9. A journal article reported that the mean hospital stay following a particular surgical procedure in 2001 was 7.1 days. A researcher feels that the mean hospital stay in 2002 should be less due to initiatives aimed at reducing health care costs. A random sample of 40 patients undergoing the same surgical procedure in 2002 had a mean length of stay of 6.85 days with a standard deviation of 7.01 days. Run the appropriate statistical test at a = 0.05.

Q: 4. Consider that in a population of Filipino adults ages 18 to 65, Body Mass Index (BMI) is normally…

A: Given: X~N(μ,σ)μ=28σ=6

Q: 4. Suppose that in the past years the average price per square foot for warehouses in Subic has been…

A: One sample t-test: The one -sample t -test is used to determine whether the mean of sample differs…

Q: 3. Suppose the mean blood glucose of a population of adults is 162 with a standard deviation σ=58.…

A: Given that, n=36,μ=162σ=58 The mean and standard deviation of sample mean is,

Q: 1. The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A…

A:

Q: An entrance examination is to be conducted to 1600 ncoming freshmen students at Gordon college which…

A: Let X be the variable denoting score of the exmination. X ~ N (μ, σ) Given mean, μ = 85 standard…

Q: 1. The mean serum level measured in 12 patients twenty-four hours after they received a newly…

A: Hypothesized Population Mean (µ) = 1 mg/dl The provided sample mean is = 1.2 mg/dl Sample standard…

Q: What is the degree of freedom between groups? What is the degree of freedom within groups? What is…

A: The provided information is There are 10 families in Makati and 12 families in Quezon. a=10, s=12…

Q: 3. A line up for tickets to a local concert had an average (mean) waiting time of 20 minutes with a…

A: Formula : Z =(X - μ)/σ

Q: In a study of employee stock ownership plans, satisfaction by employees is measured and found to be…

A: Given,mean(μ)=4.89standard deviation(σ)=0.63sample size(n)=450

Q: 31.The National Center for Health Statistics reports that the mean systolic blood pressure for males…

A: As the population standard deviation is not known, we will use the z test. As it is required to test…

Q: What value lies under a standard score of 1.5 in a distribution having a mean of 55 and standard…

A:

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.11 and a…

A: Given that the shoe sizes of American women have a bell-shaped distribution with a mean of 8.11 and…

Q: Suppose, according to a 1990 demographic report, the average U. S. household spends $90 per day.…

A:

Q: 10. A measure of the right atrial pressure (mm Hg) was made for cardiac patients who were given…

A: The appropriate test statistic to conclude the indifference between the mean right atrial pressure…

Q: Suppose a random sample of 25 measurements was taken from a population with a mean of 74 and a…

A: We know that,  Sample size (n) = 25 and population mean (μ) = 74 and population standard deviation…

Q: 24. Suppose annual salaries for sales associates at Target have a mean of $32,500 and a standard…

A: According to the provided information, Mean (μ) =$32500 Standard Deviation (σ) = $2500

Q: A dean at BUC claims that the average age of the students in this college is 25. A random sample of…

A: Note: Thank you for the question. Since it is not mentioned the standard deviation is population…

Q: A company claims that the time their customers spend waiting in line for service is normally…

A: Given that  The company claims that the time their customers spend waiting in line for service…

Q: r feels that the mean hospital stay in 2002 should be less due to initiatives aimed at reducing…

A: We are given: μ=Population mean=7.1x¯=Sample mean=6.85s=Sample standard devitaion=7.01n=Sample…

Q: 3) A job placement director claims that the average starting salary for nurse is $25000. A sample of…

A:

Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 67…

A: From the provided information, Mean (µ) = 67 Standard deviation (σ) = 6 Let X be a random variable…

Q: director

A:

Q: 4. Assume that the test scores from a college admission test are normally distributed with a mean of…

A: Given  μ= Mean of test score from a college admission test = 450 σ= Standard deviation of test score…

Q: ) H0: ?1 − ?2 = 0 Ha: ?1 − ?2 > 0     t=_________ P-value_______   State the conclusion in the…

A:

Q: The town of KnowWearSpatial, U.S.A. operates a rubbish waste disposal facility that is overloaded if…

A: Solution: Let X be the weight. From the given information, X follows normal distribution with mean…

Q: Suppose that employees at a large company have salaries that are normally distributed, with a mean…

A: We have given that, Let X be a random variable i.e. salaries of employees are normally distributed…

Q: a.     What statistical test will you use to test this data ?   b.     State the null and…

A: From provided information it is claimed that, women’s movement has resulted in an increase in the…

Q: Is there any systematic tendency for part-time college faculty to hold their students to different…

A: Given, We assume 1 as fulltime faculty; We assume 2 as part timers; Significance level,

Q: Suppose that the mean retail price per gallon of regular grade gasoline in the United States is…

A: Given,mean(μ)=$3.41Standard deviation(σ)=$0.10

Q: Suppose the scores of students on an exam are normally distributed with a mean of 253 and a standard…

A: From the provided information, Mean (µ) = 253 Standard deviation (σ) = 80

Q: 3. The U.S. Department of Agriculture claims that the mean consumption of bottled water by a person…

A: Claim : the mean consumption of bottled water by a person in the United States is 28.5 gallons per…

Q: The 2019 General Social Survey asked a number of teenagers from different countries how much time…

A: To check if there is a larger variety of TV watching times for teenagers in the United States is…

Q: 2. A scrap metal dealer claims that the mean of his cash sales is "no more than $80," but an…

A: Given that: Population mean(u) = $ 80 Sample mean = $ 91 SAMPLE standard deviation = $21 Sample size…

Q: 2. If the heights of a male youngsters are normally distributed with a mean of 60 inches and a…

A:

Q: 2. A university dean wishes to estimate the average number of hours his part-time instructors teach…

A:

Q: Suppose Stock A has had a mean price of $6.58 per share with a standard deviation of $1.88, and…

A: GivenFor stock A:-Mean(μ)=6.58standard deviation(σ)=1.88For Stock B:-Mean(μ)=10.57standard…

Q: 1. There are 95% of students at school weigh between 62 kg and 90 kg at Westchester Community…

A: 95% of the data lies between X¯-1.96×σ and X¯+1.96×σ hence we get, X¯-1.96×σ = 62 X¯+1.96×σ = 90…

Q: # 6- A set of data items is normally distributed with a mean of 90 and a standard deviation of 5.…

A:

Q: 2) A job placement director claims that the average starting salary for nurse is $26000. A sample of…

A:

Q: Is there any systematic tendency for part-time college faculty to hold their students to different…

A: Given : n1=125  x1=2.7386  S1=0.63342 n2=88 x2=2.8639 S2=0.50241 We have to calculate t stastics and…

Q: For a population with a mean of μ = 55 and a standard deviation of σ = 23, what is the standard…

A: Given : a population with a mean of μ = 55 and a standard deviation of σ = 23   We need to calculate…

Q: Suppose the number of Covax and Pfizer vaccine bought by the Philippine government are normally…

A: Let, X=the number of vaccine μ =mean σ = sd

Q: 3- At a computer manufacturing company, the actual size of a particular type of computer chips is…

A: We have to find required sample mean.

Q: 2) The time it take Claudia to drive to work is normally distributed with a mean of 46 minutes and a…

A: The time it take Claudia to drive to work is normally distributed with a mean 46 and standard…

Q: 4. A line for tickets to a local concert had an average (mean) waiting time of 20 minutes with a…

A:

Q: 4. A normally distributed set of 1,010 values has a mean of 103 and a standard deviation of 12.…

A:

Q: 2.) A ski gondola in Vail, Colorado that carries skiers up a mountain bears a plaque stating that…

A: n=12, maximum weight = 2004 mean = 188.6  std.dev = 38.9

Q: In a distribution with a mean of 80 and a standard deviation of 8, what percentage of number would…

A: a. The mean is 80, and standard deviation is 8. The percentage of number would be less than 64 or…

Q: 1.) It is claimed that the average performance of newly graduated nurses from the recent board exam…

A: Since you have asked multiple question, we will solve the first question for you. If youwant any…