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The speed of automobiles on I-20 west of FortWorth, Texas, is being investigating by the Texas Department of public Safety (DPs).
If the average speed of cars on the highway exceeds 80 miles per hour (mph), the DPS plans to add more patrol cars to the area. To decide what to do, it takes a random sample of 150 cars and finds the sample average speed to 80.5 mph. Assuming that the population standard deviation is 8 mph, should the DPS add patrol cars to the area?
Use exponential smoothing to develop simple, trend (Holt's), and seasonal models (both simple and trend) for forecasting the quarterly revenue from 1-year batteries.
Using the five steps of hypothesis testing and the 5% significance level (alpha), does showing the film change students' attitudes towards the chronically mentally ill?
A manufacturer of billiard balls is testing three additives to the basic plastic. Show the partial ANOVA table
Is a football jersey number a quantitative or a categorical variable? Support your answer with a detailed explanation
a scientist attempts to perform a difficult experiment. she is successful in about 80 of her attempts. she attempts the
Develop a forecasting model, justifying its selection over other techniques, and project attendance through 2007.
The following confidence interval is obtained for a population proportion, p:(0.458, 0.490). Use these confidence interval limits to find the point estimate, p-hat.
Randomly selected medical resident works more than 100 hours in a week? (c) What is the probability that a randomly selected medical resident works less than 60 hours in a week?
In a surgey of 280 adults over 50.80%; said they were taking vitamin supplements. Find the margin of error for this survey if we want a 99% confidence in our estimate of the percent of adults over 50 who take vitamin supplements.
What is the price of an extra dollar of c1 in terms of c2 and what is the equilibrium price? Output and profits of the low cost gold mine?
use newtons law of gravitation to compute the work required to launch a 1000-kg satellite vertically to an orbit 1000
The number of breakdowns is dependent on the shift, because the test value 11.649 is less than the critical value of 12.592.
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