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The Indiana State Police wish to estimate the average mph being traveled on the Interstate Highways, which cross the state. If the estimate is to be within ±5 mph of the true mean with 95% confidence and the estimated standard deviation is 25 mph, how large a sample size must be taken?
Construct a 95% confidence interval for the proportion of adults from the West who say traffic congestion is a serious problem.
The probability of going to college is 0.4. What is the probability that the proportion of women who go to college is greater than 50%.
Find the 90% confidence interval for the variance and standard deviation if a sample of 15 has a standard deviation of 2.3. Assume the variable is normally distributed.
1. a random survey of airline passengers were asked if they had ever flown before. their responses were as
What is the probability that a randomly chosen eight-week old baby smiles between 2 and 18 seconds?
Given the following data on Asian and European Share of U.S. Light Truck Sales(1990-2003): Plot the market-share data. (b) Describe the trend (if any) and discuss possible causes. (c) Fit three trends (linear, exponential, quadratic).
what does bivariate normal distribution mean? explain in words or illustrate with a
The sample average is $97, and the SD is $17. Assume that the repair cost has a normal curve. What is the null hypothesis?
The following data are the lifetimes (in hours) of 20 certain electrical components: Find a point estimate and 90% confidence interval for the population lower quartile.
Produce the scatter plot for sodium and bp. Do you think there are any outliers?
We have a box of 12 light bulbs. The probability that a particular light bulbs lights on opening is 0.95. This meets the binomial assumptions. Find the probability that 9 light bulbs light up.
A group of students collected data at the Cedar Point amusement park and reported that the "wait time" to ride the "Top Thrill Dragster" roller coaster is consistently distributed within a range of 40 minutes to 90 minutes.
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