Explain the difference between an observational study and an experiment. Give the description of a real-word example of each of these types of studies. Explain the purpose of blinding (single or double) in experimental studies using an example.

Q: If a machine is correctly set-up it produces 90% acceptable items, if it is incorrectly setup it pro...

A: Given that, If a machine is correctly set-up it produces 90% acceptable items, if it is incorrectly ...

Q: A survey of 36 men found that an average amount spent on St. Patrick's day of $99 with a standard de...

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Q: Problem : Determine the MTTF for a mission time of 1000 hours life if the test data on 10 such compo...

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Q: Medical researchers have developed a new artificial heart constructed primarily of titanium and plas...

A: The hypotheses for the test is given below. Null hypothesis: H0: µ =10 hours Alternative hypothesis:...

Q: A group of people were asked if they had run a red light in the last year. 455 responded "yes", and ...

A: The number of people who responded yes is 455 and the number of people who responded no is 310.

Q: In an inter-school competition, there are a total of 14 participants. Each participant answered 20 m...

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Q: A coach uses a new technique to train gymnasts. 7 gymnasts were randomly selected and their competit...

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Q: Problem : The life testing data of 1000 specimens of a particular device are given below. Determine ...

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Q: Suppose that {X,:n 2 0} is a finite Markov chain with the state space S= {1,.., M}, when M is a posi...

A: @solution::::    

Q: Consider the hypotheses below. Ho: H2 75 H1:µ<75 Given that x = 69.7, s = 9.9, n= 20, and a = 0.10, ...

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Q: swer this one instead. A nationwide study of American homeowners revealed that 64% have one or more...

A: Given: Sample size (n) = 490 Number of success (x) = 360 Sample proportion p^=360490=3649 Hypothesiz...

Q: a sample is selected from a normal population with μ=200 and σ=20 and that sample has a mean of M = ...

A: Given that  The normal distribution with  Population mean (μ) = 200 Standard deviation (σ) = 20 Samp...

Q: An American roulette wheel has 38 slots: two slots are numbered 0 and 00, and the remaining slots ar...

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Q: The variance of a binomial distribution cannot exceed n/4. Or Let x be a binomially distributed rand...

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Q: The 2008 General Social Survey asked, “What do you think is the ideal number of children for a famil...

A: We have given that  Sample size n =678 Sample mean =3.22 Standard deviation =1.99

Q: Prove convexity of the following:  the risk function of portfolio x, Risk(x) := E[R(x)] + δE[|R(x)...

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Q: dents passed a test in wnich the top three will get a prize. How many posSible ways are there to get...

A: Given that : Total student passed a test (n) =  10 Student get a prize (r) = 3 By using permutations...

Q: It is known that 60% of customers will need additional maintenance on their vehicle when coming in f...

A: We have given that  Sample size n =50 Sample proportion p^=60%=0.60

Q: One of the tallest living men has a height of 250 cm. One of the tallest living women is 232 cm tall...

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Q: Rankings of 10 trainees at the beginning (x) and at the end (y) of a certain course are given below:...

A: Spearman rank correlation is a measure which used to measure the association between the ranked vari...

Q: 3. X · P(X) (X – 4)? (х — и)2 . Р(X) X P(X) 1 0.11 0.40 7 0.30 10 0.19

A: According our policy we can answer only first question for remaining please repost the question. 

Q: If the power for a hypothesis test is calculated to be 0.90, then for the same test, the probability...

A: Given  Power=0.90

Q: Problem : Four units are connected in series with independent performance. The probabilities are as ...

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Q: Use the spinner below. 12 1 11 2 10 3 9 4 5 7 6 P(less than 12) =

A: The spinner is equally divided in 12 parts.

Q: Let the random variable Y possess a uniform distribution on the interval (0, a). a. Use the transfor...

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Q: Per person, $4,064 was the average yearly Medicare Hospital Insurance benefit in a recent year. If t...

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Q: 1.) What is the theoretical probability that an even number will be rolled on a number cube? Number ...

A: A probability of an event is calculated by dividing the favorable outcomes (k) with the total possib...

Q: 49. It is estimated that 63% of Americans will watch the Masters golf tournament and only 48% will w...

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Q: adrian has 5 keys on a key chain and one of the keys is used to unlock his office door. if adrian lo...

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Q: 2. At the repair department of a store that sells electric appliances, there are currently six TV se...

A: Number of possible arrangement of data. It can be broadly divided into two methods, they are permuta...

Q: If all possible random samples of size =45 are selected from a population with μ=69 and a σ=6, and t...

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Q: Determine the variance of the measurement data obtained in the two laboratories. B. Is there any sig...

A: Given: Lab 1 0.470 0.484 0.463 0.449 0.482 0.454 0.477 0.409 Lab 2 0.529 0.490 0.489 0.512 0.48...

Q: How many 5-digit numbers can be formed using the digits 0 to 9 if repetitions are allowed?

A: Total number of digits allowed are : 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,  

Q: 45 If the probability of an event is Write your answer as a simplified fraction. ,what is the probab...

A: Ans#- If the probability of an event is  4573            what is the probability of the event not ha...

Q: Consider the data. 12 6 20 X; 14 55 35 60 10 25 The estimated regression equation for these data is ...

A: For the given data ( a ) SSE = ? SST = ? SSR = ? ( b ) r^2 =? ( c ) r = ?

Q: A sample of 503 school teachers, who are married, showed that 210 of them hold a second job to suppl...

A: Given Data n1 = 503 x1 = 210 n2 = 383 x2 = 141

Q: lQ. 10. Find out mean deviation and its co-efficients. (a) Mean, and (b) median from the below given...

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Q: The physical plant at the main campus of a large state university recieves daily requests to replace...

A: Empirical rule  P(-3σ+μ&lt;X+3σ+μ)=99.73%  P(-2σ+μ&lt;X+2σ+μ)=95% P(-σ+μ&lt;X+σ+μ)=68%     

Q: Let L be a r.v: P(L <= 0) = 90%, P(L = 10) = 5%, P(L = 20) = 5%. Find VaR95%(L) and VaR95.1%(L). Exp...

A: Given the probabilities of the random variable L as PL≤0=90% PL=10=5% PL=20=5%

Q: The length of time that a student takes to complete her homework is uniformly distributed between 3 ...

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Q: A market research firm is interested in surveying certain attitudes in a small community. There are ...

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Q: Over the past several months, an adult patient has been treated for tetany (severe muscle spasms). T...

A: a) Step-by-step procedure to find the mean and standard deviation using TI-84 calculator:  Enter ST...

Q: Calculate the average rates of change from 2000 to 2009 and from 2009 to 2015. Round each result to ...

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Q: Refer to Table 1. What is the probability that an undergraduate business major intends to attend cla...

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Q: You have been asked to determine the average amount that fishermen spend per year on food and lodgin...

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Q: In two sets of variables x and y with 40 observationş each the following data were observed: Mean x ...

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Q: A ball is drawn randomly from a jar that contains 7 red balls, 4 white balls, and 9 yellow balls. Fi...

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Q: Consider four possible combinations of sample size and treatment assignment rules. n=50, treatment ...

A:   Decision based Confidence interval: If zero includes in the confidence interval, we fail to rejec...

Q: In the probability distribution to the right, the random variable X represents the number of marriag...

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Q: A As shown above, a classic deck of cards is made up of 52 cards, 26 are black, 26 are red. Each col...

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