A real estate sales agency, specializes in selling farm houses. Its records indicate that the mean selling time of farm property is 90 days. Because of recent economic conditions, the agency believes that the mean selling time is now greater than 90 days. A statewide survey of 100 recently sold farms revealed a mean selling time of 93 days, with a standard deviation of 20 days. At the .05 significance level, has there been an increase in selling time?

Q: Students at Lake Mean PE class ran a 5K with a mean run time of 31 minutes and a standard deviation…

A: Given that Mean = 31 standard deviation = 4  We need to find probability between 23 and 27…

Q: na certain city, the average 20- to 29-year old man is 69.4 inches tall, with a standard deviation…

A: Given data,For Man:μ=69.4σ=3.2Age X=75For Woan:μ=64.5σ=3.8Age X=70

Q: A company make LED light bulbs and claims that they have a life of 20,000 hours. A sample of 16bulbs…

A: From the given information, Sample size (n) = 16 Sample mean (x-bar) =19706 Standard deviation (s) =…

Q: A research article claims that the mean cost of raising a child from birth to age 2 in a rural area…

A: Given : population mean, u = 10460

Q: A sample of 23 provided a sample mean of 158 and a sample standard deviation of 20. Find the value…

A: Given that Sample size n = 23 Sample mean = 158 Sample SD = 20

Q: 1. Weekly demand for smartphones at an Apple store is nor- mally distributed, with a mean of 500 and…

A: Given ROP=350 Formula for the ROP is given by ROP=Demand during lead time+safety stock Hence, Safety…

Q: A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive…

A: Given information: The investigator is specially interested to test whether the mean tenure for a…

Q: In a certain city, the average 20- to 29-year old man is 69.8 inches tall, with a standard deviation…

A:

Q: According to a dietary study, high sodium intake may be related to ulcers, stomach cancer, and…

A:

Q: "According to Dietary Goals for the US (1977), high sodium intake may be related to ulcers, stomach…

A: The given information is  Population mean : 220 milligramssample mean:x¯=210 milligramssample…

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

A: Use excel formula "=NORM.S.DIST(1.976, TRUE)" to find the probability.

Q: Subjects in a study by Dabonneville et al. (A-9) included a sample of 40 men who claimed to engage…

A: From the provided information, The hypotheses can be constructed as: H0: µ1 = µ2 H1: µ1 < µ2…

Q: A research article claims that the mean cost of raising a child from birth to age 2 in a rural area…

A: Given : population mean is $10460

Q: The average pre-school cost for tuition fees last year was P17,250. The following year, 20…

A: Given that  Population mean = 17250 Sample mean = 16150 Sample size (n) = 20  Alpha = 0.10. By using…

Q: Unprotected sex with a partner who is infected with HSV-2 (genital herpes) and who is currently…

A:

Q: In a certain city, the average 20- to 29-year old man is 72.5 inches tall, with a standard deviation…

A: From the provided information, The height of men is normally distributed with mean (µ) = 72.5 inches…

Q: In a certain supermarket, a sample of 60 customers who used a self-service checkout lane averaged…

A: Introduction: Assume that the checkout times of the customers are independent of each other, between…

Q: Assume the salaries of elementary school teachers in the US are normally distributed with a mean of…

A: We bave to find given probability.

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

A:

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: Suppose a real estate agent is interested in comparing the asking prices of condos in Montreal and…

A: The confidence interval is the interval range that helps to understand whether the test is…

Q: The advertising budgets of small stores in Los Angeles is normally distributed with a mean of $5,400…

A: It is given that mean and standard deviation are $5,400 and $2,100, respectively.Let the variable X…

Q: 3. the Educational Testing Service in Princeton, New ler sey (which administers SAT exam) re- In…

A: In this question, we have given that probability that a student selected randomly will score between…

Q: The Royal Bank of Canada net income averaged $60 million per year with a standard deviation of $15…

A: If n<30 and population standard deviations are unknown then t-test is used. Here  n=9 Standard…

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: A random sample of 75 medical doctors in Detroit showed that they worked an average of 55.1…

A: Conditions for Two sample Independent t test: The two samples are independent to each…

Q: a florist ahs a floral shop  in miami  and anotherin san diego. Teh miami shop has a mean daily…

A: We need to compute the z-score to find out which store had the better sales.

Q: years. A survey of companies reported in The Wall Street Journal found a sample mean tenure of x =…

A: (a)   The following null and alternative hypotheses need to be tested: Ho: \muμ ≥ 99 Ha: \muμ <…

Q: A pipes manufacturer makes pipes with a length that is supposed to be 10 inches. A quality control…

A: The sample size is 39, sample mean is 10.05, sample standard deviation is 0.28. It is clear that the…

Q: Select all that apply:   Reject the null hypothesis.   Fail to reject the null…

A: Explanation:The decision rule regarding the testing of hypothesis for a left-tailed alternative…

Q: that empty homes are not as appealing to buyers as staged homes and, therefore, sell for lower…

A: The following information has been provided: Sample Mean 1 (\bar X_1)(Xˉ1​) = 150000150000…

Q: In a certain city, the average 20- to 29-year old man is 69.4 inches tall, with a standard deviation…

A: Solution-: Given: For Man: For Women: We find who is relatively taller, a 75 inch man or 70 inch…

Q: Suppose a locally owned coffee shop had an average daily revenue of $4,191 before some ordinance was…

A: Given Data: x¯=3922s=750n=30   Null and Alternate Hypothesis: H0: μ=4191 H1: μ≠4191

Q: A trucking company determined that the distance traveled per truck per year is normally distributed,…

A: A normal distribution is a continuous type probability distribution.It is also known as a…

Q: A 7,000-seat theater is interested in determining whether there is a difference in attendance…

A:

Q: Suppose the average height of a two year old male is normally distributed with a mean of 34.2 inches…

A: Given, Mean = μ = 34.2standard deviation = σ = 2.9

Q: Businesses such as General Mills, Kellogg's, and Betty Crocker regularly use coupons to build brand…

A: Note - As per our BNED policy, we are allowed to answer only three sub parts at a time. So, kindly…

Q: A firm’s marketing manager believes that total sales for next year will follow the normal…

A: Given information- Population mean, µ = $3200,000 Population standard deviation, σ = $250,000 We…

Q: An article reported that for a sample of 45 kitchens with gas cooking appliances monitored during a…

A: Confidence Interval - In interval estimation, confidence interval gives amount of error that can be…

Q: It has been reported that the average credit card debt for college seniors at the college  book…

A: Given Information :  It has been reported that the average credit card debt for college seniors at…

Q: 1. A particular brand of tires claims that its deluxe tire averages at least 55,000 miles before it…

A: Given : n(sample size)=45 Alpha(level of sig.)=0.05

Q: Consider the time it takes, in minutes, for police officers to respond to a 911 call, where a…

A:

Q: In a class of twenty-five 15-year old girls the average height is M = 62.60 inches. The national…

A: Given that M =62.60,μ=63.80,σ=2.66,n=25 (2) The value of effect size Cohen’s d is, Thus, the value…

Q: Subjects in a study by Dabonneville et al. (A-9) included a sample of 40 men who claimed to engage…

A:

Q: The heights of German men are normally distributed with a mean of 67.9 inches and a standard…

A: a) Empirical rule: The probability of the observation lies within 1 standard deviation of the mean,…

Q: The Downtown Parking Authority of Tampa, Florida, reported the following information for a sample of…

A: We are given a table.

Q: A new formulation of fast disintegrating tablets was designed to have mean dissolution time longer…

A: In case of A, the standard deviation is known to us so we can carry out a simple z-test to test the…

Q: A new formulation of fast disintegrating tablets was designed to have mean dissolution time longer…

A: The hypothesis test is a statistical method in which one using the sample data try to check the…

Q: What is the standart-deviation of the following data? (select the closest value) Class Frequency 2.7…

A: The table that shows the calculations is shown below: The sample mean is calculated as follows:

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.