A manufacturer of dry cells claimed that the life of their cells is 24.0 hours. A sample of 10 cells had mean life of 22.5 hours with a standard deviation of 3.0 hours. On the basis of available information, test whether the claim of the manufacturer is correct.

Q: The time that a shopper spends in the grocery store is normallydistributed, with a mean of 45…

A: Given Information: The time that a shopper spends in the grocery store is normally distributed with…

Q: A computer manufacturer claimed that the mean weight of their laptops is 5.5 pounds. A sample of 125…

A: Given Information: Population mean (u) = 5.5 pounds Standard Deviation (s) = 1.1 pounds Sample mean…

Q: A job placement director claims that the average starting salary for nurse is $25000. A sample of 15…

A: The null and the alternative hypothesis are based on the population mean: H0 : μ = 25000H1 : μ ≠…

Q: A bottling company produces bottles that hold 10 ounces of liquid. The company gets complaints that…

A: Given that: μ=10 Number of samples: n= 24 Average of the liquid: x=9.8 standard deviation: σ=0.3

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: An automobile insurance company claims that its rates for teenage drivers average $470 less per year…

A: Given: population mean = 470sample size=30sample mean = 435std deviation =65

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

A: Solution: Let X be the number of daily requests. From the given information, X follows normal…

Q: A factory manufacturing light emitting diode LED bulbs claims that their light bulbs last for 50,000…

A: A confidence interval is an inference method which gives the range of plausible values of the…

Q: A local church parish wants to raise money to add to their campus. In a sample from a previous fund…

A: Given, -x1 = 893, n1 = 67, s1 = 282 -x2 = 1180, n2 = 49, s2 = 371 α = Level of significance = 0.05

Q: The average standard deviation of the waiting time for a single queue is 4.7 minutes. The average…

A: The hypotheses for the test are given below: Null hypothesis: H0: σ=4.67. Alternative hypothesis:…

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

A: Given :

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: The producer of a certain medicine claims that their bottling equipment is very accurate and that…

A:

Q: A food company is concerned that its 16-ounce can of sliced pears is not being filled correctly. The…

A: State the hypotheses That is, the mean weight is equal to 16 ounces. That is, the mean weight is…

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

A: For an average 20-29 year old man: mean = 69.8 standard dev = 3.2 For an average 20 - 29 year old…

Q: At the 0.05 level of significance, is there evidence that the mean life is different from 375hours?

A: Here sample size n =64 Population standard deviation = 100 hours Sample mean = 350 hours Here claim…

Q: A chemical engineer claims that the average daily yield of a chemical manufactured in a chemical…

A: The standard error is,

Q: A job placement director claims that the average starting salary for nurse is $26000. A sample of 18…

A: Given,sample size(n)=18sample mean(x¯)=25620standard deviation(s)=680α=0.05

Q: A local church parish wants to raise money to add to their campus. In a sample from a previous fund…

A: Given, Sample from a previous fund raising campaign has n1=134X1=67x1=$893s1=$282 Sample proportion…

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: The manufacturer of the X-15 steel-belted redial truck tire claims that the mean mileage the tire…

A: Note: Hi there! Thank you for posting the question. As your question have posted multiple questions,…

Q: A recent study of 1,215 randomly selected middle school students revealed that the average number of…

A: From the provided information, Mean (µ) = 180 minutes Standard deviation (σ) = 45 minutes X~N (180,…

Q: In a certain​ city, the average​ 20- to​ 29-year old man is 69.6inches​ tall, with a standard…

A: Consider a random variable X which represents the height of 20 to 29 year-old man. The average…

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

A: Given information- Mean weight of the bears, µ = 80 thousand miles Population standard deviation, σ…

Q: A certain brand of automobile tire has a mean life span of 37,000 miles and a standard deviation of…

A: According to our policy we can answer only first three part for remaining please repost the…

Q: A travel analyst claims that the mean room rates at a three-star hotel in Chicago is greater than…

A: Given dataSample size = 36Sample mean = 163Hypothesized mean = 152Population standard deviation =…

Q: the standard error of the mean for a random sample of 49 tax returns is ________.

A: Given information Mean = $ 1,949 Standard deviation = $750 Sample size = 49

Q: A quick survey of peanut butter prices had standard deviation and mean of $0.26 and $3.68,…

A:

Q: The credit manager of a department store chain believes that the average age of charge-account…

A: Given two problems related to hypothesis testing. We have to solve the problems as indicated.

Q: In a certain city, the average 20- to 29-year old man is 69.6 inches tall, with a standard deviation…

A:

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

A: Solution-: Let, X= The distance traveled per truck per year Given: We find, P[ either less than…

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

A: Mean (man)=69.8Standard deviation (man)=3.0Mean (woman)=64.1Standard deviation (woman)=3.9

Q: An LED lightbulb manufacturer produces lights with a mean lifespan of 10,000 hours and a standard…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: The manufacturer of a battery claims that the mean life of it is 8 months. An agency took a sample…

A:

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

A: z- score for a 75-inch man =  0.833 z- score for a​ 70-inch woman = 1.447

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

A: Given: For females Mean μf=64.5 Standard deviation σf=3.8 Observed value (Xf) = 70 For males Mean…

Q: The manufacturer of a particular brand of tires claims that its deluxe tire averages at least 50,000…

A:

Q: A CHED commissioner claims that the average cost of one year's tuition for all private colleges in…

A: Given that sample size n = 15 Sample mean = 31080 Sample SD = 400 Level of significance = 0.01

Q: A high end store is looking to open new stores, but requires that 85% of the households in a…

A: Let X= income of the households  Given that X is normally distributed with mean= 98000 and standard…

Q: An electrical contractor has concluded that the average home uses at least 500 yards of electrical…

A:

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

A: 72.5 3.1 75 64.3 3.8 70

Q: The amount of time a certain brand of light bulb lasts is normally distributed with a mean of 1200…

A: Let X denote the amount of time a certain brand of light bulb lasts. Given that X follows N(mean =…

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

A:

Q: A local Chamber of commerce Claims that the mean family income in aſcity is $12,250 An economist…

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

Q: A job placement director claims that the average starting salary for nurse is $26000. A sample of 18…

A: Yes, There is enough evidence to reject the directors claim at 5% l.o.s.

Q: An editor for a large book distributor claims the mean time required to write a textbook is at least…

A:

Q: The director of vehicle maintenance for a large mass transportation authority wants to know the…

A: In this question, we have a sample of 100 tires and mean life of tire is 20,000 miles and standard…

Q: A travel analyst claims that the mean price of a round trip flight from New York City to Los Angeles…

A: Solution:

Q: A marine biologist claims that a harbor seal's average dive time is at least 5.8 minutes. A random…

A:

Q: A local community college reported that the average SAT score of its students is 960with a standard…

A: mean = 960 s = 80 xbar = 975