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Question: a. If you want to be sure to get the best predictions, why not include among your X variables every conceivably helpful variable you can think of?
b. How can a prioritized list help you solve the variable selection problem?
c. Briefly describe two automatic methods for variable selection?
A random sample of 36 drinks from a soft drink machine has an average content 7.6 ounces with an standard deviation of 0.48 ounces. Test the hypothesis ounces against the alternative hypothesis at the 0.05 level of significance.
the city council of pine bluffs is considering increasing the number of police in an effort to reduce crime. before
specifically 68 of gen y people have a say in computer purchases. suppose you select a sample of 100 gen y
The leisure services committee of a local authority has seen its budget decline over the last few years and is currently having to consider closing a number.
According to a survey, people in the 20th century had an average age of 80 years. How does the mean age of these prime ministers compare to that?
clarify how you would display each of the following in a report 1. the outcomes of a t test with 38 degrees of freedom
Is the sample size large enough to apply the Central Limit Theorem (CLT)? Explain. Assume the other conditions for using the CLT are met.
a left-tail area in the chi-square distribution equals 0.95. for df10 the table value
Given the hypothesis Ho: u=400, you conduct a sample of 12 observations and obtain a sample mean of 407 and a sample standard deviation of 6. Using a .01 significance level to test to see if you would reject Ho, what would be the value of your cri..
a group of n men and m women is randomly lined up. find the expected number of men who are next to at least one woman.
Toss a coin 10 times and record the number of heads. If each student performs this experiment five times, a frequency distribution of the number of heads.
If the rainfall was recorded on 20 (instead of 10) randomly selected days throughout the year, the standard error of the mean would be equal to?
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