Average of the means
If a population has a standard deviation of 18, what is the minimum number of samples that need to be averaged in order to be 95% confident that the average of the means is within 2 of the true mean?
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With E = event that a traveler on vacation checks work email, C = event that a traveler on vacation uses a cell phone to stay connected, and L = event that a traveler on vacation brought a laptop, use the given information to determine the followi
Consider two components whose lifetimes X and Y are independent and exponentially distributed with parameters lambda_x and lambda_y, respectively. Find the joint pdf of total lifetime X+Y and the proportion of total lifetime X/(X+Y) during which
A rug manufacturer has decided to use 7 compatible colors in her rugs. However, in weaving a rug, only 5 spindles can be used. In advertising, the rug manufacturer wants to indicate the number of different color groupings for sale.
A research study showed that 50% of workers change jobs within 2 years of employment. George took a random sample of 100 new hires at Starbucks during the last 2 years and found that 47 had changed jobs.
One sample is contained in the file labeled THeight. Determine if the process is not producing the tees to specification. Use a significance level of 0.01.
Four separate awards (excellence in academics, excellence in teaching, excellence in departmental service, excellence in outreach) are given to professors in the Department of Mathematics. There are 50 professors. Find the quantity of possible arr
let x denote the number of ticketed airline passengers denied a flight because of overbooking. Suppse that x is a random variable for which p(x)= c(5-x) for x=0,1,2,3,4. Find the numerical value of c and then compute P(x>0).
A group of 5 statistics students receive the following grades on a test: 81, 74, 62, 92, and 76. An intervention plan is used and the students increased their scores on a retest to: 85, 79, 75, 95 and 84. At the 0.05 significance level, is the int
High levels of cholesterol in the blood increase the risk of heart disease. For 14-year-old boys, the distribution of blood cholesterol is approximately Normal with mean ? = 170 milligrams of cholesterol per deciliter of blood (mg/dl) and standar
Your task is to interview a representative sample of attendees to a large concert. The schedule includes 200 live concerts featuring all types of entertainers. Since neither the number of attendees nor their descriptive characteristics are known
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