For a population mean of 50, a sample mean of 52, an estimated standard deviation of 3, and a sample size of 20, find the t-obt and the t-crit for a two-tailed test with alpha of 0.05.

Q: In a recent year, the scores for the reading portion of a test were normally distributed, with a…

A: Mean is 20.4 and the standard deviation is 6.5.

Q: A manufacturer of potato chips would like to know whether its bag filling machine works correctly at…

A: Solution: State the hypotheses. Null hypothesis: That is, the bag filling machine works correctly…

Q: A shop owner claims that on average, his shop has a daily turnover of R55000. Test this claim at the…

A: We have given that  Sample size n=68 , xbar=57750, sigma =3250 ,  level of significance =alpha =0.01

Q: A mortgage broker is offering home mortgages at a rate of 9.5%, but the broker is fearful that this…

A: Given Information: Hypothesized value of population mean is 9.5% Sample size n=40 Sample mean…

Q: The piston diameter of a certain hand pump is 0.7 inch. The manager determines that the diameters…

A:

Q: A boat capsized and sank in a lake. Based on an assumption of a mean weight of 140 Ib, the boat was…

A: Given Information; Population mean (u) = 140 lb Sample mean (x) = 173.7 lb Sample size (n) = 50…

Q: A company makes self-sealing stem bolts, which are supposed to average 2.00 cm in length. If the…

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

Q: A random sample of 17 police officers in Brownsville has a mean annual income of $35,800 and a…

A: Denote μ1, μ2 as the true population mean incomes of police officers for Place B and G,…

Q: Sample surveys conducted in a large county in a cer-tain year and again 20 years later showed that…

A: Hypothesis to be tested is:

Q: A sports statiscian claims that the mean winning times for Boston Marathon women's division open…

A: The claim is that “the mean winning times for Boston Marathon women's open division champions is at…

Q: A manufacturer is interested in the output voltage of a power supply used in a PC. Output voltage is…

A:

Q: Q4. Sample surveys conducted in a large country in a certain year and again 20 years later showed…

A: Given information: A survey was conducted to test the average height of ten-year-old boys in a…

Q: a chemist analysis an iron ore for FeO.and obtained value of 12.35% with a standard deviation of…

A: Given:Sample size, n=4Confidence level=95%

Q: A psychologist reports that the average length of R.E.M. sleep in his test subjects was 10 minutes.…

A: Hypothesis Testing: Hypothesis is a procedure by which we can tests an assumption regarding a…

Q: Given a sample mean of 94.3, a sample standard deviation of 8.4 and a sample size of 6, test the…

A:

Q: Find the 90 percent confidence interval for the variance and standard deviation for the time it…

A: Solution :  Given : n = 27             s = 8.9 minutes             α = 0.1 Confidence interval for…

Q: The sample standard deviation for the cost is $

A: The sample standard deviation for the frequency distribution is, s=1n-1∑ifixi-x2 The sums are,…

Q: particular brand of tires claims that its deluxe tire averages at least 50,000 miles before it needs…

A:

Q: If the population standard deviation is sigma= 10, how large  a sample is necessary to have a…

A:

Q: A sample of 20 cans of tomato juice showed a standard deviation of 0.4 ounces. A 95% confidence…

A: we have given that, sample size = 20 standard deviation = 0.4 now, variance= (standard deviation)^2…

Q: Given a sample mean of 83, a sample standard deviation of 12.5, and a sample size of 22, test the…

A:

Q: The average income in Boston is 6200 witha standard deviation of 8000, while the average income in…

A: GivenFor BostonMean(μ)=6200standard deviation(σ)=8000For chicagoMean(μ)=48000standard…

Q: An automatic coffee machine dispenses cups of coffee whose volume per cup varies normally with the…

A: Answer :

Q: Find quartile deviation and its co-efficient from the following data.

A: The quartile deviation is defined as Q.D = (Q3 - Q1)/2 Where Q3 = third quartile and Q1 = first…

Q: The Scottsdale fire department aims to respond to fire calls in 7 minutes or less, on average.…

A: find the attachment for the solution.

Q: In a plant nursery, the owner thinks that the lengths of seedlings in a box sprayed with a new kind…

A: We will conduct a two-tailed test. It is because the estimated mean height of seedlings can depart…

Q: You are interested in testing whether the average age of household heads is higher in the suburbs…

A: Given: For sample 1 (the household heads): Sample size (n1)=45Sample mean(x¯1)=44Standard deviation…

Q: A particular manufacturing design requires a shaft with a diameter of 19.000 ​mm, but shafts with…

A: Given,mean(μ)=19.003standard deviation(σ)=0.004

Q: From a normally distributed population, we took a simple random sample of 700 students with a mean…

A: Given: n=700, x=640, σ=300 and 1-α=90%. Then,1-α=0.9⇒α=0.1   The value of z at α=0.1 is 1.645.

Q: BIG Corporation produces just about everything but is currently interested in the lifetimes of its…

A: Given: Sample Size n=1000Mean x¯=889Standard Deviation s=97

Q: To see if young men ages 8-17 years spend a different amount than the national average of $24.44 per…

A:

Q: For a population with a mean of μ = 75 and a standard deviation of σ = 7, find the z-score…

A: Population mean μ=75, standard deviations σ=7, M=84, n=6

Q: A boat capsized and sank in a lake. Based on an assumption of a mean weight of 137 lb, the boat was…

A: Given that a boat is loaded with 70 passengers. The weights of people are assumed to be normally…

Q: For a population with a means of 72 and a standard deviation of 10 what is the standard error of the…

A: We have given that  Mean=72 Standard deviation=10 Sample size=25 Find the standard error

Q: A boat capsized and sank in a lake. Based on an assumption of a mean weight of 133 Ib, the boat was…

A: Solution

Q: The daily demand for six-packs of Coke at Mr. D’sfollows a normal distribution, with a mean of 120…

A: Given: Let X be the number of six packs ordered daily. Given: X is normally distributed. Mean of X =…

Q: A company advertises that their starting salary for new workers is $50,000.      It is known that…

A: Given: Average(μ)=50,000standard deviation(σ)=8500sample size(n)=36sample mean(x)=52000

Q: An article reported that for a sample of 45 kitchens with gas cooking appliances monitored during a…

A: Confidence Interval - In interval estimation, confidence interval gives amount of error that can be…

Q: A boat capsized and sank in a lake. Based on an assumption of a mean weight of 133 Ib, the boat was…

A: Let X denote the weight of passengers on boat (in lb). (a) We have to find the following probability…

Q: You are interested in testing whether the average age of household heads is higher in the suburbs…

A: From the provided information,

Q: In a left-tailed hypothesis for a population mean where the population standard deviation is…

A: Each hypothesis test has two approaches to maked conclusion about them. The two approaches are p…

Q: A given distribution has a population mean, μ, of 148 and a population standard deviation, σ, of 6.…

A: From the provided information, Mean (µ) = 148 Standard deviation (σ) = 6 X ~N (148, 6)

Q: A manufacturer claims that the light bulbs that they produce have a mean lifetime of 1,200 hours and…

A: It is given that, A manufacturer claims that the light bulbs that they produce have a mean lifetime…

Q: A random sample of 100 observations from a quantitative population produced a sample mean of 28.0…

A: From the provided information, Sample size (n) = 100 Sample mean (x̄) = 28.0 Standard deviation (s)…

Q: A researcher wishes to see if the average number of sick days a worker takes per year is greater…

A: From provided information, claim that the average number of sick days a worker takes per year is…

Q: . For this​ process, what is the proportion of shafts with a diameter between 23.991 mm and 24.000…

A: According to the answering guidelines we can answer only three subparts of a question and the rest…

Q: The inside diameter of a cylindrical tube is a random variable with a mean of 3 inches and a…

A: Random variables are of 2 types, discrete and continuous. A discrete random variable can only take…

Q: A boat capsized and sank in a lake. Based on an assumption of a mean weight of 135 Ib, the boat was…

A: Let 'X' be the random variable representing the weights of people. X~N181.9, 35.1

Q: choose the appropriate hypothesis  a)H0:µ≤ 7 min vsH1:µ> 7 min, Reject Hθ if zcalc> 2.326 b)H0:µ≥…

A: Given : The Scottsdale fire department aims to respond to fire calls in 7 minutes or less, on…