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An economist wants to estimate the mean income for teh first year work for a college graduate who has had the profound wisdom to take a statistics course. How many such incomes must be found if we want to be 95% confident that the sample mean is within $500 of the true population mean? Assume that a previous study has revealed that for such incomes, =$6250
Wildlife Hummingbirds Selasphorus sasin is the scientific name for what is commonly called "Allen Hummingbird" This beautiful hummingbird lives on the west coast of the United States and is named C.A. Allen
the number of customers at quiet morning bakery is believed to follow a poisson distribution with a mean of 2 customers
If I have unnormal data with n=15, and there are 2 samples. What test do I use? How do I make the data normal if the samples contain zero, b/c it's measuring time?
in a tire factor the quality control inspector examines a randomly chosen sample of 15 tires. when more than one
for a given sample size when we increase the probability of type 1 error the probability of a type 2 error?a. remains
a survey found that womens heights are normally distributed with mean 63.5in and standard deviation 2.5in. a branch of
Develop the hypothesis for a 3x3 factorial design (ANOVA). The experiment revolves around the effect of music and chocolate on words remembered. The first IV is the effect of music with 3 conditions
suppose that in reality 19.12 of u.s. employees play hooky. a poll was taken of 1010 u.s. employees. the employees
Assume that the measurements came from a normal distribution. The variability of the manufacturing process is unknown means the same as the standard deviation is unknown.
A researcher claims that the average age of people who buy lottery tickets is 70. A sample of 30 is selected and their ages are recorded as shown below.
Given the following data from two independent samples, conduct a one-tailed hypothesis test to determine if the first sample mean is larger than the second sample mean, given a 0.05 level of significance.
What probability distribution does n1 alone have? Specify the values of the sample size index and parameter for that distribution
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