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Question: Correlation and regression. If the correlation between two variables x and y is r = 0, there is no straight-line relationship between the variables. It turns out that the correlation is 0 exactly when the slope of the least-squares regression line is 0. Explain why slope 0 means that there is no straight-line relationship between x and y. Start by drawing a line with slope 0 and explaining why in this situation x has no value for predicting y.
The following data represent the concentration of organic carbon collected from organic soil. Construct a 99% confidence interval for the mean concentration.
A container of liquid laundry detergent promises over 100 loads from the bottle. You sample 45 bottles and find a mean of 102 loads with a standard deviation of 3.75 loads. At the 0.01 level of significance, is the manufacturer's claim supported?
Standard deviation 2.8 inches. (a) If you choose one student at random, what is the probability that he is between 69 and 71 inches tall?
Determine the point estimate, then construct the 95%con?dence interval for µ7 = the average attitude toward Springdale Mall. What is the maximum likely error in the point estimate of the population mean?
a researcher conducts a study of white and black attitudes toward the police in her community.the percentage of white
Using the raw measurement data presented below, calculate the t value for independent groups to determine whether or not there exists a statistically significant difference between the salaries of female and male human resource managers.
Find a 95% confidence interval for the proportion of people that prefer version 2, Just considering the people that like the product, find a 95% confidence interval for the mean of the variable "How much they would pay"
in a normal distribution find the probability expressed as a percentage that is greater than a z score of
suppose we want to determine the binomial probability p of getting 5 heads in 15 flips of a 2-sided coin. using the
a bag contains 6 green marbles 10 blue marbles and 4 yellow marbles. what is the chance of drawing a green marble? if a
Wildlife Hummingbirds Selasphorus sasin is the scientific name for what is commonly called "Allen Hummingbird" This beautiful hummingbird lives on the west coast of the United States and is named C.A. Allen
the manager of the eris shoe company must decide whether or not to contract a controversial sports celebrity as its
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