national air traffic control system handled an average of 47,189 flights during 29 randomly selected days in a recent year. The standard deviation for this sample is 6,351 flights per day. what is the 99% confidence interval ?

Q: You measure 41 watermelons' weights, and find they have a mean weight of 47 ounces. Assume the…

A: Given that: n= 41.0 , x̄= 47.0 s= 2.5 At 90.0 % confidence level , z score= 1.645 So, 90.0 %…

Q: 4. According to a recent poll of eight social networking sites, the averagemonthly visitor counnt…

A: In question, Given that in a poll of 8 networking sites the average monthly visitor count was 12.1…

Q: You randomly select 20 cars of the same model that were sold at a car dealership and determine the…

A: Answer:- Given, Sample size, n = 20  Sample mean, X¯= 9.75  Sample standard deviation, S = 2.39…

Q: A sample of 56 Charleston County households have a mean income of $27,519 with a standard deviation…

A:

Q: A car repair business randomly selects receipts for parts purchased on 16 different jobs. The mean…

A: given data, n=16x¯=31.32s=30.42CI=0.95α=1-0.95=0.05df=n-1=16-1=15we  have to construct the 95%…

Q: Adult Great Basin rattlesnakes have a mean length of 33.6 inches and a standard deviation of 4.8…

A: GivenFor Adult Great Basin rattlesnakesMean(μ)=33.6standard deviation(σ)=4.8sample size(n)=36For…

Q: If a school district takes a random sample of 63 Math SAT scores and finds that the average is 488,…

A: Given information Sample size (n) = 63 Sample mean x̅ = 488 Population standard deviation σ = 100…

Q: 5. A researcher surveyed of 300 young adults ages 18-29 found that on average, those surveyed sent…

A: 5. Given that, n=300x¯=67.7s=23.6 Confidence level=90% Significance level=1-0.90-0.10…

Q: You want to purchase a used car. The mean monthly payment for a random sample of 12 cars advertised…

A: Given: n=12x¯=275σ=35 Confidence level = 95%

Q: A sample of 47 Charleston County households have a mean income of $32,346 with a standard deviation…

A: The sample size is 47, sample mean is $32346, and sample standard deviation is $8571. The confidence…

Q: A consumer organization inspecting new cars found that many had appearance defects​ (dents,…

A: For the given data  Find the expected number of appearance defects in a new car and the standard…

Q: 2. A random sample of 85 group leaders, supervisors, and similar personal revealed that a person…

A: Introduction: The approach to determining the population distribution average is by utilizing a…

Q: If the mean of a random variable is 30 and the standard deviation is 6, and three consecutive data…

A: It is given that, Mean,μ=30 Standard deviation,σ=6

Q: If a school district takes a random sample of 75 Math SAT scores and finds that the average is 433,…

A:

Q: According to the American Medical Association, the average annual of radiologists in the USA are…

A:

Q: In a survey, 45 people were asked how much they spent on their last partners birthday gift. The…

A: Given information- Sample size, n = 45 Significance level, α = 0.10 Sample mean, x-bar = $90 Sample…

Q: In 1999, the murder rates (per 100,000) for the 50 states and the District of Columbia had a mean of…

A:

Q: he average weight of 20 randomly selected cars was 3500 pounds. The sample standard deviation was…

A: given data, n=20df=n-1=20-1=19x¯=3500 pounds s=315 pounds CI=0.90α=1-0.90=0.10

Q: A college admissions officer takes a simple random sample of 96 entering freshmen and computes their…

A: We have to find out lower confidence interval...

Q: We weigh forty neonates and obtain a sample mean of 10 pounds with a standard deviation of 2 pounds.…

A: First, we find the critical value for 99% confidence interval.

Q: A musicologist is currently writing a report about pop songs in the late 2010s. As a part of her…

A: Givensample size(n)=222Mean(x)=3.05standard deviation(σ)=0.3

Q: If a school district takes a random sample of 80 Math SAT scores and finds that the average is 497,…

A:

Q: If a school district takes a random sample of 89 Math SAT scores and finds that the average is 497,…

A: From the provided information, Sample size (n) = 89 Sample mean (x̅) = 497 Population standard…

Q: If the mean and standard deviation of a sample of size 45 is 1050 and 52 respectively, construct a…

A: It is given that Sample mean = 1050Sample standard deviation = 52Sample size = 45Confidence level =…

Q: A study of 64 bolts of carpet showed that their average length was 75 yards. The standard deviation…

A:

Q: A student read that a 95% confidence interval for the mean age an American first drinks alcohol is…

A: Lower limit = 16 - 1.2 =14.8 Lower limit = 16 + 1.2 =17.2

Q: igh school soccer league there are a total of 256 players.

A: Given that Total players in high school soccer league (n) = 256 players The mean height of the…

Q: A pollster asked a random sample of 269 students about their savings. The average amount of money…

A: The sample size is 269, sample mean is $258, and sample standard deviation is $145. The degrees of…

Q: A large number of chain saws have been sold. You contact 250 customers and find that it takes an…

A: The following information is provided: Sample Mean \bar XXˉ = 4242 Sample Standard Deviation…

Q: You measure 41 watermelons' weights, and find they have a mean weight of 79 ounces. Assume the…

A: Mean = 79Standard deviation = 2.4Sample size = 41

Q: I asked 45 randomly selected WSU college students how many US states they had visited. The students'…

A: The sample size is 45, sample mean is 3.8 and standard deviation is 1.5. The degrees of freedom is,…

Q: The lead levels in a random sample of 35 crows in the region were measured and recorded. The mean…

A: It is given that  Sample size n = 35 Sample mean M = 4.50 Sample SD s = 1.12 Confidence level = 99%…

Q: If a school district takes a random sample of 89 Math SAT scores and finds that the average is 494,…

A:

Q: 26 randomly selected students took the calculas final. If the sample mean was 90. Construct a 95$…

A:

Q: Do female college students spend more time than male college students watching TV? This was one of…

A: Let μMales be the mean time spent watching TV per day by males and μFemales be the mean time spent…

Q: A popular weight loss program claims users will lose weight each month. Linda samples 25 dieters and…

A: We have given that,  Sample mean (x̄) = 10 pounds, standard deviation (s) = 2 pounds and sample size…

Q: The time patients wait for examination in a hospital fits the normal distribution and the population…

A:

Q: A credit counseling agency wants to estimate the mean amount of credit card debt held by Americans.…

A: Here we need to construct a 90% confidence interval for the population mean.

Q: Adult Great Basin rattlesnakes have a mean length of 32.5 inches and a standard deviation of 6.6…

A:

Q: If only the upper 30% of a normally distributed class passed a quiz for which the mean was 70 and…

A: According to the given information in this question we need to find the lowest score a student could…

Q: One hundred and twenty Americans were surveyed about how much time per month they spend watching…

A: From the provided information, Sample size (n) = 120 Sample mean (x̅) = 140 hours Sample standard…

Q: In a study of woman's bone health, a random sample of 8 women was taken, and their daily calcium…

A: