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Nurses wondered if birth weights of babies are going up. They knew what the average birth weight of a baby last year was 7.6 pound. A random sample of 65 weights of babies at the hospital where the
A coach uses a new technique in training middle distance runners. The times for 8 different athletes to run 800 meters before and after this training are shown below (in seconds).
The data below represents the overall miles per gallon of 2008 SUV's priced under $30,000. Complete parts A & B 24 18 19 20 17 18 18 18 19 19 17 17 20 18 19 17 18 17 17 19 16 21 (A) Construct a
Describe a scenario where you believe a binomial distribution would be appropriate. Describe a scenario where you believe a geometric distribution would be appropriate. Explain your reasoning for bo
Liste below are the heights of fathers and sons. Find the value of r, and use a significance level of 5% to determine whether there is a significant linear correlation between the heights of fathers
Consider the following problem: A top NHL hockey player scores on 93% of his shots in a shooting competition. What is the probability that the player will not miss the goal until his 20th try?
What does R^2=.686 tell us about the variation about the regression line? What is an advantage of being able to determine the height of a tree from its circumfrence?
Describe a scenario where you believe a binomial distribution would be appropriate. Describe a scenario where you believe a geometric distribution would be appropriate.
Suppose that a tax increase is being proposed for a large city in order to support the public school system. Further suppose that 55% of the city's population is in favor of the tax, and 45% of the
An insurance company offers a policy for a $100,000 in the case of death during a calendar year for its young customers. The cost of the policy is $250. If a young customer does not survive a calend
Determine the average number of students in the queue and the average number of students in the system. Determine the average waiting time in the queue and the average total time in the system for a s
Use the sample data to construct an 80% confidence interval for the mean difference in confidence between the control group and the workshop conditions.
The U.S. Post Office is interested in estimating the mean weight of packages shipped using the overnight service. They plan to sample 300 packages. A pilot sample taken last year showed that the sta
How old are college students? The national age distribution for college students is shown below. National Age Distribution for College Students Age Under 26 26-35 36-45 46-55 Over 55 Clients 39% 25%
Given that for a set of data we find that the coefficient of determination r^2r2= 0.75, then how much variation is unexplained by the by the corresponding variation in x and the least-squares line e
What percentage of gym memberships are first purchased in the month of January? A patron purchases a membership in January. What is the probability it is a year-long membership?
The manager of a youth-oriented clothing store at the local mall has determined that 27% of the males who enter the store make a purchase, while 64% of the females who enter the store make a purchas
Perform the appropriate test of hypothesis to determine whether there is a significant difference in time to completion of medical school between women and men.
Assume that the population standard deviations are equal for income mutual funds and growth mutual funds. Use the following sample data to test whether there is a difference in the mean yields
What is the appropriate rejection region associated with the following significance level 0.1. A. Reject H0 if z > 2.575 B. Reject H0 if z > 1.645 C. Reject H0 if z > 1.28 D. Reject H0 if z
A professor of mathematics refutes the claim that the average student spends 4.5 hours studying for the final comprehensive exam. To test the claim, the hypothesis:H0:mu=4.5 vs. Ha: mu not equal 4.
Assuming all conditions are met, test the claim that there is a difference in mean assembly time for each machine using a 3% level of significance. Use the P-value approach.
To test the effectiveness of a new drug designed to relieve pain, 250 patients were randomly selected and divided into two equal groups. One group of 125 patients was given a pill containing the dru
Poker is back. It is so popular that the internet is loaded with on-line poker sites. Johnny C. is a poker enthusiast who believes that a certain on-line site is manipulating the probabilities to en
An agricultural researcher plants 25 plots with a new variety of yellow corn. The yield per acre for the new variety of yellow corn follows a normal distribution with unknown mean of ? and a standar