A real estate agent believes that the average closing cost of purchasing a new home is $6500 over the purchase price. She selects 40 new home sales at random and finds that the average closing costs are $6600. The standard deviation of the population is $120. Test her belief at a=0.05. Choices: Reject the null hypothesis. Do not reject the null hypothesis.

Q: A random sample of 26 local sociology graduates scored an average of 458 on the GRE advanced…

A: The mean difference between the mean of sample and that of population using the t-test. For the…

Q: On a standard measure of hearing ability, the mean is 300 and the standard deviation is 20. Give the…

A: Given data ,Mean u=300S.D σ=20

Q: The average credit card debt for college seniors is $3000. If the debt is normally distibuted with a…

A: A) The senior owes at least $1200

Q: Students at a major university are complaining of a serious housing crunch. Many of the university…

A: Given the mean distance commuted to school by students is 16.0 miles, and the standard deviation of…

Q: The price of stock A has a higher standard deviation than the price of stock B.  This tells that:…

A: We have given that the statement “The price of stock A has a higher standard deviation than the…

Q: The life expectancy of a particular brand of tire is normally distributed with a mean of 30,000 and…

A: Given that.   X~N( μ , ?^2 )   μ=30000    , ?=6000   Z-score =( x - μ )/?

Q: From a normally distributed population, we took a simple random sample of 700 students with a mean…

A: Sample size n=700 Sample mean x¯=640 Population Standard deviation σ=300

Q: A random sample of 30 packages for delivery in a store has an average weight of 305 grams. Assume…

A: (1) Obtain the standard error of the point estimate of the population mean. The standard error of…

Q: A car salesperson offers you a car at the price of $22,895. You look up the mean sales price for…

A: We have given that the random variable X that is sales price. Here, X = 22895 Mean = 21900 and…

Q: The scores on an aptitude test are normally distributed with a mean of 18 and standard deviation of…

A: Note: Hey, since there are multiple subparts are posted, we will answer first three subparts for…

Q: Tom's commuting time from his residence in Carmel to the IUPUI campus has a normal distribution.…

A: Given that  The Tom's commuting time from his residence in Carmel to the IUPUI campus has a normal…

Q: Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2 million in a…

A: Given that  Major league baseball salaries averaged $3.26 million with a standard deviation of $1.2…

Q: If a product has a mean demand of 80 with a standard deviation of 10, if the customer holds 100…

A:

Q: The standard deviation of a variable is 15. If a sample of 100 individuals is selected, what size is…

A:

Q: The senior Class of 2012 at Rancho High strongly believesthat they have better grades than their…

A: The paired t-test is used when: the sample sizes are equal. two samples are independent but the…

Q: For the binomial​ distribution, which formula finds the standard​ deviation?

A: Consider the terms for any binomial distribution.

Q: From a normally distributed population, we took a simple random sample of 700 students with a mean…

A:

Q: A manufacturer claims that a new design for a hands-free bluetooth device has increased the range to…

A: The following information is provided. Sample size, sample mean and sample standard deviation.…

Q: "The weights of 1,000 children, in average, is 64kg with standard deviation of 18kg. Suppose the…

A: Given that n=1000, mu =64 ,s.d =18 ,p(x<59 ) =?

Q: The Internal Revenue Service reports that the mean federal income tax paid in a recent year was…

A: In question, The Internal Revenue Service reports that the mean federal income tax paid in a recent…

Q: A scientist has read that the mean birth weight, μ, of babies born at full term is 7.3 pounds. The…

A: Given that a scientist has read that the mean birth weight, μ, of babies born at full term is 7.3…

Q: An accountant is studying the attendance levels at the concerts of a touring rock band. She finds…

A: Let x¯ be the mean number of attendees at a performance in her study for 62 performances which…

Q: In a random sample of 1000 students, 70% prefer to study at the school campus. The standard error…

A: Solution: Given:   n: size of random sample  = 1000 p: sample proportion          = 0.70…

Q: The commuting time for a student to travel from home to a university campus is Normally distributed…

A: Let X be the commuting time for a student to travel from home to a university campus is Normally…

Q: The symbol oz represents the standard deviation of a sample of size n. True O False

A: Answer : B. False

Q: A nutritionist claims that the mean tuna consumption by a person is 3.6 pounds per year. A sample of…

A: Given, A nutritionist claims that the mean tuna consumption by a person is 3.6 pounds per year. A…

Q: A&W offers a meal deal if you get burgers and fries. Within North America 65% of A&W customers opt…

A:

Q: The Bun-and-Run is a franchise fast-food restaurant located in the Northeast specializing in…

A: Solution Given  Sample size =n= 40 Sample mean = M= 20000 Population SD =a = 3000 1) Best point…

Q: An upscale women's clothing boutique in Laguna Beach, on average, has daily sales of $28,176.44. The…

A:

Q: most exhibition shows open early in the morning and closes late in the evening. a study of Saturday…

A: a) The time after the doors opened will 90%of the people who are coming to the Saturday show have…

Q: The average test scores in a Science class is normally distributed with a standard deviation of 8.…

A: From the above information we have, n=200x=170σ=8 We can use the following formula for estimate the…

Q: The results of a nationwide aptitude test in mathematics are normally distributed with 80 as the…

A: Solution

Q: The Department of  Administration surveyed recent graduates to get information on their starting…

A: We want to find the point estimate of standard deviation

Q: A popular restaurant chain advertises that it delivers orders within 30 minutes. Suppose the average…

A: Z=(x -mu ) ÷sigma

Q: An audit finds that the dollar amounts of invoices have a mean of $1,662 and a standard deviation of…

A: we have given that mu=1662 ,sigma =302 , n=50  X~N(mu=1662 , sigma^2=302^2) X is a normally…

Q: burban Families Watched An Average Of μ = 60 Minutes Of Television Each Day. Assuming That The…

A: Given dataMean µ = 60 minStandard deviation σ = 25 minutesa) proportion of 2-year-old children watch…

Q: The average price of a Google Chromebook is 21,100 php. Assuming that the prices are approximately…

A:

Q: Tubes are manufactured in a company that has a mean of life, (hr = 800) and a standard deviation of…

A:

Q: You toss a fair coin 70 times. What is the standard deviation of the expected number of heads? Group…

A:

Q: The volumes of soda in quart soda bottles are normally distributed with a mean of 32.3 oz and a…

A: It is given that the mean is 32.3 and standard deviation is 1.2.

Q: The weights of an adult female population of killer whales are approximately normally distributed…

A: Let, X1: The weights of an adult female population of killer whales & X1~Normal( 18000, 4000 )…

Q: College Professors have incomes with a standard deviation that is less than $21,000. A recent study…

A:

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

A: Given problem Given that   Credit Card Debt  It has been reported that the average credit card…

Q: Car Aircon claims that the average cost of car aircon installation and repairs is 11,000. A sample…

A: From provided information, it is claimed that the average cost of car aircon installation and…

Q: On average, accountants earn approximately an average of $6500 per year in the United States. Assume…

A:

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

A: GivenM=62.60Mean(μ)=63.80standard deviation(s)=2.66sample size(n)=25

Q: A Trucking Company claims that the mean weight for their delivery trucks when they are fully loaded…

A:

Q: A local store has found the expected number of smooshed donuts per dozen is 0.6, with a standard…

A: Here Take  RANDOM variable X = Number of smooshed donuts

Q: Solve the problems by following the steps and procedures in hypothesis testing. 3. It is reported…

A: Assume that μ is the average monthly salary of all private elementary School teachers.

Q: 1. Over the last several years, the use of cellphones has increased dramatically. An article in USA…

A: Given  Talking time   Sample size Mean Standard deviation Cell phone Men 100 372 120 Women…