Consumer Reports rated airlines and found that 81% of the flights involved in the study arrived on time (i.e., within 15 minutes of scheduled arrival time). Assuming that the on-time arrival rate is representative of the entire commercial airline industry, consider a random sample of 186 flights. (Round your answers to two decimal places.) What is the expected number that will arrive on time? What is the standard deviation of this distribution?

Q: The 2010 census found that 13.9% of adults in the United States identifi ed themse Hispanic origin.…

A: Given data, n=1500 p=13.9%=0.139 Find mean and sd?

Q: Sixty percent (60%) of all computers sold by a large computer retailer are laptops. (The remaining…

A: From the provided information,60% of all computers sold by a large computer retailer are laptops…

Q: Consumer Reports rated airlines and found that 80% of the flights involved in the study arrived on…

A: Given information Probability of flights arriving on time (p) = 0.8 Number of flights (n) = 188

Q: In small-scale survey, you ask people how many times they have been abroad on holiday over the…

A: Given data set - 7, 0, 7, 7, 7, 0, 10, 8, 5, 4, 0, 0 n = 12

Q: A home furnishings store that sells bedroom furniture in conducting an end of month inventory of the…

A: The z-critical value for 99% confidence interval is calculated using the excel formula…

Q: Drinking the cereal milk? A USA Today poll asked a random sample of 1012 U.S. adults what they do…

A:

Q: whose puilding values per acre are given, are unusual (more than two standard deviations from the…

A: X 1493 2089 1232 801 1590 1545 The data value that is less than $1200 is $801 and greater…

Q: How smart is your phone? A random sample of 10 Samsung Galaxy smartphones being sold over the…

A: We have given that,  The data set is,  199, 169, 385, 329, 269, 149, 135, 249, 299, 249 standard…

Q: What is the standard deviation of the data (7, 1, 7, 10, 5, 3, 2}? O 2.7 O 3.0 5.0 O 9.0

A:

Q: A social scientist wants to estimate the average salary of office managers in a large city. She…

A: Solution: From the given information, confidence level is 0.95, σ=$1050 and E=$200.

Q: An ethanol railroad tariff is a fee charged for shipments of ethanol on public railroads. An…

A: The standard deviation is $900, and the sample size is 200.

Q: According to data from the 2010 United States Census, 71.6% of the total United States population…

A:

Q: Arandom sample of 12 second-year uniiversity students enrolled in a business statistics course was…

A: The t-test can be used when the sample size is small or less than 30.

Q: n variable.

A:

Q: Each year University Park estimates the standard deviation of the time it takes for the bus to…

A: The investigator is specially interested to test whether the variability in time has increased in…

Q: Business Weekly conducted a survey of graduates from several top MBA programs. On the basis of the…

A: Given data,Mean μ=136000sd σ=39000n=16

Q: compare the variance of the number of correct picks on a "take Five" ticket? compute the standard…

A:

Q: A physical fitness association is including the mile run in its secondary-school fitness test. The…

A: The mean is 440 seconds and the standard deviation is 60 seconds.

Q: Remembrance Day Ceremony this year. (a) Complete the statement below. Enter your answer using all…

A: Given Data population proportion,p = 0.2979 sample size n = 528

Q: A random sample of 8 adults aged 30years,were asked how much they spent of medication costsin the…

A: Given: Data in ascending order: 140,300,470,520,640,700,1200,5600 Sample Mean can be calculated as:…

Q: Watching TV The 2012 general Social Survey asked a large number of people how much time they spent…

A: Given

Q: The salary for workers at a company are normally distributed with a mean of $60,000 and a standard…

A:

Q: (b) Find the mean of your sample. The mean is 37.9. (Round to one decimal place as needed.) Find the…

A: Calculate MEAN,Sample Standard deviation (S) from the following…

Q: In a certain school district, the ages of all new teachers hired during the last 5 years are…

A: Z = x - μσ~ N(0,1)

Q: A standardized​ exam's scores are normally distributed. In a recent​ year, the mean test score was…

A: From the given information, the standardized exam’s scores are normally distributed with mean is…

Q: One aspect of the beauty of scenic landscape is its variability. The elevations (feet above sea…

A: We have given that,  The data set is,  901, 658, 577, 1360, 901, 1198, 820, 1090, 631, 658, 1306,…

Q: tuition for the current academic year is $60,000, but the university claims that the average grants…

A: Given data : sample size, n = 20 sample mean, x̄ = 25000.0 sample standard…

Q: The average income of a graduate from the University of Eastern West Virginia is $50,000 per year,…

A: X follows a Normal distribution with mean = 50000 and S.D = 2500 Then z=(x-mean)/SD =…

Q: Salaries for teachers in a particular elementary school district are normally distributed with a…

A:

Q: Salaries for teachers in a particular elementary school district are normally distributed with a…

A: Given information- Population mean, μ = $41,000 Population standard deviation, σ = $6,200 Sample…

Q: An ethanol railroad tariff is a fee charged for shipments of ethanol on public railroads. An…

A: The standard deviation is 1,350.

Q: grocery store has taken a random sample of 100 customers The average length of time it took the…

A: Mean = 4.2Standard deviation = 0.6Sample size = 100

Q: "he mean value of land and buildings per acre from a sample of farms is $1400, with a standard…

A:

Q: An insurance company is looking over accident statistics. They want to model the population of all…

A: Obtain the population standard deviation:

Q: y element to successful online retailing. According to a marketing survey, 30% of online customers…

A: According to the sum, Online customer service is a key element to successful online retailing.…

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.