Show that for a random sample of size 2 from N (0, ơ²) population, E[Xq„] = - o/Vr.

Q: In an entrance test for admission 900 students appeared. Their average marks were 50 and standard de...

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Q: Carl is conducting a research study and finds a significant positive correlation between a state's p...

A: The correct option is (B). Confounding variable

Q: Calculate combined mean from the following information. Total no. of boys = 50 %3D Mean weight of bo...

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Q: b) The following table shows the time students from a college took to complete a marathon. Time (min...

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Q: From the following information, find the standard deviation of x and y variable: Σχ= 235, Σχ?= 6750,...

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Q: Contrast applied research and basic research.

A: Let AR denote applied research. Let BR denote basic research.  

Q: 13. Determine the type of sampling used in the following scenario: A researcher has a list of names ...

A: Given the scenario :- A researcher has a list of names( In alphabetical order) of her respondents an...

Q: During a period of decline in stock market prices a stock sold at $. 50 per share on one day $. 40 o...

A: Given that : Stock price on 1st day = $50                    Stock price on 2nd day = $40           ...

Q: According to a random sample taken at 12 A.M., body temperatures of healthy adults have a bell-shape...

A: According to the Chebyshev's theorem, 1-(1/k²) of the observation fall within k standard deviation o...

Q: Find the area under the standard normal curve, which lies (a) To the left of Z 0.94 (c) To the right...

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Q: a) In a private school students can choose only of French, Spanish or Music as their Elective. In a ...

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Q: The sample mean calculated from data on the amount spent by 64 customers for lunch at a major Housto...

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Q: Starting at a fixed time, each car entering an intersection is observed to see whether it turns left...

A: We know that  Let X = the number of car observed. For example, for outcome L X takes value 1, for ou...

Q: What do you understand by independence of attributes ? Give a criterion of independence for attribut...

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Q: Find the function U, whose first difference is *C,-

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Q: The monthly salaries (in thousands of dollars) of a sample of 6 sales representatives are as follows...

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Q: The number of workers employed, the mean wage (in $.) per month and standard deviation (in $.) in ea...

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Q: State the null hypothesis; Determine the level of measurement of the variables under study; Choose t...

A: Let X denote the Motivational Behaviour, And Y denote the Science Grade. NOTE : According to our gui...

Q: A variable is normally distributed with mean 18 and standard deviation 5. Use your graphing calculat...

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Q: 6. If the weight of an average passenger vehicle is 4400 pounds, how many short tons is that?

A: Pounds to tons : 1 Pound = 0.0005 tons   2000 pound = 1 tons

Q: Find the average rate of increase in population which in the first decade had increased by 20%, in t...

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Q: SPSS Assignment: Correlations ne following output shows the results of a correlation analysis, exami...

A: Correlation, in the finance and investment industries, is a statistic that measures the degree to wh...

Q: From the data given below, calculate the regression equation taking deviation of items from the mean...

A: Regression Equation = ŷ = bX + a

Q: A box contains 3 white balls and 5 black balls, and all the balls are the same on all sides except f...

A: Given that - A box contains 3 white balls and 5 black balls, and all the balls are the same on all s...

Q: The income distribution of officers of a certain company was found to follow normal distribution. Th...

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Q: taking a statistics class and a biology class. Suppose her probabilities of getting A’s are: P(grad...

A: Given: P(A in statistics) = 0.709 P(A in biology) = 0.766 P(A in statistics and a grade of A in biol...

Q: A discrete random variate x follows Poisson law. Find P(X> 2) and P(X is at most 2), if it is given ...

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Q: Calculate the coefficient of correlation between x and y. 4 6 8. 5 9 13 17

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Q: earson’s product–moment correlation coefficient is represented by the following letter: Group of ans...

A: Question: Pearson’s product-moment correlation coefficient is represented by which letter? Answer: I...

Q: The estimated standard error is a measure of central tendency

A: The estimated standard error is a measure of central tendency :

Q: Explain the importance of recording vital statistics for healthcare policy planning

A: Vital Statistics :The statistics relating to births, deaths, marriages, health, and disease. Vital s...

Q: Suppose a coin has been tossed 20 times. The position of heads (H) and tails (T) obtained in the fol...

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Q: Q7. This is a continuation of Question 6. Late 0.6 Rain II Not Late 0.7 0.7 No Rair Late Which of th...

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Q: In a survey of a group of​ men, the heights in the​ 20-29 age group were normally​ distributed, with...

A: From the provided information, Mean (µ) = 67.2 Standard deviation (σ) = 4.0 X~N (67.2, 4.0)

Q: show that the performance of male college students in Mathematics in terms of final grade is 5% high...

A: Given that  Level of significance=5%=0.05 Find null and alternate hypothesis 

Q: Q. 8. Calculate the mean from the following data: Marks below : 10 20 30 40 50 No. of students : 15 ...

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Q: Problem 18-18 (Algo) A parucular forecasting model was used to forecast a six-month period. Here are...

A: Hai 

Q: 700 and a standard deviation of 100 points. Sammy's score was higher than 93.7% of all participant s...

A: Given:    let x be the score follow normal distribution with mean mu=700 and standard deviations=100...

Q: Calculate Price Index for 1995 and 1996 using 1990 as base year from the following data : Соmmodity ...

A: From the provided information, Commodity Prices ($ per unit)   1990 (P0) 1995 (P1) 1...

Q: question Initially, there were 9 workers, all being paid a uniform wage. Later, 10th worker is added...

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Q: You may need to use the appropriate technology to answer this question. Consider the experimental re...

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Q: The average score on a statistics test was 2.52 with a standard deviation of 0.75. The teacher suspe...

A: Given : E(x) =2.52, SD(x) =0.75 Var(x)=0.752 =0.5625 New score is y=ax+b Such that : E(y) =3.58 SD(y...

Q: For the following scores, X Y 3 11 4 9 1 13 7 2 5 5   Drag blue round points onto the following grap...

A: Steps to draw scatter plot using Excel: In Excel sheet, enter X and Y in different columns. Select ...

Q: The life-time in hours of a certain electrical equipment has the normal distribution with mean - 80 ...

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Q: A popular uprising that started on January 25, 2011, in Egypt led to the 2011 Egyptian Revolution. P...

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Q: A check-cashing service has found that approximately 5% of all checks submitted to the service for c...

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Q: The life-time in hours of a certain electrical equipment has the normal distribution with mean - 80 ...

A: Given that: Mean (m) = 80 standard deviation (s) = 16

Q: (A) Find the standard deviation from the following data using short cut method: Age under 10 30 40 5...

A: The standard deviation for a provided frequency distribution (i.e., the frequency distribution for a...

Q: Let X represent the full length of a certain species of newt. Assume that X has a normal probability...

A:

Q: A competency test is modified so that the proportion of test-takers that pass is more than 75%. A si...

A: Sample proportion is given by