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What is linear regression measuring and What is the linear regression formula and how is it used?
If the national average was 600, is there enough evidence to conclude that the average score has decreased? Use a p-value and 5% significance.
Using this sample, do you believe the advertising campaign was successful? Why or why not?
Test the hypothesis of no differences for average payback period (years) necessary to justify solar heating systems for residences.
Determine the appropriate descriptive statistics. For normally distributed data use the mean and standard deviation. For significantly skewed data use the median and interquartile range.
understand interpret and be critical of the concepts of statistical signicance and p-values. statistical signicance is
Fuel Consumption and Cars In many rural areas, newspaper carriers deliver morning papers using their automobiles because the length of the route prohibits.
Quality control If 3% of all light bulbs a company manufactures are defective, the probability of any one bulb being defective is 0.03.
The same exponential distribution with the mean E(Xi)=2, (i=1, 2, ..., n), and Y=X1+X2+...+Xn. Find the moment-generating function of Xi (i=1, 2, ..., n).
Calculate the mean absolute deviation E(|X - µ|) for X, the number on a six-sided die.
A state transportation official claims that the mean waiting time at exit booths from a toll road near the capitol is no more than .40 minutes. for a sample of 35 motorists exiting the toll road, it was found that the mean waiting time was .46 min..
(a) Use a computer program to calculate the exact probability of obtaining one or more defectives in a sample of size 100 taken from a lot of 1,000 manufactured products assumed to contain six defectives.
You are given the sample mean and the sample standard deviation. use this information to construct the 90% and 95% confidence intervals for the population mean.
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