Find the instantaneous form for each of the following phasors: 20 (a) A, = j10a, +a (b) B, = j4e-*a, + 6e*P*a, (c) C, = j2e=20%e¬J#lda -20z
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- For the 17 girls whoreceived the family therapy, the changes in weight duringthe study (which are in the data file Anorexia at the textwebsite) were11, 11, 6, 9, 14,−3, 0, 7, 22,−5,−4, 13, 13, 9, 4, 6, 11.(a) Verify that ¯y = 7.29, s = 7.18, and se = 1.74.(b) To use the t distribution, explain why df = 16 and a95% confidence interval uses the t-score of 2.120.(c) Verify that the 95% confidence interval for the populationmean change in weight μ for this therapy is (3.6,11.0). Interpret.One home that is 1092 square feet is listed at $189,900. What is the residual at x = 1092?The correlation coefficient between people who get less than six hours sleep at night and caffeine intake is 0.39. This means that the hours of sleep a person gets has no relationship to the amount of coffee a person drinks True or False?
- What is indicated by a Pearson correlation of r = +1.00 between Xand Y? Each time X increases, there is a perfectly predictable increase in Y Every change in X causes a change in Y All of the other 3 choices occur with a correlation of +1.00. Every increase in X causes an increase in YA researcher studied the relationship between the amount of carbohydrates (x) and the amount of salt (y) in different food products. sample of 36 food products yielded these calculations: r = -0.1245, ŷ=0.5545– 0.1636x According to the correlation, if a food contains more carbohydrates, is it likely to contain more salt or less salt? Why or why not?The manager of a DVD rental store analyzed the number of DVD rentals (y) to the number of weeks the DVD had been available (x) and found a strong negative correlation. What does this mean? As the number of weeks the DVD has been available increases, the number of rentals of that DVD increases. As the number of weeks the DVD has been available increases, the number of rentals of that DVD decreases. No customers rent old DVDs. When a DVD is new, it causes people to rent it.
- Please solve it perfectlyIn the area of Russia récords were kept on the relationship between the rain Fall in inches and the yield of wheat (bushels per acre ).the data for a 9 year period is as follow. Rain fall x 13.1,11.4,16.0,15.1,21.4,12.9,9.6,18.2,18.6. yield y : 48.5,44.2,56.8,80.4,47.2,29.9,74.0,74.0,76.8 the equation of the line of least squares is given as ^y= -9.12+4.38x. How many bushels of wheat peen acre can be predicted if it’s is expected that there will be 30 inches of rain?The owener of a winery collects data on competing wineries every year. He would like to predict the gross sales (in number of cases) from the size of the wineries (in acres). What is the explanatory variable in this study?
- A set of n = 15 pairs of scores (X and Y values) produces a correlation of r = 0.40. If each of the X values are multiplied by 2 and the correlation is computed for the new scores, which value will be obtained for the new correlation?Pearson's r ranges from -1.00 (the strongest possible negative relationship) to + 1.00 (the strongest possible positive relationship). A value of 0 means there is no relationship between the two variables True or FalseKevin participated in an egg-drop event, where students design a device that will stop an egg from breaking when it's dropped. He recorded the time (in milliseconds) and the distance between the egg and the ground and found a strong negative correlation. What does that mean? As the time increases, the height of the egg decreases. As the time increases, the height of the egg increases. The egg eventually hits the ground. As the time increases, the height of the egg will decrease and eventually increase.