Explanatory variable caused response variable
What is wrong with this statement? High linear correlation proves that the explanatory variable (variable x) caused the response variable (y) to happen.
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A student wanted to construct a 95% confidence interval for the average age of students in her statistics class. She randomly selected 12 students. Their average age was 20.7 years with a standard deviation of 1.2 years. What is the best point est
What is the decision rule at the 0.01 level of significance to test if the new design increased the absorption amount of the sponge?
If the null hypothesis that two means are equal is true, where will 99% of the computed z-values lie between?
A bank wishes to estimate the mean credit card balance owed by its customers. The population standard deviation is estimated to be $297. If a 98 percent confidence interval is used and an interval of $84 is desired, how many customers should be sa
A national manufacturer of unattached garages discovered that the distribution of the lengths of time it takes two construction workers to erect the Red Barn model is normally distributed with a mean of 36 hours and a standard deviation of 5 hours
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Compute the population standard deviation for this random variable and use your answer from the previous question in order to complete the following observation: Out of a population of 10000 customers, on average _____ customers make additional pu
Suppose you know that the distribution of sample proportions of the residents of one town over 70 years old in samples of 110 residents is normal with a mean of 0.12 and a standard deviation of 0.03.
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