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Construct a 98% Confidence Interval for the difference of the proportion between the drug group and the placebo group. Using a significance level of .01, test the claim that the drug is effective us
For a two tailed hypothesis test of a difference of means with α=.05 and df=30, we have the following critical values:
For a hypothesis test of a difference of means with n1=35 and n2=45, what is the value for the degrees of freedom, df?
We estimate the mean price of a cell phone in the Bay Area using a 95% level of confidence. From a random sample of 25 stores the mean price was found to be $150 with a standard deviation of $15
A sample of pieces is taken and the diameters are 1.01, 0.97, 1.03, 1.04, 0.99, 0.98, 0.99, 1.01, and 1.03 centimeters. Find a 99% confidence interval for the mean diameter of pieces from this machi
A UCLA researcher claims that the life span of mice can be extended by as much as 25% when the calories in their food are reduced by approximately 40% from the time they are weaned.
Determine the mean and standard deviation of the variable x in the binomial distribution where n= 4 and ? = .80
A trucking company determined that the distance traveled per truck per year is normally distributed with a mean of 80,000 miles and a standard deviation of 12,000 miles. What proportion of trucks ca
Construct a 95% confidence interval for the population proportion. e. Explain what this confidence interval means. f. By performing the hypothesis test, determine if the survey results support the cla
Draw a tree diagram representing the outcomes of flipping 3 coins with replacement between the flips. List the sample space.
A student is required to take college algebra before taking stats. But not all students are required to take stats. Draw a tree diagram depicting taking algebra and taking statistics.
Three coins are placed in a box. A quarter, a dime and a nickel. One coin is drawn at random and not replaced. A second coin is drawn at random and is replaced.
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