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The least-squares line. Open the Correlation and Regression applet. Let's use this applet to explore how the least-squares line changes when we move some observations. Start by putting 5 points on the plot that lie approximately on a straight line from the lower left to the upper right. Click on the box that says "Show least-squares line."
(a) Click on the point at the upper right and drag it straight down to the lower part of the display. Describe how the least-squares line changes when you do this.
(b) Drag the point that you moved back to its original position. Now, click on the middle point and drag it straight down to the lower part of the display. Describe how the least-squares line changes when you do this.
(c) Compare your results in parts (a) and (b), and summarize what you have learned about least-squares lines from this exercise.
Find the probability that a standard normal random variable will have a value between -2 and 300.
Mean of 2.25 ounces and a standard deviation of 0.15 ounce. 77% of the apples will contain at least how many ounces of juice?
a physician knows the probability that a patient will recover from a certain disease is 60 when treated with the
Case study on Page 635-636 of the text BOOK: (Anderson, Sweeney, Williams, Essentials of Modern Business Statistics w/ Microsoft Excel, 5th ed., South-Western College Pub, ISBN 978-0840062383 )Alumni Giving.
Construct a 96% confidence interval for the mean weight of all firefighters six months after the exercise rooms were installed.
For 2000 patients,blood-clotting time was normally distributed with a mean of 8 seconds and a standard deviation of 3 seconds.what percent was blood-clotting times between 5 and 11 seconds?
Two alloys A and B are being used to manufacture a certain steel product. An experiment needs to be designed to compare the two in terms of maximum load capacity in tons. Do you think these data strongly support alloy A
In a distribution of scores, the arithmetic mean is 51, the median is 55, and the mode is 62. What is the score, in percentile form, of a subject who does less well than two-thirds of the sample?
Data collection instrument used in managerial research. Why is it significant to make sure that these data collection methods and instruments are both reliable and valid?
If the selected coin is flipped twice and comes up heads twice in a row, what is the probability that the coin is two-headed?
Given a standard normal distribution, determine the following. Show Table Values used in each part.
Given the following data for a two-way ANOVA, identify the sets of null and alternative hypotheses, then use the 0.05 level in testing each null hypothesis.
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