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Sampling Distributions The following data represent the running lengths (in minutes) of the winners of the Academy Award for Best Picture for the years 2004-2009.
Consider a normal distribution curve where 90-th percentile is at 13 and the 15-th percentile is at 7. Use this information to find the mean and the standard deviation of the distribution.
An environmental group is interested in studying the effects of engine size (cubic inches) on the gas mileage of cars (mpg). consider the following data collected to determine the effect of engine s
What is the best predicted value for the year 2013? Hint: Find the equation for the best fit line. Explain why your predicted value may turn out much different from the actual value.
What are some examples of two measurement-level (quantitative) variables that are likely to be correlated because they are both changing over time?
Conduct the appropiate hyothesis test using α = 0.01. d) Using your part C hypothesis test, can the Cardinal Machining Company conclude the standard deviation of nail lenghts is less t
What is confidence interval in statistics? Please give an example. Could anyone help me this problem?
Chebyshev's Inequality: For Regular worker, the preparation time for daily work needs 35 minutes/day and with standard deviation 6 minutes. What is the percentage for people to use 25 to 45 minutes
What is the difference between standard normal distribution and t-distribution?
A die with 6 facts but only marked two facets with 1 and rest 4 facets with 2, if we throw this die 60 times, we expect to have 20 tims "1" and 40 times "2". What is the range to have right combinat
In a bivariate regression, which variable is the dependent variable and which one is the independent variable? What does the intercept of a regression tell? What does the slope of a regression tell?
A club with 20 members must choose a three-person executive committee and a five-person social committee.
For a particular card game a standard deck of cards has all of the aces, kings, queens, and jacks removed. Among the 36 cards remaining two cards are chosen simultaneously at random. What is the pro
A binomial experiment, which has the probability of success for one trial p = 0.63, is being observed, and 70 trials are preformed. Binomial probabilities for various outcomes can be computed. Howev
Suppose the random variable X has mean 45 and standard deviation of 15 and the random variable Y has mean 15 and standard deviation 3. What would be the mean and standard deviation of the random var
A trucking company wants to estimate the weight load capacity of a particular brand of their flatbed trucks. In measuring 13 of their trucks the average load capacity was 2646 pounds, with a sample
The 99% confidence interval for the true mean difference between the two means is (2 mpg, 5 mpg). Which of the following statements is the best interpretation of this confidence interval?
Alex computed the p-value of the test statistic while Mike compared the test statistic to the corresponding critical value from the t-Table of Critical Values.
In a physics class Alex and Mike were performing a hypothesis test concerning the mean amount of static electricity in a capacitor. Both students computed the same test statistic but Alex's result w
Michael's teacher informed him that his score of 98 on the last Algebra test corresponded to a z-score of -2.12. Which of the following is the best interpretation of Michael's result?
A Los Vegas slot machine requires 25 cents to play. It gives payouts, per play, based on the following probabilities:
If Jack's job consists of preparing six par 3 greens and four par 5 greens, what is the probability that he will have at least 9 of them cut in the allotted time?
Suppose that a test for Hepatitis C is 98% accurate in that if a person has Hepatitis C, the test will indicate "positive" with 0.98 probability, and if a person does not have Hepatitis C, the test
Assuming that the two groups would have unequal variances, what would be the t-statistic be for the test with the null hypothesis that the means are equal, tested against the alternative hypothesis