The Edison Electric Institute has published figures on the number of kilowatt hours used annually by various home appliances. It is claimed that a vacuum cleaner uses a n average of 46 kilowatt hours per year. If a random sample of 12 homes included in a planned study indicated that vacuum cleaners use an average of 42 kilowatt hours per year with a standard deviation of 11.9 kilowatt hours, does this suggest at the 0.05 level of significance that vacuum cleaners use, on average, less than 46 kilowatt hours annually? Assume the population of kilowatt hours to be normal.

Q: Round your all answers to two decimal places. a. What is the point estimate of the difference…

A: Introduction: The 100 (1 – α) % confidence interval for the difference between population means, μ1…

Q: 1) A company reports that the mean weight of yearling Angus steers is 1152 pounds with a standard…

A: We have given that  X~N(mu, sigma^2) mu=1152 ,sigma =84 Z-score =(x-mu )/sigma    Note :-According…

Q: Condé Nast Traveler conducts an annual survey in which readers rate their favorite cruise ship. All…

A:

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A:

Q: Suppose that grade point averages of undergraduate students at one university have a bell-shaped…

A: Given, grade point averages of undergraduate students at one university have a bell-shaped…

Q: adway Section 40 has an accident rate of 230 accident per 100 million vehicle miles VM). The mean…

A: We have given that  Sample size n = 230 Sample mean = 94 Standard deviation = 70 90 % confidence…

Q: 4. Felician University uses hundreds of fluorescent light bulbs each year. The brand of bulb it…

A: The mean lifetime of current brand that it uses is of 900 hours. The mean and standard deviation of…

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A: We have given that the random variable X i.e. lightbulb is normally distributed with mean 59 and…

Q: An earlier exercise posed the following research question: "Many cars have a recommended tire…

A: From the provided information, Sample size (n) = 65 Sample mean (x̄) = 29.8 Standard deviation (s) =…

Q: n a mid-size company, the distribution of the number of phone calls answered each day by each of the…

A: Given that, Mean = 39 Standard deviation = 7

Q: . A random sample of 30 warehouses was selected as part of a tudy on electricity usage, and the…

A: Given information: The sample size is n = 30. The sample mean usage in March quarter of 2019 is…

Q: Find the percentage of men meeting the height requirement. What does the result suggest about the…

A: Given that  For Women Mean = W = 62.3 , Standard deviation = Sd = 3.7 For Men  Mean = M = 69.4 ,…

Q: Suppose the life span of a calculator manufactured by Texas Instruments has a normal distribution…

A:

Q: A researcher wishes to determine whether the blood pressure of vegetarians is, on average, lower…

A:

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: Empirical reules:1)68% of observations falls within the first standard deviation (µ ± σ)2)95% within…

Q: A tire company finds the lifespan for one brand of its tires is normally distributed with a mean of…

A: Solution: Let X be the lifespan for one brand of its tires is normally distributed with a mean of…

Q: determine the percent of batteries that can be expected to require repair or replacement under…

A: Let X be the random variable that breakdown times. Given that, X ~ N(μ=50, σ=6) The warranty on a…

Q: The objectives of a study were to describe the menopausal status, menopausal symptoms, energy…

A: Given Information : The objectives of a study were to describe the menopausal status, menopausal…

Q: A survey found that​ women's heights are normally distributed with mean 63.6 in and standard…

A: Answer  Given  Mean =63.6 standard deviation =2.5 We know that Z-score:  Z =[x-mu]/[σ] z*σ =[x-mu]…

Q: 2. A random sample of 30 warehouses was selected as part of a study on electricity usage, and the…

A: As per given information: The mean usage of 2019 was: X=375 kWh The sample standard deviation is:…

Q: In a recent study, the Center for Disease Control reported that diastolic blood pressure (in mmHg)…

A:

Q: Suppose the birth weights of babies in a particular country are normally distributed with a mean of…

A: Answer:

Q: 3. A specific point of a highway has a speed limit of 60 Km/h. The Highway Patrol wants to perform a…

A:

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

A: Normal distribution

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A: Given information : Mean = x = 46 Standard deviation = σ = 7

Q: A person must score in the upper 0.15% of admission test scores in order to qualify for a very…

A: A person must score in the upper 0.15% of admission test scores in order to qualify for a very…

Q: The average gasoline price of one of the major oil companies has been $2.20 per gallon.because of…

A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want…

Q: If your claim is in the alternative hypothesis and you fail to reject the null hypothesis, then your…

A: Given data: claim = alternative hypothesis and we fail to reject the null hypothesis, To decide:…

Q: The physical plant at the main campus of a large state university receives daily requests to replace…

A: We want to find the probability by using emperical rule

Q: Consider the population of commuting time to school for all John Jay College students during Spring…

A:

Q: A shareholders' group is lodging a protest against your company. The shareholders group claimed that…

A: Given information- Population mean, μ = 11 years Sample size, n = 85 Take significance level, α =…

Q: A study by researchers at a university addressed the question of whether the mean body temperature…

A: From the given information, the claim of the problem is, "whether the mean body temperature of…

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: Given Information: Mean μ=48 Standard deviation σ=7 Using empirical rule, to find the approximate…

Q: Suppose a small paint manufacturing company has a daily production that is normally distributed with…

A:

Q: Consider a dataset containing the heights of 38 females who said they prefer to sit in the front of…

A: Givensample size(n)=38Mean(x)=62standard deviation(s)=2.5significance level(α)=10%=0.10The null and…

Q: Consider a data set that has a mean of 33.7 and a standard deviation of 6.8. According to…

A: Suppose X is a random variable with expectation, μ and standard deviation, σ. Then, for any positive…

Q: Assume weights of adult males in the US are approximately normally distributed with a mean of 195…

A: Given that: Population mean, μ=195 Population standard deviation, σ=30