4. The existing system for the production of a certain item has a mean of 50 seconds, and a standard deviation of 20 seconds. The company wishes to procure a new computerised system and to test the efficiency of the new system, 30 items are sampled giving a mean of 43 seconds. Test at both significant level stated below to decide whether the existing system should be replaced or not. a) 0.05 b) 0.01

Q: 1. The Department wants to know if the average working hours in preparing a full meal is 3 hours.…

A: For the given problems Formulate the null and alternative hypothesis of the following statements in…

Q: 18. An automobile manufacturer recommends oil change intervals of 3,000 miles. To compare actual…

A:

Q: If 80% ·of an ore stockpile consists of copper ore particl~s (the material or value) and 20% of…

A:

Q: 1. Weekly demand for smartphones at an Apple store is nor- mally distributed, with a mean of 500 and…

A: Given ROP=350 Formula for the ROP is given by ROP=Demand during lead time+safety stock Hence, Safety…

Q: Suppose the mean wait-time for a telephone reservation agent at a large airline is 42 seconds. A…

A: Given : Suppose the mean wait time for a telephone reservation agent at a large airline is 42…

Q: 6. A research article reported that for a random sample of 850 meal purchases made at fast food…

A: We have to perform left tailed test for the difference in means and since sample size is large…

Q: According the course handbook at a large university, the length of classes held on Monday (M),…

A:

Q: Suppose that the weights of 3200 registered female Great Danes in the United States are distributed…

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

Q: 2. A manufacturer of electronic kits has found that the mean time required for novices to assemble…

A: Given, A manufacturer of electronic kits has found that the mean time required for novices to…

Q: The issues surrounding the levels and structure of executive compensation have gained added…

A: Given: Population mean μ=10.32 Population standard deviation σ=9.78 Population size (N) = 500 Sample…

Q: 2. A district supervisor of a certain school surveyed 28 randomly selected teachers and found that…

A: For the given problem determine the appropriate test statistics

Q: An indu v plant wants to determine which of two types of fuel, electric or gas, is more cost…

A: We have given that,  Mean1 =51.68, and Mean2 = 46.40 . SD1 = 8.73, and SD2 = 8.22 . Sample size1 =…

Q: Suppose the mean wait-time for a telephone reservation agent at a large airline is 41 seconds. A…

A: Given  μ=41, n=250,  x¯=40.2, s=4.3

Q: 9. The Taylor Steel Company wants to determine whether there is a significant difference in…

A: Solution: Given information: n1= 130 Sample size of day shiftn2= 120 Sample size of night shiftx1=…

Q: Suppose the mean wait-time for a telephone reservation agent at a large airline is 45 seconds. A…

A:

Q: A restaurant chain has two locations in a medium-sized town and, believing that it has oversaturated…

A: Step-by-step procedure to obtain the test statistic using Ti83 calculator. Press STAT. Press STAT…

Q: 3. The sample mean weight of 65 adult African elephants was measured to be 14,325.62 pounds, with a…

A:

Q: Given that the height of college boys is normally distributed with mean 5'-2" and standard deviation…

A: Probability is the measure of likelihood. It is calculated by the values mean and standard…

Q: The issues surrounding the levels and structure of executive compensation have gained added…

A: Given, Sample mean, μ = 10.32 Standard deviation, σ = 9.78 Sample size, n = 32

Q: Consider a sample with data values of 27, 25, 20, 18, 30, 35, 29, and 25. Compute the range,…

A: Calculate Quartile deviation from the following data27,25,20,18,30,35,29,25

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

A: Answer:

Q: 7. A researcher wants to estimate the mean income of all physicians in a city at a 95% confidence…

A: Given,standard deviation(σ)=17500margin of error(E)=5000α=1-0.95=0.05α2=0.025Z0.025=1.96    (from…

Q: 2) Suppose that a manufacturer of laptop batternes claims that his product last more than 950 hours.…

A: Given : sample size, n = 45 sample mean, x̄ = 925 population standard deviation,σ=…

Q: In order to compare the real estate markets in Pittsburgh and Philadelphia, a realtor selected a…

A: The dot plots show that in the Pittsburgh sample the volatility of home prices is greater than in…

Q: Assume that the heights of men applying for military academy training are normally distributed with…

A:

Q: n a recent survey of nurses in Region X, it was found out that the average monthly net income of…

A: Given : Sample size (n) =158 Sample mean (X¯) = 9568.40 Population standard deviation (σ) = 1563.42

Q: Suppose that the waiting time for a license plate renewal at a local office of a state motor vehicle…

A: Solution: Let X be the waiting time for a license plat renewal at a local office of a state motor…

Q: Suppose that the incomes of all people in the United States who own hybrid (gas and electric)…

A: According to the central limit theorem, when a sample of size n is drawn from any population with…

Q: 10. A measure of the right atrial pressure (mm Hg) was made for cardiac patients who were given…

A: The appropriate test statistic to conclude the indifference between the mean right atrial pressure…

Q: Suppose that the makers of Duracell batteries want to demonstrate that their size AA battery lasts…

A: Hypotheses for the test are given below: H0:μ1-μ2≤45H1:μ1-μ2>45

Q: Suppose the mean wait-time for a telephone reservation agent at a large airline is 45 seconds. A…

A:

Q: For a certain drug, based on standards set by the United States Pharmacopeia (USP) - an official…

A: given  For a certain drug, based on standards set by the United States Pharmacopeia (USP) - an…

Q: The manufacturer of a certain brand of auto batteries claims that the mean life of these batteries…

A: Given, x=46.05n=25σ=5.1α=0.025 The hypothesis to be tested here is: H0:μ=50H1:μ<50 This is a left…

Q: A manufacturer of electronic kits has found that the mean time required for novices to assemble its…

A: As per our policy we can solve only 1 question per post. Kindly post again for remaining questions.…

Q: director

A:

Q: 1- Applying for a specific job requires obtaining the mark of 500 in the contest exam. If 16 persons…

A:

Q: Let’s suppose the normally distributed population of women in Vigo County, Indiana has a mean…

A:

Q: The existing system for the production of a certain item has a mean of 50 seconds, and a standard…

A: To test at both significant level stated below to decide whether the existing systemshould be…

Q: Suppose the mean wait-time for a telephone reservation agent at a large airline is 45 seconds. A…

A: Given the test is left tailed and p value = 0.002

Q: A national business magazine reports that the mean age of retirement for women executives is 61.0. A…

A:

Q: For a normally distributed data set with mean 20 and standard deviation 4.  According to the…

A: Solution-: Given: μ=20,σ=4 We want to find what percentage of the data lies between 8 and 32?

Q: 3. Based on information from the U.S. Census Bureau, the mean travel time to work (mins), for all…

A: A hypothesis test can be used to make conclusion about the population mean. The null hypothesis…

Q: The town of KnowWearSpatial, U.S.A. operates a rubbish waste disposal facility that is overloaded if…

A: Solution: We are given:

Q: The lecturer are concerned that students who enrolled for the course this semester are spending more…

A: From the given information, H0: The mean is at least 6 hours. H1: The mean is less than 6 hours.…

Q: For a certain drug, based on standards set by the United States Pharmacopeia (USP) - an official…

A:

Q: 3. A production engineer claims that the time a trained worker should be able to assemble a certain…

A: The following information has been given: Hypothesized mean μ0=12. Sample mean x¯=12.75. Sample size…

Q: 2.) A ski gondola in Vail, Colorado that carries skiers up a mountain bears a plaque stating that…

A: n=12, maximum weight = 2004 mean = 188.6  std.dev = 38.9

Q: Suppose the mean wait-time for a telephone reservation agent at a large airline is 42 seconds. A…

A: Given: sample size =n=250 sample mean=x=41.3 standard deviation=s=4.2 significance level=α=0.05

Q: A random sample of 100 two-month old babies is obtained, and the mean head circumference is found to…

A: Null hypothesis: The population mean is 40.0 cm. Alternative hypothesis: The population mean is not…