Should we curve? For an exam with a maximum of 100 points, if the class's mean score is 80 and its standard deviation is 20, should we apply the normal curve to adjust grades and assign A to all students with a Z-score of 1 and above? Why or why not?

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Q: jn= 16, α=0.05

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Q: There are 16 components in a non-redundant system. The average reliability of each component is 0.99...

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Q: The heights of young American women, in inches, are approximately Normally distributed with mean uan...

A: We have given that  Population standard deviation =?=2.4. Margin of error =E E=±1 99% confidence int...

Q: A six-sided die is rolled twelve times. What is the probability that the die will show an even numbe...

A: Let p be the probability of getting an even number. Then p = 3/6 = 0.5 Let X denote the number of ti...

Q: The mean number of hours of sleep that a college student gets per night is 6 hours with a standard d...

A: Given data,Mean μ=6sd    σ=3n=20P(X<5)=?

Q: normal distribution with a mean of 72 and a standard deviation of 12 what percentage of cases will f...

A: Given that : Population mean = 72 Standard deviation = 12 X follow standard normal distribution.  p(...

Q: The weights of new born black bear cubs are uniformly distributed with minimum of 245 and maximum of...

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Q: A polling organization announces that the proportion of American voters who favor congressional term...

A: Given  Margin of error=0.03, p=64%=0.64, level of significance=0.05   

Q: 3. ABC hospital with branches in lloilo City and in Bacolod City has developed an improved process f...

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Q: The following frequency distribution shows the number of crimes committed in a sample of 100 urban n...

A: Procedure to construct the Histogram:   EXCEL procedure to plot Histogram:   Go to EXCEL Go to Inse...

Q: Take a guess: A student takes a multiple-choice test that has 11 questions. Each question has five c...

A: Givenn=11p=15q=1-pq=1-15=45A random variable X~Bionomial(n=11 , p=15)P(X=x)=11x15x4511-x  ;   x=0,1,...

Q: Words:O QUESTION 3 In a consumer reports article, the magazine reported that 207 of 316 chicken brea...

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Q: 2. In an attempt to reduce the number of man-hours lost as a result of hospital accidents, a large h...

A: We have given that data  Sample size n =5 NOTE:- According to bartleby guidelines expert can solve m...

Q: 4. Suppose the variance of X is 2.0091. Which of the following is(are) TRUE? I. In the long run, the...

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Q: In 2013, Steve LeCompte, a stock market trader and analyst, did a study to see which TV personalitie...

A: We have given that  Sample size n =678 Favorable cases x =320 Sample proportion p^=x/n  =320/678 =0....

Q: From the following data compute the value of harmonic mean: Class interval 10-20 20-30 30-40 40-50 5...

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Q: 4.17 The length of time required by students to complete a one-hour exam is a random variable with a...

A: Given that ;  A probability density function is given. By using the  properties of continues random ...

Q: Why is the null hypothesis for regression usually B 0?

A: The null hypothesis for regression usually β=0

Q: Men's heights are normally distributed with a mean of 68.4 in and standard deviation of 2.6 in. Use ...

A: Let X be the random variable from Normal distribution with mean (μ) = 68.4 and standard deviation (σ...

Q: 2. A scrap metal dealer claims that the mean of his cash sales is "no more than $80," but an Interna...

A: Given that: Population mean(u) = $ 80 Sample mean = $ 91 SAMPLE standard deviation = $21 Sample size...

Q: Assume that the life of a roller bearing follows a Weibull distribution with parameters β = 2 and δ ...

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Q: (c) Find the probability that all four tires have low air pressure. The probability that all four ti...

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Q: Date losing Price for AMZI Monthly Return for AMZN Closing Price for BAC Monthly Return for BAC Clos...

A: In the given case we are required to determine the percentage of increase or decrease in the price o...

Q: c) Assume this is a simple random sample of U.S. women. Use the Empirical Method to estimate the pro...

A: Given that: X represents no. Of children  f represents no. Of women  A frequency table is given by u...

Q: Rahmat Pasta Sdn. Bhd. is a company that specializes in producing healthy pasta for kids in Malaysia...

A: Question: Let us first formulate the equations Let x,y,z be the number of boxes of Simple Dimple Pas...

Q: Here are measurements (in millimeters) of a critical dimension on an known to be normally distribute...

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Q: A poll conducted in 2013 found that 52% of U.S. adult Twitter users get at least some news on Twitte...

A: at first construct the 99% confidence interval.........

Q: Do you find any association between the temperaments of brothers and sisters from the following data...

A: Yule's coefficient is used to measure the association between the two categorical variable. It used ...

Q: Consider the random variable X that represents the number of people who are hospualized or died in a...

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Q: A lab supply company sells pieces of Douglas fir 4 inches long and 1.5 inches square for force exper...

A: It is given that Population SD = 2000 Margin of error E = 500 The critical value of Z at 90% confide...

Q: The following data relate to the sales, in a time of trade depression of a certain article in wide d...

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Q: In most judicial systems, a defendant is innocent until proven guilty. An attorney defends the null ...

A: The hypothesis test, will contain two hypotheses: null hypothesis and alternate hypothesis. The alte...

Q: The government claims that students earn a mean of $4500 during their summer break from studies tand...

A: Given : Confidence level = 95% Confidence interval : $3525 < μ < $4425 To interpret confidence...

Q: a. P(X < 0.25) b. P(0.25 < X < 0.75) c. Mean and variance

A: Suppose that x has a beta distribution with parameters α = 2.5 and β = 1.

Q: Example 23. A distribution x1, X2,..., Xp.., Xp with frequencies, fp f2,..., f..., fn is transformed...

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Q: Suppose that a random sample of eleven recently sold houses In a certaln city has a mean sales price...

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Q: Look Back and Reflect Explain the usefulness of the Central Limit Theorem in solving problems involv...

A:   As per the Bartleby guildlines we have to solve first question and rest can be reposted individual...

Q: How much "error" is too much before you are no longer confident about your estimates or research fin...

A: Given information: Margin of error is defined as the half the width of the confidence interval. 

Q: Determine if the following data is approximately normal using the Pearson coefficient of skewness. 2...

A: The coefficient of skewness is used to measure whether the distribution is skewed. There are two met...

Q: Cynthia is planning a party. For entertainment, she has designed a game that involves spinning two s...

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Q: What is an important difference between correlation and causation? Which is harder to establish, and...

A: We have to tell about the difference between correlation and the causation. Correlation : statistica...

Q: Example 2.17 Let X be a continuous type random variable with PDF given as 1 f(x) = /27 Let Y be anot...

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Q: For numbers 2 to 4: Below is the probability distribution of the number of calls received by a switc...

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Q: The number of fully formed apples on 100 plants were counted with following results: Plants had appl...

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Q: Example 2.19 Let X be a random variable with possible values (r1, x2, ..Xn) such that P(X = x) =v i....

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Q: Q1. The random variable X has an unknown mean but known variance of 8 i.e. X~N (μ, 8). A random samp...

A: Given  X~N(μ,σ2=16), n=16, x̄=7, sample variance=S2=11  

Q: Consider the hypothesis test below, with n= 65 and p = 0.46. Ho: p= 0.38 HA:p#0.38 a = 0.05 a. State...

A: given;the hypothesis test below, with n=65 and p¯=0.46H0: p=0.38HA:p≠0.38α=0.05

Q: Three ballpoint pens are selected at random from a box that contains 2 blue pens, 2 red pens, and 2 ...

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Q: A newspaper conducted a statewide survey concerning the 2008 race for state senator. The newspaper t...

A: What condition is not required to be met in order to construct a confidence interval for p ?