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Construct a 95% confidence interval for the difference between the two means, and interpre the result, and answer the original research question.
Explain when you would use the Hypergeometric Probability Distribution rather than the Binomial Probability Distribution in solving a probability problem.
Explain the distinction between "at least" 3 out of 5 vs. "at most" 3 out of 5. Identify other terminology or expressions which are analogous to "at least", and other terminology or expressions whic
A hypothesis test is performed to determine if the additional training was effective in lowering the defect rate. Suppose the P-value associated with the test statistic is 0.0594. For a=.01, what is
How did genres such as chamber music (often written for a small number of amateur performers) and the symphony (performed for large public audiences) begin to provide composers with new degree of fi
You have determined that your cutoff value at a level a=0.05 is 1.645 when testing whether the mean of a population is significantly different from 1.5. if you calculate a test statistic of 1.8 what
If quality control inspectors wish to estimate the % cacao to within 1% of the true mean with 95% confidence, how many pieces of chocolate should they sample?
How do U.S. residents who travel overseas for leisure differ from those who travel for business? The table is a breakdown by occupation. Explain why we cannot use the chi-square test to determine if
There is no evidence that the age distribution of Red Lake is different than that of Canada (P=0.81). There is very strong evidence that the age distribution of Red Lake is different than that of Cana
Based on information from the Rocky Mountain News, a random sample of 12 winter days in Denver gave a mean pollution index of 43 with a standard deviation of 21. For Englewood (a suburb of Denver),
A linear regression was done to relate systolic blood pressure to weight (measured in pounds). The resulting regression equation was where represents systolic blood pressure and represents weight.
If you take the within groups sum of squares and divide it by the between groups degrees of freedom, you get:
Using these results, test the null hypothesis of no difference between college-bound and non-college bound high school students with respect to smoking. What does the outcome of this test indicate?
Scores on an exam follow an approximately Normal distribution with a mean of 76.4 and a standard deviation of 6.1 points. What is the minimum score you would need to be in the top 4%?
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