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An electric utility wishes to examine the relationship between temperature and electricity use in its service region during the summer months. The bivariate data below give the maximum temperature (denoted by x, in degrees Fahrenheit) and the electricity use (denoted by ,y in thousands of kilowatt hours) for a random sample of fifteen summer days. The data are shown in the Figure 1 scatter plot. Also given are the products of the temperature values and values for electricity use for each of the fifteen days. (These products, written in the column labelled "x,y" may aid in calculations.) .
x y xy
92.4 342.3 31628.52
69.1 306.8 21199.88
89 313.1 27865.9
82.5 311.3 25682.25
70.7 282.7 19986.89
84.6 353 29368.8
82.3 258.4 21266.32
94.8 334.8 31739.04
72.4 231.3 16746.12
82.2 322.3 26493.06
99.1 381.6 37816.56
90 312.1 28089
75.3 293.7 22115.61
96.6 310.2 29965.32
93.9 371 34836.9
What is the value of the slope of the least-squares regression for these data rounded to two decimal points?
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If a student guesses on each question, what is the probability that the student will pass the test?
Suppose you found that in doing the hypothesis test, you were able to reject the null hypothesis. What is the most appropriate conclusion to draw?
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Average Precipitation For the first 7 months of the year, the average precipitation in Toledo, Ohio, is 19.32 inches. If the average precipitation is normally distributed with a standard deviation of 2.44 inches, find these probabilities.
The random variable X, representing the number of accidents in a certain intersection in a week, has the following probability distribution
Test the given claim using the traditional method of hypothesis testing.
As of 2012, the proportion of students who use a MacBook as their primary computer is 0.36. You believe that at your university the proportion is actually greater than 0.36. If you conduct a hypothesis test, what will the null and alternative hypo..
Research question : At α = . 01, is degree of certainty independent of credits earned?
What is a discrete random variable and how does it differ from a continuous random variable? Give examples.
Either summarize your design or give an appropriate layout with table.
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