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The probability of concluding that the true mean is less than 59 psi when in fact it is equal to 59 psi is only .05. The probability of concluding that the true mean is less than 59 psi when in fact i
How many students would you need to sample to estimate the true mean score for the class with 90 percent confidence and an error of ± 2?
For a certain class of jet engines, the time until an overhaul is needed, Y (measured in years), varies according to the following probability density function: cye^-y/2, y > 0 fY
Suppose you wish to test the claim that µ < 28.3. given a sample of n = 86 and a significance of 0.05, what criterion would you be used for rejecting the null hypothesis? Assume that the st
The null and alternative hypothesis are given. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed. What peremeter is being tested?
A power of 90% and a two-sided test of size 0.05 are desired. How many patients are needed to detect a difference between true response rates of p1=30% and p2=50%? Let the proportion in group 1 be q
1. A normally distributed population has a mean µ=32 and a standard deviation ?=7. For a set of samples of size 8 taken from this population, about 99.7% of the means will be in what int
Suppose the mean systolic blood pressure in a group of individuals is 150 mmHg, with a standard deviation of 15. Assuming SBP follows a normal distribution in this population, cimpute the following:
Suppose the coach of the football team wants to estimate the proportion of the population of fans who support his current starter lineup. The coach wants the estimate to be .04 of the true proporti
A normally-distributed population has a mean µ=132 and a standard deviation ?=20. For a set of samples of size 60 taken from this population, what is the z-value for the proportion of the samp
Assume that the data has a normal distribution. also assume that the standard deviation of the population, sigma, is known. find the critical value(s) used to test the claim that the mean of the pop
A manufacturer of industrial solvent guarantees its customers that each drum of solvent they ship out contains at least 100 lbs of solvent. Suppose the amount of solvent in each drum is normally dis
A doctor is trying to determine whether her patients prefer a male nurse or a female nurse. After asking 25 male patients, 18 said they would prefer a female nurse. Apply the six steps of hypothes
To test the effect of a physical fitness course on one's physical ability, the number of sit-ups that a person could do in 1 minute, both before and after the course, was recorded.
Suppose that the weights of airline passenger bags are normally distributed with a mean of 47.56 pounds and a standard deviation of 3.08 pounds.
How do you find chi square left and chi square right using the ti-84 plus given that you know the confidence level, sample mean, standard deviation and sample size?
The supplies for the construction of a reinforced concrete building are supplied by the company a and b. The company a offers a 600 truck loads per day, while the company b offers 400 loads.
Construct a 99% confidence interval for the difference between the two population proportions. Assume that the samples are independent and have been randomly selected.
What does this confidence interval suggest about the claim? In general, when dealing with inferences for two population proportions, which two of the following are equivalent: Confidence interval m
In a recent New York City marathon, 25,221 men finished and 253 dropped out. Also, 12,883 women finished and 163 dropped out. We want to use a .01 significance level to test the claim that the rate
If 42% of registered voters in a country are registered democrat, and we select 8 random voters, what is the probability that:
1. What are the assumptions of the simple linear model? 2. Name three assumptions of the ANOVA test?
If we dispute that a baby is premature if the length of pregnancy is in the lowest 4%, find the length that separates premature babies from those who are not premature. Premature babies often requir
Does the sample evidence suggest that calcium concentrations have changed since 1990?