41. A fitness magazine advertises that the mean monthly cost of joining a health club is $25. You want to test this claim. You find that a random sample of 18 clubs has a mean monthly cost of $26.25 and a standard deviation of $3.23. At a = 0.10, do you have enough evidence to reject the advertisement's claim?

Q: 11) Find the score that separates the top 80% from the bottom 20% if the Mean is 100 and the…

A: Given: Using Z table or excel command =NORMSINV(0.20) we get,

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

A:

Q: 2. The head of a school clinic in a certain elementary school wants to estimate the mean height (in…

A: Given that alpha =0.05,s.d =30 ,M.E = 4

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: 17) The Welcher Adult Intelligence Test Scale is composed of a number of subtests. On one subtest,…

A: Note: Hi there! Thank you for posting the question. As there are several independent questions,…

Q: 9.16 A bottled water distributor wants to determine whether the mean amount of water contained in…

A:

Q: The duration of an NBA basketball game during the 2019-20 season is normally dis- tributed with the…

A: Solution: 4. Let X be the duration of an NBA basketball game during the 2019-2020 season. From the…

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: Suppose that the distribution of income in a certain tax bracket is approximately normal with a mean…

A: Probability distribution: A probability distribution function is the statistical function that…

Q: In Hidalgo County, Texas, 80% of those eligible for jury duty were Mexican- Americans. Assuming that…

A: Obtain the mean for the numbers of Mexican-Americans. The mean for the numbers of Mexican-Americans…

Q: The operation manager at a tire manufacturing company believes that the mean mileage of a tire is…

A: The sampling distribution of sample mean follows the normal distribution, if the population is…

Q: 47 If the mean of a test score is 30 and the standard deviation is 3.7, which score could be…

A:

Q: In 1955, Life Magazine reported that the 25 year-old mother of three worked, on average, an 80hour…

A: Solution: Given information: n= 85 Sample size  x= 83.5 Sample mean μ= 80 Populaion Mean s= 10…

Q: Suppose that a large Introduction to Psychology class has taken a midterm exam, and the scores are…

A: (1) Obtain the proportion of the class got scores above 90. The proportion of the class got scores…

Q: An economic analyst believes the average income for the United States equals $44,000. Suppose  she…

A: Given that  Sample size n =900 Sample mean =43250 Population standard deviation =7500

Q: 2. A normally distributed set of 968 values has a standard deviation of 11 and a mean of 108. Which…

A:

Q: 3. The amount dispensed by the coffee machine follow the normal distribution with a mean of 5,286…

A:

Q: 1. The average grade of 2nd year students majoring in Civil Engineering is normally distributed with…

A: NOTE- AS PER POLICY I HAVE CALCULATED FIRST MAIN QUESTION ONLY      Here Given For  Civil…

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: 3. Assuming that you wished to have the highest possible score on an exam relative to other scores;…

A:

Q: 1. Suppose that we want to estimate to within $1000 the mean salary of all graduates who were…

A: Given,margin of error(E)=1000standard deviation(σ)=5000α=1-0.95=0.05α2=0.025z0.025=1.96

Q: A college professor calculates the standard deviation of all the grades from the midterm exams she…

A: Standard deviation: The standard deviation indicates by how much each observation differs from a…

Q: According to data from the 2010 United States Census, 64.2% of Americans in Susanville, CA were…

A: 64.2% of Americans in Susanville, CA were male, p = 0.642 Sample size, n = 100 Among the sample, 54…

Q: 4. In studying ocean conditions, the Bureau of Fisheries found that for one location, the August…

A: Given ,Mean μ = 83.6Standard deviation σ=24Let  x be temperature normally distributed

Q: b) The American Automobile Association reports that the average time it takes to respond to an…

A: Given  μ=38, σ=9.002 and n=80

Q: A researcher wishes to estimate within $200 the mean amount of money a county spends on road repairs…

A: When the population standard deviation is known, then the margin of error is calculated by ME=z*σn,…

Q: The blood cholesterol levels of men age 55 to 64 are approximately Normal, with mean 222 milligrams…

A: 4. Given that μ=222σ=37 (a) The percent of these men have high cholesterol is,…

Q: reported that the 27-year-old mother of three worked, on average, a 75 hour week. Recently, many…

A: As the population standard deviation is not known, we will use a t-test. The null and alternative…

Q: 4. A wildlife study is designed to find the mean weight of salmon caught by an Alaskan fishing…

A: Here sample size, n=50≥30. Thus, the central limit theorem holds true. Let x¯ and μ denote the…

Q: 14) Find the score that separates the top 80% from the bottom 20% if the Mean is 100 and the…

A: Given information Mean (µ) = 100 Standard deviation (σ) = 26 The score that separates the top 80%…

Q: A population has µ = 50 and o - 5. If 10 points are added to every score in the population, what are…

A:

Q: A population has a standard deviation of σ = 24. a.  On average, how much difference should exist…

A: Given : A population standard deviation : σ=24. The average distance of sample mean from population…

Q: 3. The foreign service exam gives passing grade to only the top 10% of those taking the exam. The…

A:

Q: 1. For each day of last year, the number of vehicles passing through a certain intersection was…

A: The provided information is  µ=375 σ=25 P(X>425)=P(X-µσ>425-37525)=P(Z>2)=0.0228=2.28%

Q: 4. On a standardized test, scores are normally distributed with a mean of 400 and a standard…

A: GivenMean(μ)=400standard deviation(σ)=80

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

A:

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

A:

Q: 2.5% Of scores on a normally distributed college entrance test or below 60% and 2.5% of the scores…

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: 2-An analysis of the grades on the first test in History 101 revealed that they approximate a normal…

A: According to the provided information, The grades of A to the upper 10 percent of the test grades.…

Q: In order to set rates, an insurance company is trying to estimate the number of sick days that full-…

A:

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: 2) A restaurant association claims that the average amount a family spends per year eating out is…

A:

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: The president of a college wants to determine the mean number of units that college students take…

A: From the given information, the population standard deviation is 2.1 units, the confidence level is…

Q: In 1955, Life Magazine reported that the 27 year-old mother of three worked, on average, an 75 hour…

A:

Q: Find the Mean and Standard Deviation for the prompts below: 5.)  A survey found that 86% of…

A: 5. Given: p=0.86n=121-p=0.14 The probability that 10 or more would have never been the victim of a…

Q: A population has μ = 50 and σ = 5. If 10 points are added to every score in the population, what are…

A: Consider, (µ) = 50 and (σ) = 5 Let, X be the scores of the population. If 10 points are added to…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.