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After collecting psychological data, a regression is performed to relate the Depression Index to Years of Formal Education. The equation is where represents the Depression Index and represents Years
Do women tend to marry men of similar intelligence? Fifty couples were used to investigate this question. A standard IQ test was administered to all subjects. After the exams were graded, the differ
In order to conduct a survey of the US Senate, each senator is assigned a number from 1 to 100 and a computer is then used to randomly select 15 numbers. What type of sampling technique was used?
Test to determine whether the regional distribution for the magazine's subscribers could be the same as the regional distribution for all persons who are 65 or over. Be sure to state your hypotheses
The average weight of NFL players is approximately normally distributed with a mean of 245 pounds and a standard deviation of 25 pounds. What is the probability that a player selected at random will
A study found a strong positive correlation between ice cream consumption and the number of violent crimes committed each month. Some people may take this as an indication of how refined sugars make
Suppose that 64% of the students in Elizabethtown College are female. If 30 etown students are selected at random, what is the probability that fewer than 10 are male?
A test score of 84 was transformed into a standard score of -1.5. If the standard deviation of test scores was 4, what is the mean of the test scores?
What if any assumptions are needed before the t inferential procedure can be used to compare true average elapsed times? Carry out a test of hypotheses to decide whether the true avg difference in ela
An exclusive club for top students has to elect a new President and Treasure. There are 50 students in the club, and all are elegible for election. How many diffrent choices of officers are possible
Sketch the distribution of bob's results, and show graphically ( with numbers added ) how likely he is to finish at least second? How likely is it that an American winds the Gold Medal?
The time between arrivals of large comets on earth is exponentially distributed with a mean of one year. What is the shorterst period of time during which you have at least 90% probability of seeing a
We want to conduct a hypothesis test to see if the true proportion of high school students in Ohio who tried marijuana is now less than 45%. Use alpha = .01. What is the standard error for this test
Does the data provide compelling evidence for concluding that true average power for the Head raquet exceeds that for the Prince power by more than 20 ? Test the appropriate hypotheses using the P-v
To decide whether two different types of tennis raquet have the same true average power, different raquets have been tested. These are the results
A survey of 200 ninth-graders found that 31.5% had used cigarettes in the past week, and a survey of 250 high-school seniors found that 35.2% had used cigarettes in the past week. Is there significa
Let X denote the amount of space occupied by an article placed in a 1-ft^3 packing container. The pdf of the continuous random variable X is
Small Sample Mean Problem. The maker of Mini-Oats Cereal uses an automated packaging machine to pack its 24 ounce box of cereal. At the end of every shift 16 boxes are selected at random and tested
At the end of every shift 16 boxes are selected at random and tested to see if the equipment needs to be readjusted. After one shift, a sample of 16 boxes yielded the following data. mean = 24.33 s
Does the data provide compelling evidence for concluding that true average power for the Head raquet exceeds that for the Prince power by more than 20 ? Test the appropriate hypotheses using the P-
What has requirements about the shape of population? the answer has 15 letters total.
In a Probability class, 45% of the students pass the class, 20% of the students fail the class, and 35% of the students drop the class. Of those passing the class, 80% enjoy the class. What is the
The city council of Pine Bluffs is considering increasing the number of police in an effort to reduce crime. Before making a final decision, the council asked the chief of police to survey other cit
Calculate the odds ratio (X) for the risk between gender and all-cause mortality, when age and race are controlled using the table of data below. Record your answer with two decimal places.