In tests of a computer component, it is found that the mean time between failures is 674 hours. A modification is made which is supposed to increase reliability by increasing the time between failures. Tests on a sample of 38 modified components produce a mean time between failures of 703 hours, with a standard deviation of 68 hours. Test the claim that on average, the modified components last longer than 674 hours between failures, use a level of significance of 1%.   What evidence justifies the use of this test? Check all that apply: np>5 and nq>5 The sample standard deviation is not known The population standard deviation is known There are two different samples being compared The population standard deviation is not known The sample size is larger than 30 The original population is approximately normal   What is the test statistic for the given statistics? What is the p-value for this test?

Q: In tests of a computer component, it is found that the mean time between failures is 911 hours. A…

A: Given  n=25, Xbar=957, alpha=0.01, sigma=sd=52

Q: he mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A: As the population standard deviation is known, we will use z test. The null and alternative…

Q: row, and reproduces rapidly. The length of the thorax (where the wings and legs attach) in a…

A: Given Mean =0.800 Standard deviations=0.078

Q: A research firm supplies manufacturers with estimates of the sales of their products from samples of…

A: Confidence interval give a range of values for the unknown parameter of the population. The width of…

Q: The manufacturer of a particular brand of tires claims they average at least 82,000 km before…

A: Note- Since you have posted a question with multiple sub-parts, we will solve the first three…

Q: he mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A:

Q: In tests of a computer component, it is found that the mean time between failures is  917  hours. A…

A: Solution-: Given: μ0=917,σ=57,x¯=963,n=25,α=0.01 We want to perform a hypothesis test to determine…

Q: puter component, it is found that the mean time between failures is 674 hours. A modification is…

A: Note: As per the guidelines, we are only allowed to solve three subparts, please post the other…

Q: The average wait time to get seated at a popular restaurant in the city on a Friday night is 10…

A: It is given that the p-value is 0.9396.

Q: An electrical firm manufactures light bulbs that have a lifetime that is approximately normally…

A: Given  Hypothesis  Ho: mu=750 vs H1: mu not =750  Sigma=sd=35, mu=750, n=26, Xbar=728

Q: Q3 11kV SF6 circuit breakers in electrical distribution substations in an industrial park must be…

A:

Q: A new iron supplement is being tested to see if it can increase the mean of ferritin levels. Study…

A: Given Information: Group 1: Sample size n1=30 Sample mean x¯1=43 Sample standard deviation s1=13…

Q: The average length of time it takes to read a book can differ from one generation to another.…

A: Population standard deviation ()= 2.2population mean ()= 17sample mean  = 16.1sample size (n) = 50It…

Q: A research program used a representative random sample of men and women to gauge the size of the…

A: Given, Sample mean, x¯ = 14.8 s = 9.9 n = 2820 Significance level, α = 0.5

Q: In tests of a computer component, it is found that the mean time between failures is 920 hours. A…

A: Solution: Given information: n= 36 Sample size  x= 966  hours Sample mean μ=920  hours  Population…

Q: If the standard deviation of the medicine concentrations was 50 ppm and their mean was 450 ppm, test…

A: Question: To confirm the effectiveness of some medicine, its concentration in blood must exceed…

Q: ccording to the National Sleep Foundation, all children should get 10 hours of sleep each right. In…

A: GIVEN DATA, n=56x¯=8.9s=3.2claim: μ<10α=0.01

Q: the circuit breakers will fail less than 10 months after the last maintenance work due to the…

A: According to the given information in this questionThere are more than three subparts according to…

Q: The historical data of Velvetta Inc., a healthcare products manufacturer, have shown that in a…

A:

Q: (a) (b) (c) Write the null hypothesis, alternative hypothesis and claim for X. Determine the test…

A: Given: Sample size, n =30 Sample mean, x¯=6854 Sample standard deviation, s=766

Q: The breaking strengths of cables produced by a certain manufacturer have historically had a mean of…

A: The provided information is x¯=1756σ=50n=90α=0.05The null and alternative hypothesis is…

Q: In 2010, the mean years of experience among a nursing staff was 14.3 years. A nurse manager took a…

A: Answer  Population mean μ =14.3 Sample mean = x = 18.37 Sample size = [n] =35 Standard deviation =…

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.9…

A: The sample of 30 smokers found that their mean starting age was 12 years old; n=30 mean starting age…

Q: The mean time spent on studies of all students at a university last year was 40 hours per week. This…

A: Solution-: Given: μ0=40,σ=13.85,x¯=42.1,n=35 Here, σ- is known so we use Z-test We compute…

Q: A manufacturer of plasma has determined that the televisions require servicing after a mean of 67…

A: Let x be the length of warranty should be offered which follows normal distribution with mean 67 and…

Q: Suppose the population mean is known to be 42.8 minutes with a population standard deviation of 14.7…

A: It is given that  Population mean = 42.8 Population standard deviation = 14.7 Sample mean = 44.783…

Q: research firm supplies manufacturers with estimates of the sales of their products from samples of…

A: Given Data : For Sample 1 x̄1 = 41 n1= 50 s1= 11 For Sample 2…

Q: n a scientific study conducted by the Dax Science Lab on Deep Space Nine, 41 male rats were sent to…

A:

Q: A dairy farm uses the somatic cell count (SCC) report on the milk it provides to a processor as one…

A: Denote μ as the population mean SCC of all milk produced.

Q: The mean BMI in patients free of diabetes has been reported as 27.8. An investigator measured BMI in…

A:

Q: Q3 11kV SF6 circuit breakers in electrical distribution substations in an industrial park must be…

A: Given that: Sample size, n = 30 Sample mean, x¯=6845 Sample standard deviation, s = 766 Significance…

Q: According to some studies, a vacuum cleaner uses an average of 46 kilowatt hours per year. If a…

A: From the given information we conduct T test for one mean.

Q: Studies by the U.S. Dept. of Education have shown that when full-time undergraduate students work at…

A:

Q: Dunlop Company conducts tests on tires life. For a particular tires, the standard deviation is 6000…

A: From the provided information, Standard deviation (σ) = 6000 kilometres The 68% of tires life failed…

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A: Given: n= 30.0 ,x̄= 12.2 ,σ= 1.8 µ= 13.0 ,significance level(∝)= 0.1       ​

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.