A hospital wants to be 95% confident that its error is less than two hours in estimating the average time it takes to complete a surgical procedure. Previous studies indicate that the standard deviation is 4.5 hours. How large a sample must be selecte d?

Q: Obtain the rank correlation co efficient for the following data : X: 68 Y: 62 64 75 50 64 80 75 40 5...

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Q: a die is rolled one time, what is the probabilities of each outcome: a. getting a number greater th...

A: Here  x=Number on the die Rolled One dies is rolled  Die has 6 faces and each has same probability o...

Q: f all participants in a repeated measures research study show roughly the same difference between tr...

A: Hypothesis test is conducted to check the difference. To check mean differences we use either Z or T...

Q: The Gallup Poll interviews 1600 people. Of these, 18% say that they jog regularly. The news report a...

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Q: A local TV station conducted a "Pulse-Poll" about the upcoming mayoral election. Evening news viewer...

A: Explanation: here given the think of station faulty prediction more likely Here based on the above s...

Q: Create a 95% confidence interval for the proportion of U.S. adults who live with one or more chronic...

A: Here Given proportion of Us adults report that they live with one more chronic conditions=P¯=0.45 St...

Q: For a group containing 100 observations, the arithmetic mean and standard deviation are 8 and v10.5....

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Q: Part 1 of 4 (a) What Is the probablity that six or more of them used their phones for guldance on pu...

A: Given : Probability of success,p = 0.57 Number of trials,n = 14

Q: asked to guess the average weight of the six watermelons by taking a random sample without replaceme...

A: Here use sampling distribution without replacement 

Q: Energy consumption: The following table presents the average annual energy expenditures (in dollars)...

A: Given:

Q: 2.70 Bills 1. What percent of fifty-dollar bills were donated to the organization? 27.02 50 ISS 2. W...

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

Q: The ranking of ten students in two subjects A and B are as follows : A: 3 5 4 7 10 2 1 В: 6 4 8 1 2 ...

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Q: If Y is a continuous random variable such that E[(Y –a)²] <o for all a, show that E[(Y – a)²] is min...

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

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Q: lustration 40. Given that: N= 10, Total Variation = E(Y-Y² = 38.92 and Unexplained variation = 2(Y-Y...

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Q: Consider the model y = Bi +x2B2 + x3ß3 +e and suppose that application of least squares to 20 observ...

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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: Answer the following multiple choice questions. You must show some relavent work and/or explanation ...

A: Solution-: Which of the following is not a required condition for one-way ANOVA? (1) The sample size...

Q: Calculate the correct mean and standard deviation.

A: Here use standard deviation and mean formula 

Q: In any two series, where d, and d, represent the deviation from a trial average, 100. Ed,? Ed,? = 43...

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Q: Suppose X has an exponential distribution with mean equal to 14. Determine the following: (a) P(X > ...

A: Given: Let X has an exponential distribution with mean equal to 14.

Q: The area under the curve of the alpha region of a two-tailed Chi-Square has more area on the left ta...

A: Here use basic of chi square test

Q: Pay your bills: In a large sample of customer accounts, a utility company determined that the averag...

A: Given Data : Population Mean,μ = 31 Population Standard Deviation,σ = 5

Q: (c) Find the probability that 8 or more of the flights were on time. The probability that 8 or more ...

A: Let p be the probability that a flight is on time. Given that p = 0.85 Let X denote the number of fl...

Q: 20. Ten students were given tests in English and Mathematics. Their marks are given below : Student ...

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Q: In the previous lessons, you learned of the importance of the mean and the standard deviation. You a...

A: Solution: Given

Q: A certain university has 9 vehicles available for use by faculty and staff. Five of these are vans a...

A:

Q: A lobbyist is trying to estimate the true proportion of US adults that support an upcoming bill. Whi...

A: Givenapproximation of p = 0.5Margin of error(E)=0.01confidence level = 95%

Q: An electronic circuit consists of 5 silicon transistors, 3 silicon diodes, 10 compo- sition resistor...

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Q: A firm has classified its customers in two ways: according to whether the account is overdue and whe...

A: Given that : A 2× 2 contingency table is given.  By using the contingency and basic probability we s...

Q: To estimate µ, the mean salary of full professors at American colleges and universities, you obtain ...

A: We have given that,  Sample mean (x̄) = 73220 , standard deviation (s) = 4400 and sample size (n) = ...

Q: Choose the scatter plot that you would least likely model the relationship using a linear model. Que...

A: Generally,we have two types of correlation. Here option A and option C are the examples of negative ...

Q: I collect a random sample of size n from a population and from the data collected compute a 90% conf...

A: Given: I collect a random sample of size n from a population and from the data collected compute a 9...

Q: What is the critical value t* for a 90% confidence interval when n = 15? 1.645 O b 1.960 1.761

A: Given: n = 15 confidence level, c = 90% = 0.90

Q: When applying one-way analysis of variance (ANOVA), all the following are key assumptions that shoul...

A: Solution.  

Q: Calculate co-efficient of skewness from the following data : Marks above 0 10 20 30 40 50 60 70 80 F...

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Q: O = Let 0, X,, X2,... be RVs. Suppose that, conditional on 0, X1, X2,... are independent and X, is n...

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Q: Here are measurements (in millimeters) of a critical dimension on an SRS of 8 of the more than 200 a...

A: We assume the data is normally distributed. 

Q: 8) On a certain campus (assume it is a large university), people of color make up 20% of the student...

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

Q: Suppose you are incharge of rationing in a State affected by food shortage. The following reports ar...

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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: Let X,.... X, be an IID sample from N(u,, o}) and Y,...., Y, be an IID sample from N(u,, o) and assu...

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Q: The managers of a large company wished to know the percentage of employees who feel "extremely satis...

A: In this case, the manager of the company wants to determine the percentage of employees, who feel “e...

Q: Let X and Y be independent, identically distributed RVs with the stan- dard normal PDF (x) = Find th...

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Q: Example 21. Ten competitors in a beauty contest were ranked by three judges in the following order :...

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Q: The math department at a high school has 9 teachers. 6 females and 3 males. Three of the teachers wi...

A: We  have given that Total number of teacher = 9 Female teacher = 6 Male teacher = 3

Q: dults Conducted by the Financial Industry ts Conducted by the Financial Tndustey Pegulatory Authonit...

A: We have given that  Sample size n =1118 Favorable cases x =626 Sample proportion p^=x/n  =626/1118 =...

Q: 1. A box contains ten $1 bills, five $2 bills, three $5 bills, one $10 bill, and one $100 bill. A pe...

A: Given : Number of 1$ bill=10 Number of 2$ bill=5 Number of 5$ bill=3 Number of 10$ bill=1 Number of ...

Q: Let U be a population of size N. From U, we first select a simple random sampling without replacemen...

A: Given that we are first taking out n1 values from N, The probability for any of the N values to be s...

Q: Q8. X is a normally distributed random variable with unknown µ and a known variance, o. X and s' are...

A: Given,sample size=nsample mean=x¯population standard deviation=σα=1-0.95=0.05α2=0.025