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Help, An experiment is conducted in which 60 participants each fill out a personality test, but not according to the way they see themselves. Instead, 20 are randomly assigned to fill it out according
A city ballot includes a local initiative that would legalize gambling. The issue is hotly contested, and two groups decide to conduct polls to predict the outcome. The local newspaper finds that 53
A May 2007 Gallup Poll found that only 11% of a random sample of 1003 adults approved of attempts to clone a human. Find the margin of error for 95% confidence.
In a poll taken in March of 2007, Gallup asked 1006 national adults whether they were baseball fans. 36% said they were. What is the margin of error for 99% confidence?
In January 2007 Consumer Reports published their study of bacterial contamination of chicken sold in the U.S. They purchased 525 broiler chickens from various kinds of food stores in 23 states and t
The following regression model has been computed based on a sample of twenty observations: = 34.2 + 19.3x. The first observations in the sample for y and x were 300 and 18, respectively. Given this,
Defects Production Rate Per Hour 20 400 30 450 10 350 20 375 30 400 25 400 30 450 20 300 10 300 40 300 Given these sample data, the simple linear regression model for predicting the number of defect
Every Normal model is defined by its parameters: the mean and the standard deviation. Suppose that the mean ?= 20, and that 45% of the area is above 30. What is the standard deviation?
In the Normal model N(100,16) for IQs, what cutoff values bound the middle 80% of all IQs?
In the Normal model N(100,16) for IQs, what cutoff value bounds the highest 5% of all IQs?
The American Veterinary Association claims that the annual cost of medical care for dogs averages $100 with a standard deviation of $30. For cats it averages $120 with a standard deviation of $35.
Given independent random variables with the means and standard deviations below, find the mean and standard deviation of the following random variable: X+2Y
A study of 24 graduates of four-year colleges revealed the mean amount owed by a student in student loans was $14,381. The standard deviation of the sample was $1,892. Construct and explain a 90% co
Two percent (.02) of the items produced by a machine are defective. A random sample of 60 items is selected and checked for defects. What is the probability that the sample will contain 5% or more d
A consumer watchdog agency selects a random sample of 40 taxpayers for further study. A. What is the shape, mean(expected value), and standard deviation of the sampling distribution of the sample me
The number of viewers for the American Idol television show follows a normal distribution with a mean of 29 million and a standard deviation of 5 million. What is the probability that the next week'
What are lurking variables that could be having an effect on the negative linear relationship between car year and car value? Explain their effect.
What are the consequences of making a type II error? What is the probability of making a Type II error if the true population mean is 695 hours?
At a 1% level of significance, does your test show enough evidence to conclude that a significantly lower percentage of accounting firms offer employees flexible scheduling? What is the p-value for
An experiment can result in one or both of events A and B with the probabilities events A and B with the probabilities shown in this probability table:
If the score recorded in the grade book is the total number of points earned on the two parts, what is the expected recorded score E(X + Y)? (Enter your answer to one decimal place.)
If they go back and revise their answers, they start second guessing themselves and end up changing their choice from the correct answer to an incorrect one. For these students, the correlation betw
Tests and measurements, Need answers to questions on test.The file is attached with all the questions would like answers for all of them.