A sample size of 115 is selected from a population with the proportion equal to 0.61. The sample proportion has an expected value of __ and standard deviation of __.     0.41 and .0505     0.61 and 0.0455     61 and 0.0455     61 and 4.55     None of the above

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A: Given: The sample number of records of gas mileage is n=20. The population standard deviation is…

Q: A traffic survey found that that 74% of cars on a highway drive over the displayed speed limit. A…

A: Given that n = 1130,p =0.74 Find ( a ) E( x) =? sigma = ? ( b ) Is 666 cars unusually high,loe or…

Q: The gestation period of humans follows a normal distribution with a mean of 266 days and a standard…

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Q: A population has a standard deviation of 16. If a sample of size 64 is selected from this…

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Q: t is known that the incomes of subscribers to a particular magazine have a normal distribution with…

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Q: The population of weights for men attending a local health club is normally distributed with a mean…

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A:

Q: From a sample of 100 tires the mean lifetime was 46,000 miles with a standard deviation of 5,500…

A: Given: n=100x¯=45000s=5500μ=45000

Q: A sample is selected from a population with a mean of µ = 40 and a standard deviation of σ = 8 a.…

A: Given: μ=40 and σ=8. a) Here, n=4. Then,EM=μ=40 AndSDM=σn=84=82=4 Therefore, the expected value of M…

Q: An elevator has a placard stating that the maximum capacity is 2295lb—15 passengers.​ So,15 adult…

A: From the provided information, Mean (µ) = 163 lb Standard deviation (σ) = 31 lb X~N (163, 31) Here X…

Q: PVC pipes is manufactured with a mean diameter of 1.01 inch and a standard deviation of 0.003 inch.…

A: According to central limit theorem if the population is normal or the sample size is more than 30…

Q: b. The weekly amount spent for maintenance and repairs in a certain company was observed, over a…

A: We have to find given probability.

Q: The process of being served at a bank consists of two independent parts-the time waiting in line and…

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Q: Thwhe average arm height of jaguars is 16 inches, with a standard deviation of 2 inches. out of a…

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Q: In a large city it was found that summer electricity bills for single-family homes followed a normal…

A: The use of standard normal probability distribution tables helps us in ascertaining the percentage…

Q: X is Normally distributed with a mean of 500 and a standard deviation of 40.  What is the…

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Q: A certain dry cereal is packaged in 22​-oz boxes. The machine that fills the boxes is set so​ that,…

A: Obtain the standard Normal Z-score for the random variable X equals 22. The standard Normal Z-score…

Q: DMV Wait Times A state Department of Transportation claims that the mean wait time for various…

A: Given : Sample size , n= 34 Sample mean , X = 10.3 Sample Standard deviation , s = 8

Q: The gestation period of humans follows a normal distribution with a mean of 266 days and a standard…

A:

Q: DMV Wait Times A state Department of Transportation claims that the mean wait time for various…

A: 20. Hey, since there are multiple subparts posted, we will answer first three question. If you want…

Q: A random sample of 81 credit sales in a department store showed an average sale of $75.00. From past…

A: Solution: Let X be the amount of sale. From the given information, n=81, x-bar=$75 and σ=$27.

Q: A light bulb manufacture guarantees that that the mean life of a certain type of light bulb is at…

A:

Q: The process of being served at a bank consists of two independent parts-the time waiting in line and…

A: Expected waiting time in queue =3 mins Expected service time = 5.7 mins The standard deviations are…

Q: The salaries of employees of a certain company in Baguio City have a mean of P6,500 and a standard…

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Q: For a random variable that is normally distributed, with mean of 80 and standard deviation of 10,…

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Q: Traveling between two campuses via shuttle bus takes, on average, 28 minutes with a standard…

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Q: In a large population of adults, the mean IQ is 124 with a standard deviation of 24. Suppose 60…

A: The normal distribution is the most useful theoretical distribution for continuous variables. It is…

Q: A random sample of 36 values is drawn from a mound-shaped and symmetric distribution. The sample…

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

Q: 21 The life of a drill bit has a mean of 16 hours and a standard deviation of 2-6 hours. Assuming a…

A: Given, Mean μ = 16Standard deviation σ = 2.6

Q: A brochure inviting subscriptions for a new diet program states that the participants are expected…

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Q: Sure Stone Tire Company has established that the useful life of a particular brand of its automobile…

A: Mean = 40000 Standard deviation = 5000

Q: A factory produces a certain type of electrical components. Of the total production, 1% is…

A: Given two problems related to binomial distribution and hypothesis testing.  We have to solve as…

Q: When testing a hypothesis about a single mean, if the sample size is 20, the population standard…

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Q: ementary school teachers who are women rn less than their male counterparts. She llects data from…

A: We have given that  Sample size n1= 100    n2= 225 Sample mean M1=57600  , M2= 58800 Standard…

Q: manufacturer of light bulbs that last a mean of 950 hours with a standard deviation of 120 hours.…

A:

Q: Acme Corporation manufactures light bulbs. The CEO claims that an average Acme light bulb lasts 300…

A: Solution-: Given: n=15, \bar{x}=290, s=50 Claim: μ<300 We want to find, P(15 randomly selected…

Q: The expected (mean) life of a particular type of light bulb is 1,000 hours with a standard deviation…

A: Given that, Mean = 1000 Standard deviation = 50

Q: A random sample is selected from a normal population with a mean of μ = 30 and a standard deviation…

A: Solution: a. State the hypotheses. Null hypothesis: That is, there is no significant effect of the…

Q: At the 0.10 level of significance, can it be concluded that this represents a difference from the…

A: Given that Sample size n = 50 Sample mean = 9.2 Population SD = 3.2 Level of significance = 0.10

Q: A energy-generating program is proposed using wind power. Suppose that this form of energy…

A: Given Data Population Mean,μ = 25.0 Population Standard Deviation,σ = 15.0

Q: Manufacturer A's television picture tubes have a mean lifespan of 7.2 years and a standard deviation…

A: A continuous random variable X is said to follow Normal distribution with parameters μ and σ2 if its…

Q: Sure Stone Tire Company has established that the useful life of a particular brand of its automobile…

A:

Q: In a normal distribution with a mean of 72 and a standard deviation of 12:   What percentage of…

A: Given that , mean = μ = 72 standard deviation = σ = 12

Q: An obstetrician read that a newborn baby loses on average 7 ounces in the first two days of his or…

A:

Q: (a) Based on a recent study, the monthly utility bills for three-room flats in Singapore can be…

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Q: Annual precipitation in a certain city is normally distributed with a mean of 99 inches, and a…

A: Given: standard deviation(σ) = 18 inches sample size(n) = 35 population mean(μ) = 99 inches

Q: True or False: If the amount of gasoline purchased per car at a large service station has a…

A: The mean is 15 and the standard deviation is 4.

Q: The average "moviegoer" sees 8.5 movies a year. A moviegoer is defined as a person who sees at least…

A: Given Average =9.9 Sample SD=3.2 n=42 μ=8.5

Q: The consumer board’s alternative hypothesis is:

A: Here use basic of how to define null and alternate hypothesis

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.