5. A sample of 70 fluorescent bulbs is tested to check the hypothesis that the mean life, as claimed by the manufacturer, is at least 15000 hours. If the population standard deviation is 500 hours, can we conclude at 95% confidence that the mean life of the fluorescent bulbs is less than 15000 hours?

Q: how many students must be randomly selected to estimate the mean weekly earnings of students at one…

A: Here we need to find the required sample size with 95% confidence. Given SD=54, Margin of error=5.

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 116 and a standard…

A: Given information Mean = 116 Standard deviation = 14  between 102 and 130

Q: 8.40 If a light bulb manufacturing company wants to estimate, with 95% confidence, the mean life of…

A: Given data,σ=1000E=200z-value at 95% confidence is Zc=1.96n=?

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard…

A: From the provided information, Mean (µ) = 144 Standard deviation (σ) = 27 X~N (144, 27)

Q: Suppose a population has a mean of 100 and a standard deviation of 15. If repeated samples of size…

A: Given: n = 25 σ=15μ=100 The standard deviation of the sample means can be calculated as: σX=σn

Q: Suppose that the heights of adult women in the United States are normally distributed with a mean of…

A: GivenMean(μ)=64.5standard deviation(σ)=2.4

Q: 4. Suppose that in the past years the average price per square foot for warehouses in Subic has been…

A: One sample t-test: The one -sample t -test is used to determine whether the mean of sample differs…

Q: 3. Suppose the mean blood glucose of a population of adults is 162 with a standard deviation σ=58.…

A: Given that, n=36,μ=162σ=58 The mean and standard deviation of sample mean is,

Q: A biologist is interested in studying the effect of vitamin supplements on deer mouse body length.…

A: Note: According to Bartleby, expert solve only one question and rest can be reposted.

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 116 and a standard…

A: From the provided information, Mean (µ) = 116 Standard deviation (σ) = 14 X ~N (116, 14)

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: Suppose a population is known to be normally distributed with a mean, µ, equal to 116 and a standard…

A: We have, Mean μ=116 Standard deviation σ=14 X~N116,14 Now,…

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard…

A:

Q: A researcher wishes to estimate within $5 the average repair cost of for a refrigerator. If she…

A: Population standard deviation is 15.50. The z-critical value for 90% confidence interval is 1.645…

Q: A psychologist believes that it will take at least an hour for certain disturbed children to learn a…

A:

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard…

A: From the provided information,

Q: 2. A researcher is interested in the decrease in adolescent BMI after a new after school program is…

A: Sample size: Sample is the part of the population that will help us to draw the inference about the…

Q: At α=0.10​, can the engineer support the claim that the mean braking distances are different for the…

A: For make A, sample size n1 = 35, sample mean = 40 and population SD = 4.8 For make B, sample size n2…

Q: Suppose that the standard deviation of the tube life for a particular brand of TV picture tube is…

A: It is given that , the standard deviation of the tube life for a particular brand of TV picture tube…

Q: Suppose that the heights of adult women in the United States are normally distributed with a mean of…

A: Let X denote the height of the adult women in the United States. Therefore X~N (64.5,2.5) i.e.…

Q: 1.The mean of a random sample with 25 observations from a normal population with a standard…

A:

Q: 9. Suppose only the top 20 % of marks on a university entrance exam qualifies an application for…

A: Here we can use normal distribution to find the minimum marks to be in top 20%. If x are minimum…

Q: Suppose a population is known to be normally distributed with a mean, equal to 116 and a standard…

A: The percentage of the population would be between 116 and 144 is obtained below:It is given that the…

Q: To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a…

A: Given that  α=0.10That is,α=10%Level of significance =10%

Q: 17. The director of research and development is testing a new medicine. She wants to know if there…

A:

Q: A random sample of size 25 from a normal population has mean 47.5 and standard deviation 8.4. Does…

A: In order to test the claim that the mean of the population is 42.1, conduct a single mean comparison…

Q: 13. Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed…

A:

Q: The Statistical Abstract of the United States reports that the mean daily number of shares traded on…

A: Given Data: x¯=2.1σ=0.5n=36   Null and Alternate Hypothesis H0: μ=2HA: μ≠2

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard…

A: Mean = 144 Standard deviation = 27

Q: 7. For a population with a standard deviation of σ = 20, how large a sample is necessary to have a…

A: Standard deviation: Standard deviation is defined as the positive square root of Variance. It is…

Q: 18. The mean lifetime of a wristwatch is 25 months, with a standard deviation of 5 months. If the…

A: Comment: As per the our company guidelines we are supposed to answer only one question. Kindly…

Q: 5. A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many…

A:

Q: Suppose that the amount of time that takes place for the Bureau of Internal Revenue(BIR) to send…

A:

Q: In 2002, the mean age of an inmate on death-row was 40.7 years, according to data from the US…

A:

Q: In a specific year, SAT scores were Normally distributed with mean 1026 and standard deviation 209;…

A: Solution-: (a) Given: μ=1026,σ=209 We find P(scores will be above 1300)=? (b) Given: μ=1500,σ=250 We…

Q: Suppose that the heights of adult women in the United States are normally distributed with a mean of…

A:

Q: A psychologist believes that it will take at least an hour for certain special child to learn a…

A: Given,sample size(n)=30sample mean(x¯)=50population standard deviation(σ)=15α=0.01

Q: Suppose that water usages in American showers are normally distributed, with an average shower using…

A: We have given that,  X be the random variable from normal distribution with mean (μ) = 16.4 and…

Q: Suppose a random sample of size 49 is drawn from a population with a mean of 275. If 91% of the time…

A:

Q: with a mean of 9.5 years and a standard deviation of 3.4 years. What percentage of workers have…

A:

Q: 4.) Suppose that you want to decide which of the two equally priced brands of light bulbs last…

A:

Q: 2. The owner of a factory that sells a particular bottled fruit juice claims that the average…

A: Given: population mean(μ)=250sample size(n)=100sample mean (x¯)=248standard deviation(σ)=5

Q: o compare the dry braking distances from 30 to 0 miles per hour for two makes of​ automobiles, a…

A:

Q: uppose samples of size 100 are drawn randomly from a population that has a mean of 20 and a standard…

A: Given that, μ=20,σ=5,n=100 The mean and standard deviation of the sampling distribution of sample…

Q: Suppose the distribution of typing speeds in words per minute for experienced typists can be…

A: Solution: Let X be the typing speed in words per minute. From the given information, X follows…

Q: Suppose you have the population 50 and 80 and that their corresponding z-scores are -1 and -2,…

A:

Q: Suppose you could take all samples of size 77 from a population with a mean of 12 and a standard…

A: Given data, Mean μ=12 sd      σ=3.2 n=77 standard deviation of the sample means σx=?

Q: A researcher hypothesizes that the average number of sports that a college offers for males is…

A:

Q: The Statistical Abstract of the United States reports that the mean daily number of shares traded on…

A: "Hello. Since your question has multiple parts, we will solve first question for you. If you want…

Q: IF Suppose an economist wishes to estimate the mean commute time, μ, of all people in the civilian…

A: Given that  Margin of error = E = 5  Standard deviation = σ = 15.1