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A local pizzeria wants to know how much the average cost of an order is during lunchtime on Wednesdays. They collected data from ten orders on Wednesdays (assume their sampling method provides a rep
What is the probability that the male sample will have at most three more days of absences than the female sample?
A random sample of n= 35 observations from a quantitative population produced a mean x=2.4 and a standard deviation s=0.29. Suppose your research objective is to show that the population mean exceed
We therefore expect about 109 cases of such cancer in a group of 299,188 people. Estimate the probability of 97 or fewer cases of such cancer in a group of 299,188 people. What do these results sugg
In a survey of 1116 people, 866 people said that they voted in a recent presidential election, Voting records show that 75% of eligible voters actually did vote. Given that 75% of eligible voters ac
Are X and Y independent? Calculate the cdf and pdf for R, the distance from the origin.
Steve and his friends are relaxing at a local tavern. The number of drinks that Steve's table receives is Poisson distributed with an average of 9 drinks per 3 hours. Write out the distribution and
What conclusion would you draw about the relationship between these two variables if alpha(a) = .05? What conclusion would you draw about the relationship between these two variables if alpha(a) = .10
You want to know if there's an association between college students' spring break destinations and what year they're in. You take a random sample of 405 college students and record the following dat
Suppose that x1, x2, x3, x4, and x5 is a random sample from a distribution with density function: f(x) =1/theta for 0<x<theta. The null hypothesis theta=1 is to be tested against the alternati
Mileage tests were conducted on a randomly sample of 100 new tires. The avg. tread wear was 50000 miles with Standard Deviation of 3500 miles. What is the best estimate of the average tread life in
What is the z score for Indiana University? What is the z score for the University of Evansville?
What is the z score for Indiana University? What is the z score for the University of Evansville? Which school was more expensive to attend in 1995, relative to the cost of education in its own catego
What is the z score for the University of Evansville? Which school was more expensive to attend in 1995, relative to the cost of education in its own category?
The second sample of 40 items were chosen and measured. This second sample had an average response of 132 with a sample variance of 16. What is the pooled standard deviation for this problem? (round
Using past years' data, the population standard deviation can be assumed known as 0.30. What is the 95% confidence interval estimate of the mean undergraduate GPA for students admitted to the top gr
The lengths (in minutes) of a random selection of popular children's animated films are listed below. Estimate the true mean length of all children's animate films with 95% confidence. Assume the va
Compute the Pearson correlation. Do these data provide sufficient evidence for a real relationship in the population? Test at the .05 level, two tails.
Determine the sample size needed to reject Ho if the ratio is 3 times the hypothesized value of 2 variances, alpha = 0.05, beta = 0.10, R=3.
The mean commute time in the US seems to be increasing. The current mean is 25.1 minutes and suppose you know ? = 12. If you are testing at the 1% level of significance, Find the power to find an in
Prior to installing the new system, company analysts determined that the incoming calls to the system are Poisson distributed with a mean equal to two every 10 minute. If this incoming call distribu
An ANOVA table for multiple regression has the required information to compute the coefficient of multiple determination.
To find the sample size needed for a hypothesis test, if Ho: mu=10, Ha: mu<10, sigma is unknown, alpha = 0.01, beta = 0.05 and E = 0.80(sigma), find: