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What proportion of the rods has length that is outside the tolerance limits of 5.9 inches to 6.1 inches? To what value does the standard deviation need to be reduced if 99% of the rods must be within
The mean number of patients admitted per day to the emergency room of a small hospital is 0.5. If, on any given day, there are only 7 beds available for new patients, what is the probability that th
Describe how you could determine if the fishing is better at Pyramid Lake from a boat or from the shore by creating either an independent or dependent sampling plan.
A certain typing agency employs two typists. The average number of errors per article is 4.1 when typed by the first typist and 1.5 when typed by the second. If your article is equally likely to be
Cars arriving for gasoline at a Shell station follow a Poisson distribution with a mean of 7 per hour. Determine the probability that over the next hour, only one car will arrive.
Complaints about an Internet brokerage firm occur at a rate of 7 per day. The number of complaints appears to be Poisson distributed. Find the probability that the firm receives 31 or more complaint
Raftelis Financial Consulting reported that the mean quarterly water bill in the united States is 47.50(U.S. News&report , august 12, 2002) Some water systems are operated by public utilities, w
Calculate percentage distribution for the independent variable. Calculate the expected frequency (fe) for this distribution. What is the degree of freedom? What is the Chi-square critical if alpha is
A researcher tests the question of whether participation in community-sponsored services ( such as card games, field trips, etc..) increases the quality of life (as rated from 1 to 10) for older Am
1.What is the standard error sm? 2. What is the value of the t statistic? 3. What is the critical t value? 4. Would you reject or retain the null hypotheses?
A research wants to study the amount of money spent on food among undergraduate students and undergraduate student athletes. Select the following statement that represents the null hypothesis.
We wish to estimate the prevalence of asthma at a large school of 2850 children. We think it will be around 25% and want a sample size that allows the 99% confidence limits to be within 5% of our fi
If a= 0.05 and the direction of the hypothesis is one-tailed and greater than, your critical values for a Z-distribution will be
Let X be a random variable with a continuous uniform distribution on the interval (1,a) where a>1. If E(X)=6Var(X), find a.
The manufacturer of cans of salmon that are supposed to have a net weight of 6 ounces tells you that the net weight is actually a normal random variable with a mean of 5.98 ounces and a standard dev
If a= 0.05 and the direction of the hypothesis is two-tailed, your critical values for a Z-distribution will be?
A researcher wants to know if older adults exposed to community- based, long-term care score higher on the Margolis Scale of Social Activities than do older adults receiving in-home, long-term care.
A simple random sample from a population with a normal distribution of 103 body temperatures has x(bar)= 99.10F and s=0.69F. Construct a 90% confidence interval estimate of the standard deviation of
A researcher conducts a hypothesis test using a sample of n = 20 from an unknown population. What is the df value for the t statistic?
An experiment on the side effects of pain relievers assigned arthritis patients to take one of several over-the-counter pain medications. Of the 445 patients who took one brand of pain reliever, 25
Patty is trying to determine which of two courses to take. If she takes the operations research course, she believes that she has a 10% chance of receiving an A, a 40% chance for a B, and a 50% chan
Find a 95% confidence interval for the difference mean concentration between the shoot and the root.
The figure lists the final grades in Dr. Gooch's entomology class. What percent of the students scored better then C? Round your answer to the nearest integer. Please show work
Is the sampling distribution normal? Why? What is the mean and what is the standard deviation of this sampling distribution. What is the probability that a randomly selected Manhattan apartment has a