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The brightness of a television picture tube can be evaluated by measuring the amount of current required to achieve a particular brightness. A sample of 10 tubes results in an Xbar=317.2 microamps with a s=15.7. Find a 95% prediction interval for the next observation (Xn+1).
1. explain why stepwise regression is necessary when there are many predictor variables.2. explain the main difference
If 15 subjects take a pre-test and a post-test with a mean change score of 1.5, and if the standard deviation of the comparison distribution is calculated to be .5, what is the t score?
How many commuters must be randomly selected to estimate the mean driving times of Chicago commuters? If we want 99% confidence that the sample mean is within 2 minutes of the population mean, and the population standard deviation is known to be 1..
Environmental health indicators include air quality, water quality, and food quality. Twenty-five years ago, 47% of U.S. food samples contained pesticide residues. In a recent study, 44 of 125 food samples contained pesticide residues.
Use the expected collision payment to determine the collision insurance premium that would enable the company to break even on the policy.
Based on the results of the peliminary poll, how large a sample is required for the main poll, assuming that the main poll should have a margin of error of 3.3% and a confidence level of 96.7%.
Suppose that people's heights (in centimeters) are normally distributed, with a mean of 165 and a standard deviation of 6. We find the heights of 40 people.
a researcher believe that college students spend a different amount of time talking on the phone than they do instant
assume that womens heights are normally distributed with a mean given by u62.3in and a standard deviation given by
Based on our poll what is the margin of error of the proportion of voters favoring the incumbent?
in this problem we explore the effect on the standard deviation of adding the same constant to each data value in a
A bridge hand consists of 13 cards dealt at random from an ordinary deck of 52 playing cards. How many possible bridge hands are there?
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