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A committee of 2 is chosen at random from a population of 7 men and 8 women. What is the probability that the committee will consist of 1 man and 1 woman? in fraction form
If other factors are held constant, if the Pearsons correlation between X and Y is r = 0.80, then the regression equation will produce more accurate predicition then would be obtained if r = 0.60
What is the research hypothesis? Should you conduct a one- or a two-tailed test? Why Present the five-step model, testing your hypothesis at the .05 level. Whad do you conclude?
A medical research team studied the number of head and neck injuries sustained by hockey players. Of the 319 players who wore a full-faced shield, 195 sustained an injury.
Smith is a weld inspector at a shipyard. He knows from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done will be substandard.
The current necessary to produce a certain level of brightness of a television tube was measured for two different types of glass and three different types of phosphor, resulting in the accompanying
For a continuous random variable X, P(28 ? X ? 68) = 0.2 and P(X > 68) = 0.11. Calculate the following probabilities. (Leave no cells blank - be certain to enter "0" wherever required. Round your
Test the research hypothesis that men use the internet more hours than women, set alpha at .05. Would your decision have been different if alpha were set at .01?
The area under a standard normal density curve with a mean of 0 and standard deviation of 1 is
Assume that the heights of men are normally distributed with a mean of 68.7 inches and a standard deviation of 2.1 inches. If 36 men are randomly selected, find the probability that they have a mean
The average score of all golfers for a particular course has a mean of 78 and a standard deviation of 3.5. Suppose 49 golfers played the course today. Find the probability that the average scoreprob
Suppose that prices of a certain model of new homes are normally distributed with a mean of $150,000. Find the percentage of buyers who paid: less than $146,600 if the standard deviation is $1700.
Scores on a standardized test are normally distributed with a mean of 100 and a standard deviation of 12. An individuals test score is found to be 125. Find the z-score corresponding to this value.
A farmer was interested in determining how many grasshoppers were in his field. He knows that distribution of grasshoppers may not be normally distributed in his field due to growing conditions.
A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a m
A random sample of 144 people is obtained from a population of 5000. The 144 people are asked to sample the caterer's food. Will the distribution of p hat, the sample proportion saying that the food
Although crime rates in the U.S. are generally falling, in the past much has been written about the relative effectiveness of raising the probability of arrest and increasing the average sentence le
A random sample of size n is to be drawn from a population with mean = 700 and standard deviation = 300. What size sample would be necessary in order to ensure a standard error of 10?
Find the probability that a randomly selected college student will take between 2.0 and 4.5 minutes to find a parking spot in the library?
A Statistics professor has observed that for several years, about 13% of the students who initially enroll in his introductory Statistics course withdraw before the end of the semester.
Calculate the actual number of respondents in 2010 that fall in each response category. State hypotheses for the following research question: have beliefs on the origin of human life changed since 200
Determine if the statements below are true or false. For each statement, suggest an alternative wording to make it a true statement.
Use the hotel sample data of 25 days showing the restaurant income and number of rooms occupied. Determine whether the breakfast revenue seems to increase as the number of occupied rooms increases.
Test the hypothesis that 9.575083, 10.55852 & 9.17 are equal. What is the numerator degrees of freedom? What is the denominator degrees of freedom?