2. Fifty applicants took an IQ test and their mean score was 100 with a standard deviation of 20. Assuming that the management decided not to hire the lowest 20% of the applicants, what was the minimum score to get hired?

Q: Would a person spending $476 on their car be considered usual or unusual if the amount spent by the…

A: Given information- Population mean µ = $347 Population standard deviation, σ = $39.58 Let, X be the…

Q: The U.S. Department of Transportation provides the number of miles that residents of the 75 largest…

A:

Q: The average farm size in the United States is 444 acres. A random sample of 40 farms in Oregon…

A: Null hypothesis: H0: μ = 444. Alternative hypothesis: HA : μ ≠ 444 Central Limit Theorem for mean:…

Q: For a sample of  400 individuals who filed a tax return between April  10th and 15th, the sample…

A: Individuals filling federal income tax returns prior to march 31 received an average refund of $1070…

Q: at on one section of the SAT the mean is 500 and the standard deviation is 100, what is the…

A: From the given information, Consider, X be the random variable that shows the scores of a students…

Q: 2. A Flemish student organisation claims that the average undergraduate student loan debt at a…

A: Hello there!! Thank you for the question, As per the honor code, we are allowed to answer three…

Q: A group of 123 bunnies had a mean hopping distance of 48 inches and a standard deviation of 3.5…

A: To find the number of: a) Bunnies will hop between 41 and 44.5 inches b) Bunnies will hop between 48…

Q: A motor club wishes to estimate, to within five cents, the mean price of a gallon of gasoline in a…

A: Given information: A motor club wishes to estimate to within five cents. ME=5 Population standard…

Q: A manufacturer claims that the average lifetime of his lightbulb is 3 years or 36 months. The…

A: The one-sample z-test is used to test whether the mean of a population is greater than, less than,…

Q: Second Hand Smoke: Cotinine levels were measured in a group of 40 non-smokers exposed to tobacco…

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Q: Is it worth pursuing a doctoral degree in education if you already have an undergraduate degree? One…

A: The confidence interval is calculated using the combined value of sample statistic and the margin of…

Q: In a medical study, a researcher wishes to select respondents in the middle of 45% of the population…

A: Given, In a medical study, a researcher wishes to select respondents in the middle of 45% of the…

Q: In preparation for the upcoming school year, a teacher looks at raw test scores on the statewide…

A: Let Z be the standard normally distributed random variable with mean 0 and standard deviation 1.

Q: Data was collected on the number of television sets in a household, and it was found that the mean…

A: It is an important part of statistics. It is widely used.

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

A:

Q: The energy information Administration reported that the mean retail price per gallonof regu lar…

A:

Q: 4-A health maintenance organization (HMO) wants to estimate the mean length of a hospital stay. How…

A: The random variable length of a hospital stay follows normal distribution. The margin of error is…

Q: If the mass of 35 dogs in your neighborhood were normally distributed, with a mean of 11.2 kg and a…

A: Given data: Mean = 11.2 kg Standard deviation = 2.8 kg

Q: 9) In a class of 30 students, how many students failed the test (below 64), if the mean grade on a…

A:

Q: Suppose the mathematics SAT scores are normally distributed with a mean of 500 and a standard…

A:

Q: The board of examiners that administers the real estate broker's examination in a certain state…

A: Given, Mean = μ=440SD=σ=72Probability = 0.1

Q: A custodian wishes to compare two competing floor waxes to decide which one is best. He believes…

A:

Q: director

A:

Q: 4.) In order to determine the effect of music on the speed of students in answering exams, an…

A:

Q: 1. A business consultant wanted to investigate if providing day-care facilities on premises by…

A: Let, 1: Provided day-care facilities 2: Not provided day-care facilities Given:

Q: Assume that the test scores from a college admissions test are normally distributed, with amean of…

A:

Q: The board of examiners that administers the real estate brokerʹs examination in a certain state…

A: According to the provided information, Mean = 494 Standard deviation = 72

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: Sam Ying, a career counselor, claims the average number of years of schooling for an engineer is…

A:

Q: The mean number of travel days per year for salespeople employed by three hardware distributors…

A:

Q: 4.15. If the local restaurants in a small town record an average of 92 customers a day, with a…

A:

Q: VII. The NYC MTA claims the average wait time for an F train after midnight is less than 21 minutes.…

A: Given, μ = 21n = 15X¯ = 24S = 9     Test the claim that the average wait time for an F train after…

Q: 6) A music industry professional claims that the average amount of money that an average teenager…

A: Given that  Hypothesized Population Mean (\mu)(μ) = 5050 Population Standard Deviation…

Q: 4. The results of a state-wide examination of the reading skills of sixth-grade students were…

A: For X, a random variable, the Z-score is, Z=X-μσwhere, μ=population mean             σ=population…

Q: agent claims that mean household incomes in Fairfax and Arlington are equal. Draw 32 residents…

A: A z-test for two means is a hypothesis test that attempts to make a claim about the population…

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

A:

Q: c. Analyzing delivery records for 18 customers from "Jalwa" tailoring company, you found their mean…

A: Hypothesis test used estimate whether there is any mean significant difference between the sample…

Q: In​ 2007, the mean property crime rate​ (per 100,000​ people) for the 24 states west of a certain…

A: Given Information: Mean property crime rate​ (per 100,000​ people) for the 24 states west of a…

Q: In preparation for the upcoming school year, a teacher looks at raw test scores on the statewide…

A:

Q: The mean grade of Adrian in the final examination in mathematics was 85 and the standard deviation…

A: 1) Given that: Mean for mathematics = 85 Standard Deviation for mathematics = 7 Mean for science =…

Q: 4. The lowest and the highest data value of a data set are 12 and 28 respectively, then the…

A:

Q: The average undergraduate cost for tuition, fees, and room and board for two-year institutions last…

A: Given, n =  μ = 13252x¯ = 15560s = 3500α = 0.01

Q: A Physics test has a mean of 150 and a standard deviation of 12.  A Geography test has a mean of 46…

A: Solution: Let X be the physics test and Y be the geography test. From the given information, X has…

Q: According to Consumer Expenditures, the average consumer spent $1729 on apparel and services in…

A: Given information- Population mean, μ = $1729 Sample size, n = 36 Sample mean, x-bar = $1667.11…

Q: In preparation for the upcoming school year, a teacher looks at raw test scores on the statewide…

A: Formula of z score : z = x - μσ

Q: The following are grade point averages measured in a sample of 8 undergraduate students who are…

A: Solution: Let X be the grade point average. The given data is 3.28, 2.97, 3.05, 3.61, 3.39, 2.95, 3…

Q: 2. Alfred scored 82 in a quiz in English for which the average score of the class was 75 with a…

A: GivenAlfred scored 82 in a quiz in english with Mean(μ)=75standard deviation(σ)=10score 70 in a quiz…

Q: 3. In the qualifying examination for the admittance to college, the mean score was 65 and the…

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

Q: The mean grade of Adrian in the final examination in mathematics was 85 and the standard deviation…

A: For mathematics :mean(μ)=85standard deviation(σ)=7For sciencemean(μ)=89standard deviation(σ)=13

Q: 16. Determine the mean number of books sold in an hour at that local book store. 17. Find the…

A: