Mean and standard deviation of the variable
Determine the mean and standard deviation of the variable x in the binomial distribution where n= 4 and ? = .80
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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.
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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 claim or not.
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 can be expected to travel btwn 65 & 80 thousand
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.
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 machine, assuming an approximate normal distribution.
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
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?
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