A random variable X denotes the number of consumers in a sample of 300 who favor a particular product over all competitors. What are the possible values of X?
Q: national mean of 11%? Use a = 0.01. (a) What is the level of significance? State the null and…
A: Sample size n = 16 Sample mean = 12.9 Population SD = 5
Q: What are the important properties of a random variable?
A:
Q: About 77% of all female heart transplant patients will survive for at least 3 years. Eighty female…
A: The probability that the sample proportion surviving for at least 3 years will be less than 72% is,
Q: Match each random variable expression with either a correct value or correct description. The alien…
A: Please find the solution below. Thank you
Q: 33% of the Population has 20/20 vision if 70 individuals are selected at random from the Population…
A: Sample size : n = 70P(20/20 vision) : p = 0.33x = Number of people with 20/250 visionMean of X : =…
Q: Research has shown that the daily revenue (in thousands) of small businesses is a random variable X…
A: Solution: Let X be the daily revenue (in thousands) of small business. From the given information, X…
Q: The average time it takes a music producer to complete a recording of a pop song is 53.5 minutes.…
A:
Q: When I am taking a Simple Random Sample, what do I do if say I take 23 samples from a range of 93…
A: The random number table is used to obtain the sample random sample which provides each member of the…
Q: The bad debt ratio for a financial institution is defined to be the dollar value of loans defaulted…
A: (a-1)From the information, given the hypotheses are,That is, there is no evidence to conclude that…
Q: You randomly sample 300 graduating seniors and 40 indicate that they are going straight to graduate…
A:
Q: Magnetic surveying is one technique used by archaeologists to determine anomalies arising from…
A: Consider r be a random variable which follows binomial distribution here indicates the number of…
Q: What is a random variable?
A: A random variable is a variable whose possible values are numerical outcomes of a random phenomenon.…
Q: The percentage of students passing exam is 20% (assume every student takes the test). You randomly…
A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…
Q: A random variable X can takes values 1,2,3 or 4 with probabilities 0.6,0.2,0.15 and 0.05…
A:
Q: Let x be a random variable that represents blood glucose level after a 12-hour fast. Let y be a…
A: Hello thank you for the question, as you have mentioned question number A,B and C, answering only…
Q: Suppose you throw two dice and take the sum as a discrete random variable. Let us assume you take a…
A: When you throw two dices together, each dice will show a number ranging from 1 to 6 on the side…
Q: In the airline business, "on-time" flight arrival is important for connecting flights and general…
A:
Q: How can you determine if a random variable is discrete or continuous?
A: Introduction A variable is a characteristic that is being measured.
Q: Total blood volume (in ml) per body weight (in kg) is important in medical research. For healthy…
A: Given Information: μ = 28 ml/kg Sample size (n) = 7 Population standard deviation (σ) = 4.75…
Q: In the airline business, "on-time" flight arrival is important for connecting flights and general…
A: We have given two samples- For sample 1- Sample size, n1 = 16 Sample mean, x1-bar = 74.9% Standard…
Q: A genetics experiment involves a population of fruit flies consisting of 1 male named Andre and 3…
A: Introduction: There is 1 male- Andre, and 3 females- Barbara, Charlene, and Dana, from among whom, 2…
Q: A box contains 3 green and 2 red balls. Three balls are chosen one after the other. Determine the…
A: It is given that a box contains 3 green and 2 red balls. So, the total number of balls in the box is…
Q: A pair of dice are rolled. Let X be a random variable that denotes the sum of the number of dots…
A: Here Given Pair of dice are rolled So Total Possible number of Outcome=6×6=36
Q: How do you know whether a random variable is continuous or discrete?
A: Discrete variable : It is countable. The discrete variables comes from counting number. It assumes…
Q: In the airline business, "on-time" flight arrival is important for connecting flights and general…
A:
Q: Magnetic surveying is one technique used by archaeologists to determine anomalies arising from…
A: Let, X: magnetic susceptibility reading for a randomly chosen site at an archaeological research…
Q: Give 1 real life situation where the concept of random variables is applicable and construct its…
A: A random variable is a variable whose values depend on outcomes of a random experiment. It is…
Q: 30 days. These are the results for those that responded "yes” “8th graders - 34% 10th graders -48%…
A: A Chi-Square for goodness of fit test is a test used to assess whether the observed data can be…
Q: In which aspects of your life can you associate the ideas of discrete random variables and…
A: [Polling] Exit polls to predict outcome of elections [Experiments] Using sample data from…
Q: In a National Institute on Alcohol Abuse and Alcoholism survey, 33% of American adults said that…
A: Population proportion, p=0.33 Sample size, n=2300 Sample proportion, p^=0.35
Q: An insurance company is studying wheat hal damage claima in a county in Colerado. Arandam sampe f 16…
A:
Q: How to find the mean of the random variable x
A: The mean of the random variable x will depend on the distribution of x. Every distribution has its…
Q: Suppose that Max is a climate change scientist and butterfly enthusiast. In Max's locale, the mean…
A: The distribution is normal and the population standard deviation is unknown so the t distribution…
Q: A couple wishes to have children until they have exactly two female children in their _family.…
A: Negative Binomial distribution : The negative Binomial distribution addressed the number trials…
Q: The table shows the earnings (in thousands of dollars) of a random sample of 11 people with…
A: Here sample size for Bachelor’s is n1= 11 and sample size for Associate’s is n2= 10 degrees of…
Q: Person 1 (X) = 1 hour, z = -0.5 Person 2 (X) = 3 hours, z= 0.5 Person 3 (X) = 4 hours, z= 1 4. Using…
A: The question is about normal dist. Given : Person 1 ( X ) = 1 hr. , z = -0.5 Person 2 ( X ) = 3 hr.…
Q: (a) What is the level of significance? State the null and alternate hypotheses. Will you use a…
A: Sample size n = 7 Population SD = 4.75 Sample mean = (32+26+42+36+30+35+30)/7 = 33
Q: The newspaper in the previous problem decides to increase the size of its random sample of citizens…
A: Given Data: Previous sample size=250 New sample size=500
Q: From the past experience, 60% of the stocks are profitable. What is the probability that 5of the 7…
A:
Step by step
Solved in 2 steps
- Suppose x is a uniform random variable with a = 20 and b = 60. Find the probability that a randomly selected observation exceeds 52Total blood volume (in ml) per body weight (in kg) is important in medical research. For healthy adults, the red blood cell volume mean is about ? = 28 ml/kg.† Red blood cell volume that is too low or too high can indicate a medical problem. Suppose that Roger has had seven blood tests, and the red blood cell volumes were as follows. 32 27 39 36 31 37 31 Let x be a random variable that represents Roger's red blood cell volume. Assume that x has a normal distribution and ? = 4.75. Do the data indicate that Roger's red blood cell volume is different (either way) from ? = 28 ml/kg? Use a 0.01 level of significance. (a) What is the level of significance?State the null and alternate hypotheses. Will you use a left-tailed, right-tailed, or two-tailed test? H0: ? = 28 ml/kg; H1: ? > 28 ml/kg; right-tailed H0: ? ≠ 28 ml/kg; H1: ? = 28 ml/kg; two-tailed H0: ? = 28 ml/kg; H1: ? ≠ 28 ml/kg; two-tailed H0: ? = 28 ml/kg; H1: ? < 28 ml/kg; left-tailed (b) What sampling distribution…Academy for Science, Technology & Maritime Transport Compute the variance of random variable, Y. Y 1 P(Y) 0.25 0.5 0.25 Select one: a. 0.34 b. 0.5 C. 0.25 d. 0.7 Type here to search
- Researchers studying starfish collected two independent random samples of 40 starfish. One sample came from an ocean area in the north, and the other sample came from an ocean area in the south. Of the 40 starfish from the north, 6 were found to be over 8 inches in length. Of the 40 starfish from the south, 11 were found to be over 8 inches in length. Which of the following is the test statistic for the appropriate test to investigate whether there is a difference in proportion of starfish over 8 inches in length in the two ocean areas (north minus south) ? 6−11640+1140√ A 6−110.1540+0.27540√ B 0.15−0.275(0.15)(0.275)(140+140)√ C 0.15−0.275(0.2125)(0.7875)(140+140)√ D 0.15−0.275(0.2125)(0.7875)140+140√A random sample of 100 items is selected from a population of size 350. What is the probability that the sample mean will exceed 200 if the population mean is 195 and the population standard deviation equals 20?a-d
- In a study, it was found that 42.5% of the population drink soda at least once a day. You randomly select 8 people. Let X be the number of people in the sample that drink soda at least once a day.Then X has what distribution?Total blood volume (in ml) per body weight (in kg) is important in medical research. For healthy adults, the red blood cell volume mean is about μ = 28 ml/kg.† Red blood cell volume that is too low or too high can indicate a medical problem. Suppose that Roger has had seven blood tests, and the red blood cell volumes were as follows. 34 26 40 37 28 36 29 Let x be a random variable that represents Roger's red blood cell volume. Assume that x has a normal distribution and σ = 4.75. Do the data indicate that Roger's red blood cell volume is different (either way) from μ = 28 ml/kg? Use a 0.01 level of significance. (b) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. The standard normal, since we assume that x has a normal distribution with known σ.The Student's t, since n is large with unknown σ. The standard normal, since we assume that x has a normal distribution with unknown σ.The Student's t, since we assume that x…How do you describe a discrete random variable?
- You decided to plant roses. The probability that a planted roses seedgerminates is 0.80. You plant nine seeds and let the binomial random variable X denotes the number ofroses seeds that successfully germinate. What is the average number of roses you could expect togerminate? What is the variance and standard deviation of X?nd markers without ink. Assume that the box contains 17 markers: 12 that contain ink and 5 tha ontain ink. A sample of 8 markers is selected and a random variable Y is defined as the number arkers selected which do not have ink. ow many different values are possible for the random variable Y? Part 2Suppose that a random variable X can take the values {0, 1, 2 ,3,4,5,8,9} all with equal probability. Then the standard deviation of X.* Your answer
