The time taken by brake discs to overheat on construction equipment is normally distributed with µ=3.1 and ơ=0.4, · If you select a random sample of 64 equipment, there is an 85% chance that the sample mean is less than how many minutes?
Q: A population with µ = 50 and σ = 8 is standardized to create a new distribution with µ = 75 and σ =…
A:
Q: Consider the variable x = time required for a college student to complete a standardized exam.…
A: The proportion of students at this university would be unable to finish in the allotted time when 50…
Q: Assume that females have pulse rates that are normally distributed with a mean of mu equals 74.0
A:
Q: It takes an average of 13.1 minutes for blood to begin clotting after an injury. An EMT wants to see…
A: The population mean or the hypothesized mean is .The sample size is .The sample mean is .The sample…
Q: A person's blood glucose level and diabetes are closely related. Let x be a random variable measured…
A: (a) Obtain the probability that X is more than 60. The probability that is more than 60 is…
Q: You are a researcher studying the lifespan of a certain species of bacteria. A preliminary sample…
A: The provided information are: Population standard deviation σ=4 Margin of error (E) = 0.5 Confidence…
Q: (b) Find the 1oth percentile of x. Round the answer to at least two decimal places. The 10t…
A: Given that. X~N( μ , ?^2 ) μ= 31 , ?=6 ,n=60 Z-score =( x - μ )/?
Q: The lifespan of the Ebola virus on flat dry surfaces has a normal distribution with…
A: The random variable is lifespan of the Ebola virus on flat dry surfaces. The population mean is…
Q: A survey collected data from a random sample of 121 people living in Jade city. The sample average…
A: It is given that the sample mean is 23.28.Using the given information, the standard error of the…
Q: Consider the variable X whose mean and variance are given respectively by Hx = 27.2 and Var(X) =8.…
A: GivenμX=27.2Var(X)=8
Q: Hello. I appreciate any help. Thanks.
A: Standard Error of estimate:S=√MSEMean square error:The formula for the mean square error is,MSE =…
Q: Suppose that the speed at which cars go on the freeway is normally distributed with mean 80 mph and…
A: Let a denotes the fast on the freeway. The fast on the freeway at least 65% of cars travel are,…
Q: A person's blood glucose level and diabetes are closely related. Let x be a random variable measured…
A: NORMAL DISTRIBUTION:- Normal distribution is a continues distribution of data that has the…
Q: It takes an average of 12.6 minutes for blood to begin clotting after an injury. An EMT wants to…
A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…
Q: A person's blood glucose level and diabetes are closely related. Let x be a random variable measured…
A: Since you have posted multiple sub part ,we are only provide the answer of forst three subpart…
Q: 7. Stress levels (measured by cortisol volume) in a certain population are normally distributed and…
A: Given values, μ=200σ=24n=9x¯=180
Q: A population has mean =μ17 and standard deviation =σ18 . Find μx and σx for samples…
A: The given values in the problem are:Population mean (μ) = 17Population standard deviation (σ) =…
Q: A person's blood glucose level and diabetes are closely related. Let x be a random variable measured…
A: Given information: mean, μ=86 Standard deviation, σ=29. a) The probability that x is more than 60…
Q: Arsenic is a chemical element that occurs in many minerals, usually in conjunction with sulfur and…
A: Given Information: Population mean (u) = 8 ppb Sample mean (x) = 7.2 ppb Standard Deviation (s) =1.9…
Q: Unfortunately, arsenic occurs naturally in some ground water.t A mean arsenic level of u= 8.0 parts…
A: We have given that Sample size n=36 ,xbar = 7.1 ,mu=8bbp ,s=2.2 and level of significance =0.01
Q: A person's blood glucose level and diabetes are closely related. Let x be a random variable measured…
A: GivenMean(μ)=84standard deviation(σ)=21
Q: An experiment was conducted to estimate the effect of smoking on the blood pressure of a group of 31…
A: The sample size is 31, sample mean is 9.1 and sample standard deviation is 5.3.
Q: Radon is a colorless, odorless, invisible gas that seeps into residential homes and has been linked…
A: According to the given information in this question First of all we need to know type 1 error, it is…
Q: otal plasma volume is important in determining the required plasma component in blood replacement…
A:
Q: Suppose that the TSH(Thyroid Stimulating Hormone) levels among the healthy individuals are normally…
A: From the provided information, Population mean (µ) = 3.3 units/mL Let population standard deviation…
Q: Find each of the requested values for a population with a mean of 72 and a standard deviation of 10…
A: PX≥85.0=PX-μσ≥85.0-7210=PZ≥1.3=1-PZ<1.3=1-0.9032 Excel function=NORM.S.DIST1.3,TRUE=0.0968
Q: duction of 12 male red-winged blackbirds before and after receiving testosterone implants was…
A: given: d = 0.056 sd = 0.175 probability of 0.8, mean change of 0.01
Q: Dwight wants to estimate the mean calorie content in beets with 90% confidence. He believes that…
A: The population standard deviation, sigma is 17. The z-critical value for the 90% confidence interval…
Q: The random variable X is exponentially distributed, where X represents the waiting time to see a…
A: Denote X as the waiting time during a meteor shower, to observe a shooting star. It is given that X…
Q: A population with µ = 46 and s = 9 is transformed into z-scores. After the transformation, what is…
A: Answer: For the given data,
Q: A population of scores forms a normal distribution with a mean of 180 and a standard deviation of…
A:
Q: A random sample of 46 adult coyotes in a region of northern Minnesota showed the average age to be x…
A:
Q: Question 2 of 9 (i point) A sample of size 190 will be drawn from a population with mean 45 and…
A:
Q: A Christmas tree light has an expected life of 200 hr and a standard deviation of 3 hr. Suppose…
A: Given that μ=200 and σ=3. The distribution of the lifetime of Christmas tree light is unknown.
Q: The ages of people living in a retirement community are normally distributed with a mean age of 68…
A:
Q: The antibody production of 12 male red-winged blackbirds before and after receiving testosterone…
A:
The time taken by brake discs to overheat on construction equipment is
· If you select a random sample of 64 equipment, there is an 85% chance that the sample
Step by step
Solved in 2 steps with 1 images
- The random variable X has a normal distribution with a variance of 16 and an unknown mean. If the probability that the X random variable is greater than 65 is 0.025, which of the following is the average of the random variable?Suppose that the speed at which cars go on the freeway is normally distributed with mean 71 mph and standard deviation 8 miles per hour. Let X be the speed for a randomly selected car. Round all answers to 4 decimal places where possible.69% of all cars travel at least how fast on the freeway?Naini, Cobourne, McDonald and Donaldson (2008) reported that a specific ratio of height to face length of 1 to 8.5 tended to be rated as most attractive—almost exactly what Da Vinci’s idealized Vitruvian Man, predicts as “perfection” in the human form. For this study, we want to see if there is a relationship between a person’s height and head circumference. We get a random sample of 40 people and measure both their height and their head size to the nearest centimeter. What test should you use and why?
- A population with μ = 54 and σ = 12 is standardized to create a new distribution with μ = 100 and σ = 20. After the transformation, an individual receives a new score of X = 95. The original score for this individual was X = 51. True or False?A person's blood glucose level and diabetes are closely related. Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. Suppose that after a 12-hour fast, the random variable x will have a distribution that is approximately normal with mean ? = 84 and standard deviation ? = 25. Note: After 50 years of age, both the mean and standard deviation tend to increase. For an adult (under 50) after a 12-hour fast, find the following probabilities. (Round your answers to four decimal places.) (a) x is more than 60(b) x is less than 110(c) x is between 60 and 110(d) x is greater than 125 (borderline diabetes starts at 125)The EPA recommends avoiding consumption of fish species if the mercury concentration is higher than 0.45 (ug mercury/g uncooked fish). The concentration in a large random sample of marlin was found to be 0.42 ug/g with a margin of error = 0.06 ug/g. Explain whether the EPA should consider marlin a species to avoid for consumption.
- Pyramid Lake is on the Palute Indian Reservation in Nevada. The lake is famous for cutthroat trout. Suppose a tells you that the average length of trout caught in Pyramid Lake Is mu = 19 Inches. Howevera survey reported that of a random sample of 46 fish caught, the mean length was overline x =18.6 lnch , with estimated standard s = 2.7 inches. these data Indicate that the average length of a trout caught in Pyramid Lake less than mu = 19 inches? Use a=0.05 Please answer parts A,B, & CThe National Assessment of Educational Progress (NAEP) includes a mathematical test for eighth-grade students. Scores on the test range from 0 to 500. Suppose that you give the NAEP test to an SRS of 2500 eighth-graders from a large population in which the scores have mean u = 282 and standard deviation o = 110. The mean x will vary if you take repeated samples. Suppose that we took an SRS of 1600 eighth-graders and found x = 285. Compared with an SRS of 2500 eighth-graders, the margin of error for a 95% confidence interval for u is smaller. larger. either smaller or larger, but we can not say which. the same.Unfortunately, arsenic occurs naturally in some ground water.† A mean arsenic level of μ = 8.0 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 31 tests gave a sample mean of x = 6.9 ppb arsenic, with s = 2.4 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use ? = 0.01. (a) What is the level of significance? What is the value of the sample test statistic? (Round your answer to three decimal places.)
- A population of N = 10 scores has a mean of µ = 6. After one score is removed, the mean is found to be M = 5. What is the value of the score that was removed?(a) Compute a 95% CI for u (b) Compute a 99% CI for µ. (c) Which of the two intervals has bigger length, and why?The population mean will always be the same as the mean of all possible X¯ that can be computed from samples of size 21.
