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A coin was flipped 60 times and came up heads 36 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. (b) Calculate a p-value and interpret it.
A certain firm specializing in the manufacture and sale of free time clothing has 80 retail stores in Florida and 140 in California. With each state as a stratum, the firm wishes to estimate average sick-leave time per employee for the past year
The world's smallest mammal is the bumblebee bat. Shown to the right are weights(in grams) from a sample of those bats. Use the traditional method and significance level of .05 to test the claim that these bats come from the same population having..
If, 20 patients improved, 7 declined, and 3 remained the same, assess whether or not patients undergoing this treatment are showing significant change from baseline to 3 months afterward. Report a p-value.
Does Lavastatin reduce the risk of heart attack? In a Texas Study, researchers gave Lovastatin to 2,325 people, and a inactive substitute to 2,081 people, with an average age of 58. After 5 years, 57 of the lovastatin group suffered a heart attack..
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead.
What are the requirements for applying the hypothesis test for the difference in two population proportions? What are the calculations (computations)?
Research the topic of Job Satisfaction and provide a 1 page write-up of the research highlighting where statistical analysis is being used and why it's used.
If we assume that the errors made by rounding off are iid and have a uniform distribution over the interval ( - ~, ~), compute approximately the probability that the sum of the integers is within two units of the true sum.
Explain probability distribution of X (name and parameters).
Scores on test form normal distribution with mean of µ = 150 and a standard deviation of σ = 25. Mean for sample is M = 158. Compute test statistics (z score) for sample.
What proportion of 330 cci cars fall between 26 to 30 miles per gallon range? Compute the percentage of each of the car models that get 30 or more mpg.
The amount of radioactive element R in grams present t years from now is given by the formula R = 10.9e-0.003t. How much of R is present initially?
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