The probability that an observation taken from a standard normal population will have a z greater than -3.0 is:
Q: Based on the unit normal table, what is the probability of getting a score greater than Z = +/- 2.0?
A: z=2.0
Q: Find the value of Z from the standard normal table such that the probability between Z and –Z is…
A: We use z distribution table to find the required solution.
Q: standard normal distribution, find the probability of Z>1.28.
A: If µ=0, σ2= then normal variable is called as standard normal variable, denoted by Z.
Q: What percentage of z-scores in the standard normal distribution are greater than z = –1.40?…
A: What percentage of z-scores in the standard normal distribution are greater than z = –1.40 We need…
Q: A study by Hershey's indicated that Americans consumed an average of 12.4 pounds of chocolate per…
A: Given that X~N( μ = 12.4 , ? = 3.9) μ = 12.4 , ? = 3.9 Z-score =( x - μ )/?
Q: Consider the continuous normal random variable, X = {a typical customer’s expenditure at Baby-Toy…
A: Let the typical customer expenditure at Toy store be X. The mean and standard deviation of the…
Q: Consider a normal distribution, what probability is P(Z>0.75)?
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Q: Find the value of Z from the standard normal table such that the probability between Z and –Z is…
A: here given , probability between Z and –Z is 0.9802 so p(-Z <z < Z ) = 0.9802
Q: Given a standard normal distribution (with a mean of 0 and a standard deviation of 1) what is the…
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Q: The probability that an observation taken from a standard normal population will have z greater than…
A: A z-score is a standard score that indicates the number of standard deviations a data value is from…
Q: For a normal distribution, the first quartile corresponds with the 25th percentile. A.) True B.)…
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Q: A veterinary researcher takes an SRS of 60 horses presenting with colic whose average age is 12…
A: Option b is the correct answer.
Q: For a standard normal distribution, the probability of obtaining a z value between –1.8 and 1.1 is…
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Q: For a normal distribution with a mean of u = 30 and o = 10, what is the probability of selecting an…
A: Given : A normal dist. with Mean (μ) = 30 Standard deviation (σ) = 10 Let X be a normal variable…
Q: Suppose that X has a normal distribution with the data value 44.2? If necessary, round to three…
A: Mean()=43Standard deviation()=and data value(X)=44.2
Q: Recall that the foot length of a randomly chosen adult male is a normal random variable with mean…
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Q: 2. If a brisk walk at 4 mph burns an average of 300 cal per hour, find the probability that a person…
A: Given problem Given that If a brisk walk at 4 mph burns an average of 300 cal per hour. Standard…
Q: If z is a standard normal variable, find the probability: P(-0.73 < z < 2.27) Remember to use…
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Q: he probability that less than 324 customers in the sample pay online ii. What is the probability…
A: Given,sample size(n) = 400The proportion (p) of the number of all customers who pay online =…
Q: A study of Sandhill Cranes determines that the distance they travel a day is normally distributed…
A: According to the provided information, Mean (μ) = 267 Standard Deviation (σ) = 86
Q: Suppose you have a normal distribution with mean 16. If you are given a data value of 14, would you…
A: We have to find out z score...
Q: Consider the continuous normal random variable, X = {a typical customer’s expenditure at Baby-Toy…
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Q: Let the random variable Z .10 follow a standard normal ?distribution , What is P(Z > -0.21)
A: To find the probability value, use the standard normal table to find the P(Z>-0.21).
Q: Suppose Z is distributed as a Standard Normal variable. What is the probability that Z is between…
A: We are using standard normal distribution to find this value. Using Excel we use command =…
Q: If Z is distributed as a Standard Normal variable, then what is the probability that Z is between…
A: The standard normal variable Z follows normal distribution with mean 0 and standard deviation 1.
Q: esearcher expects a treatment to produce an increase in the population mean. Assuming a normal…
A: 1. According to the sum, A researcher expects treatment to produce an increase in the population…
Q: What is the probability that an observation taken from a standard normal population will have Z…
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Q: he weight of checked bags for a major airline can be modeled by a normal curve with mean 35.6 pounds…
A: Ans#- Given, the weight of checked bags for a major airline can be modeled by a normal curve with…
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- On the production line the company finds that 85.6% of products are made correctly. You are responsible for quality control and take batches of 30 products from the line and test them. Let X represent the number of products out of 30 that are made correctly. What value(s) of X would cause you to shut down production?For a football game in the National Football League, let y = difference between the number of points scored by the home team and the away team (so y > 0 if the home team wins). Let x bet the predicted difference according to the Las Vegas betting spread. For the 768 NFL games played between 2003 and 2006, output follows. Predictor Coefficient SE Coef T P Constant -0.4022 0.5233 -0.77 0.442 BP 1.0251 0.0824 12.44 0.000 (a) We wish to test the null hypothesis that the Las Vegas predictions are unbiased. This will correspond with ? = 0 and ? = b) Based on the results shown in the table, is there much evidence that the sample fit differs from the model ?y = ? + ?x, with values of alpha and beta above? Why?12. The administrator of a new paralegal program at Seagate Technical College wants to estimate the grade point average (GPA) in the new program. He thought that high school GPA, the verbal score on the Scholastic Aptitude Test (SAT), and the mathematics score on the SAT would be good predictors of paralegal GPA. The data on 9 students are: High School SAT Verbal GPA Student SAT Math Paralegal GPA 3.25 480 410 3.21 2 1.80 290 270 1.68 2.89 420 410 3.58 3.81 500 600 3.92 5 3.13 500 490 3.00 2.81 430 460 2.82 7 2.20 320 490 1.65 8. 2.14 530 480 2.30 2.63 469 440 2.33 Considering the following output. · reg paralegalgpa highschoolgpa satverbal satmath Source df MS Number of obs = F( 3, 5) = 10.33 Model 4.3594607 1.45315357 Prob > F 0.0139 Residual 703628528 .140725706 R-squared 0.8610 Adj R-squared = 0.7776 Total 5.06308922 8. .632886153 Root MSE .37513 paralegalgpa Coef. Std. Err. P>|t| [958 Conf. Interval] t highschoolgpa 1.201374 .295513 4.07 0.010 .4417341 1.961015 satverbal .0016293…
- A regression was run to determine if there is a relationship between hours of study per week (2) and the final exam scores (y). The results of the regression were: y=ax+b a=5.246 b=35.42 r2=0.781456 r=0.884 Use this to predict the final exam score of a student who studies 1.5 hours per week, and please round your answer to a whole number. Hìnt: Help Question Help: ☺ Message instructor Submit Question to searchThe multiple regression describes how the mean value of y is related to the xi independent variables. The parameters ?i are used to describe how the mean value of y changes for a one-unit increase in xi when the other variables are held constant. The given estimated regression equation follows where x1 is the high-school grade point average, x2 is the SAT mathematics score, and y is the final college grade point average. ŷ = −1.38 + 0.0232x1 + 0.00482x2 If the variable x2 is held constant, then only changes in x1 will impact the predicted values of ŷ. Since the coefficient of x1 is positive, for each one-unit increase of x1, the values of ŷ will increase by the value of ?1, where ?1 = . In context, for each one point increase of the high-school grade point average, the final college grade point average will increase by this amount when the SAT mathematics score does not change. If the variable x1 is held constant, then only changes in x2 will impact the predicted values of ŷ. Since the…A regression was run to determine if there is a relationship between hours of tv watched per day (x) and number of sit-ups a person can do (y)
- Which command in R to make a plot of the data and then add the regression line of the two random variables x and y?A teacher gives a reading skills test to a third-grade class of n = 25 at the beginning of the school year. To evaluate the changes that occur during the year, students are tested again at the end of the year. Their test scores showed an average improvement of MD = 12.7 points with s2 = 100. Which variables are described in this scenario and what are their scales of measurement? Which test should you use?13 A regression analysis was performed to determine if there is a relationship between hours of TV watched per day (xx) and number of sit ups a person can do (yy). The results of the regression were: y=ax+b a=-0.681 b=20.487 r2=0.697225 r=-0.835 Use this to predict the number of sit ups a person who watches 10 hours of TV can do, and please round your answer to a whole number.