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Electricity bills in a certain city have mean $124.73. Assume the bills are normally distributed with standard deviation $18.71. Find the value that separate the lower 44% of the bills from the rest.
1. the quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of
How large should the sample size be if she wishes to be accurate within $0.10. A previous study showed that the standard deviation of the price was $.12.
according to the us department of agriculture the annual amount of apples eaten by a randomly chosen woman is normally
Determine the covariance matrix for values of this process at time t=1,2,3,4. Determine its inverse(numerically) and write formula for pdf of corresponding random vector.
A video rental store has two video cameras available for customers to rent. Historically, demand for cameras has followed this distribution:
Find and interpret the multiple index of determination
Given what you've learned in this module about the meaning of "statistics", choose one of the examples from Part I (A-F), and raise a relevant question of your own that could be answered by a statistician.
question a psychologist is examining the educational advantages of a preschool program and suspects that there will be
Exercise values are in kilocalories of physical activity per week. Use a 0.05 significance level to test the claim that the level of smoking is independent of the level of exercise.
Draw a picture of the distribution of these verbal SAT scores, indicating the cutoff points for the middle 68%, 95%, and 99.7% of the scores.
1) The owner of a professional basketball team claims that the mean attendance at games is over 25,000 and therefore the team needs a new arena. Determine whether the hypothesis test for this claim is left-tailed, right-tailed, or two-tailed.
The numbers of years served by selected past members of the U.S. Supreme Court is listed below. Find the percentile rank for each value. Which value corresponds to the 40th percentile? Construct a boxplot for the data and comment on their shape.
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