Unoccupied seats on flights cause airlines to lose revenue. Suppose a large airline wants to estimate its avera number of unoccupied seats per flight over the past year. To accomplish this, the records of 250 flights are randomly selected and the number of unoccupied seats is noted for each of the sampled flights. The sample m is 11.3 seats and the sample standard deviation is 4.5 seats. Construct a 92% confidence interval for the population mean number of unoccupied seats per flight. State the confidence interval. (Round your answers to two decimal places.) а. b. Calculate the error bound. (Round your answer to two decimal places.)

Q: A researcher wants to test the claim that convicted burglars spend an average of 18.7 months in…

A: Null hypothesis: µ=18.7. Alternative hypothesis: µ≠18.7. This is a two-tailed test. Here, the sample…

Q: In question 2 a 90% confidence interval was computed based on a sample of 250 adults. If the level…

A:

Q: From a random sample of 49 high school seniors, the sample mean and standard deviation of the math…

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Q: A local firm in Quiapo Manila manufactures LED products that have a lifespan that is approximately…

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Q: In a transportation study of 27 large cities it was found that the number of motor vehicles per…

A: Given : Sample size (n) = 27 Sample mean (X¯) = one.34 i.e 1.34 Sample SD (S) = 0.46 Confidence…

Q: In a random sample of 23 private school teachers in queens county the average teaching experience is…

A:

Q: Question 4 Some concepts are very important when forecast a data series. Explain the relationship…

A: Time series forecasting is the use of model to predict future values based on previously observed…

Q: A technician randomly sampled repair logs for computers at a university. He wanted to find out how…

A: It is given that the proportion of computers that were repaired more than three times in the last…

Q: In a random sample of 36 criminals convicted of a certain​ crime, it was determined that the mean…

A: Sample size (n) = 36 Mean x̅ = 69 Standard deviation (s) = 11 Significance level(α) = 1 - 0.90 =…

Q: The housing market has recovered slowly from the economic crisis of 2008.​ Recently, in one large​…

A: n=42, sample mean x̄=9160, s=1631

Q: A random sample of 40 home theater systems has a mean price of $500 and a standard deviation of $60.…

A: Construct the 99% confidence interval for the population mean The 99% confidence interval for the…

Q: In a recent year, a sample of the South American Redeye Piranha was collected by fishermen on a…

A: We have to interprete data.

Q: The deflection temperature (°F) of two types of plastic pipe under a specified load is investigated…

A: We have given that,  The data set are : Type 1: 206, 188, 205, 187, 194, 193, 207, 185, 189, 213,…

Q: The housing market recovered slowly from the crisis of 2008. Realtors in one community have recently…

A: The housing market recovered slowly from the crisis of 2008. Realtors in one community have recently…

Q: During the nutrition research, the amount of consumed kilocalories per day was measured for 18…

A: For Women     The 90% confidence interval for women is (1753,1951) .

Q: For questions 1-11, use the Math_achievement.sav file. As part of a large national education study,…

A: In this case, we need to check whether there is a significant difference between genders in…

Q: Find a 95% confidence interval for the difference between full attendance students' Exam 5 score and…

A: We have given data,  Less attendance Full attendance 90 96 90 96 60 100 50 99 69   88…

Q: a simlpe random sample of 8 college freshmen were asked how many hours of sleep they typically got…

A: Box plot can be used to find the outlier. Box plot: Software procedure to draw box-whisker plot…

Q: The personnel director of a large corporation wishes to study absenteeism among clerical workers at…

A:

Q: Eleven people were given 46 grams (1.6 ounces) of dark chocolate every day for two weeks, and their…

A: The given values are:Sample size (n) = 11Sample mean (x̄) = 1.30Sample standard deviation (s) =…

Q: During the nutrition research, the amount of consumed kilocalories per day was measured for 18…

A:

Q: For a new study conducted by a fitness magazine, 250 females were randomly selected. For each, the…

A: Computation of critical value: 1-α=0.95α=0.05α2=0.0251-α2=0.975 The critical value of z-distribution…

Q: A food snack manufacturer samples 11 bags of pretzels off the assembly line and weighs their…

A:

Q: A marketing research company wants to determine if there is a difference in the mean satisfaction…

A: Given information  n1=n2=100, sample mean x̄1=4.6, sample mean x̄2=4.5, standard deviation s1=s2=0.8…

Q: Brown treesnakes are an invasive species causing huge environmental and financial damage in Guam.…

A: n=504, SE=3, sample mean=121

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 monthly advertising expenditure of the company is normally distributed with a standard deviation…

A:

Q: The International Air Transport Association surveys business travelers to develop quality ratings…

A: Givensample size(n)=50Mean(x)=3.34standard deviation(s)=2.163confidence interval = 95%

Q: For a new study conducted by a fitness magazine, 255 females were randomly selected. For each, the…

A: Given a study conducted by a fitness magazine, 255 females were randomly selected. For each, the…

Q: For a new study conducted by a fitness magazine, 270 females were randomly selected. For each, the…

A: using excel we find critical value

Q: The lead levels in a random sample of 23 crows in the region were measured and recorded. The mean…

A:

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

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Q: The personnel manager of a large corporation wishes to study absenteeism among clerical workers at…

A:

Q: company manufactures a certain over-the-counter drug. The company samples 80 pills and finds that…

A: We have given that  Sample size n = 80 Sample mean = 325.5 Standard deviation s=10.3 90%confidence…

Q: The pH of rain, measured at a weather station in Michigan, was observed for 39 consecutive rain…

A:

Q: A simple random sample of 5 recently hospitalized migraine sufferers were given a new treatment; the…

A: The degrees of freedom is obtained as follows: Df=n-1    =5-1     =4 The critical-value is obtained…

Q: To decide what personnel requirements should be enforced, a hospital manager wants to estimate the…

A:

Q: For a new study conducted by a fitness magazine, 280 females were randomly selected. For each, the…

A: Here the two samples are independent. Let the first population(i.e, daily calorie consumption of…

Q: A professor at a local community college is interested in studying the amount of hours that a…

A: See the handwritten solution

Q: Researchers from a certain country were interested in how characteristics of the spleen of residents…

A: That is, there is no evidence to conclude that there is a difference exists in the mean spleen…

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.