Determine the probability that the score
A normal distribution has mean of µ = 100 with ? = 20. If one score is randomly chosen from this distribution, determine the probability that the score will have value between X = 90 and X = 120?
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Assume X1...Xn is a random sample from normal ditribution with mean u and variance (sigma)^2=2.3. If we wish to find out u with accuarcy of +/-.01 with 95% of confidence, then what is the sample size?
The central limit theorem says if X1...Xn are random sample from unknown distribution with the mean u and variance σ^2, then X(bar) has approximately normal distribution with ( ) mean and ( ) variance if n is sufficiently large.
Compute the function which models total area of four pens. Draw graph af the area function. Compute largest possible total area of four pens.
Assume that you're to plan a survey of starting salaries for recent liberal arts major graduates from Penn State. From a pilot study you estimate that the standard deviation is about $8,000. What sample size do you need to have a margin of error e
The heights of a random sample of 50 college students yielded a sample mean of 174.5 cm, and a sample standard deviation of 6.9cm. Construct 95% UPPER and LOWER confidence intervals for the mean height of college students.
The cards in the well shuffled deck will be turned over one at time till the entire deck has been revealed. Approximate the probability that two cards of same rank (e.g., two sevens or two queens) will be turned over sequentially (e.g., the jack o
Which towns are increasing in size? Which are decreasing? Which town is increasing the fastest? Find annual percent growth rate for that town?
Let test statistic Z have a standard normal distribution when H0 : μ= μ0 is true. Compute the p-value for each of the following situations:
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