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Consider the following joint probability density function of the random variables x and y: f(x,y)= 3x-y/9 for 1<x<3 and 1<y<2
Assume that adults have IQ scores that are normally distributed with a mean of u= 100 and a standard deviation = 20. Find the probablility that a randomly selected adult has an IQ less than 140.
An insurance company receives an average of 100 claims per month and each claim results in a payment (independently of the others) with probability 0.95. Let X be the number of payments and Y the nu
Set up the hypotheses for the test to determine if there is enough evidence to suggest the actual mean content differs from the stated value. Use appropriate symbols. Calculate the value of the test
The following table gives classifications on gender and salary of 1000 employees at a company. Use this information.
The student newspaper called Campus Press polled a simple random sample of 280 undergraduate students in order to study student attitude toward a proposed change in dormitory regulations.
A publisher wants to estimate the mean length of time (in minutes) all adults spend reading newspapers online. To determine this estimate, the publisher takes a random sample of 15 people and obtain
You compute a correlation coefficient that equals +.25. Given this, what is the value for the explained variance?
Find the largest number of room reservations that this hotel can book and still be at least 95% sure that everyone who shows up at the hotel will have a room on a given night.
In a study comparing four levels of Factor A and two levels of Factor B, with six observations in each cell, the SSE=3456 and the SSA= 364. What is the value of the F statistic that is used to test
The following list is a sampling of the costs of various statistics textbooks used at several colleges. Give the upper confidence limit for a 95% confidence interval estimate for the mean cost of al
Using a 0.05 level of significance, what is the critical point for this test? Give your answer to four decimal places. What is the appropriate conclusion?
Question: a. is this significant evidence of a difference between the age distribution of jurors and the countywide age distribution? b. does there appear to be an age bias in the selection of juror
Compare the discoloration in the control group to the average in the three experimental groups, as a group. State your conclusion.
Based on a study of heights of men and women who played basketball, a researcher concludes that the exercise from playing basketballcauses people to grow taller. do you agree with this conclusion.
Given that the hotel books the number of reservation found in part a, find the propability that at most 80% of the available rooms will be occupied on a given night.
The evning weather report says there is a 30% chance of rain tomorrow. When it is raining, John takes the bus to work half of the time and drives his car half of the time. When it is not raining, Jo
Indentify the claim and state the hypothesis (null and alternate). Find the critical value. Find the standardized test statistic, z
Write the null and alternative hypothesis: What is the significance level? Solve for z value. Write the decision rule
What is the value of the point estimate of the proportion of Greeks who would rate their lives poorly enough to be considered "suffering"?
An urn contains 8 red and 12 white balls. Draw one ball at random from the urn. Let X = 1 if a red ball is drawn and X = -1 if a white ball is drawn. Compute the variance of X.
Approximately 23% of the calls to an airline reservation phone line result in a reservation being made.
A distribution with m=35 and a standard deviation = 8 is being standardized so that the new mean and standard deviation will be m= 50 and standard deviation = 10. In the new, standardized distributi
A researcher tests whether levels of education and income levels are related. In this study, he observes the following frequencies. If he computes a chi-square test for independence at a .05 level o