A student receives test scores of 67, 88, and 95. The student's term project score is 70 and the homework score is 80. Each test is worth 25% of the final grade, the term project is 10% of the final grade, and the homework grade is 15% of the final grade. What is the student's weighted average score (final grade) in the class? O 81.5 O 79.4 80 O 78.2 Next Previous3 points The data below are the final exam scores of 10 randomly selected statistics students and the number of hours they slept the night before the exam. Calculate the linear correlation coefficient. n = 10 Ex =70 Zy =700 Ex 2= 504.4 Zy 2 = 53410 Exy = 5126.8 O 0.7225 O 0.90 O O 0.85 Next3 points The overnight shipping business has skyrocketed in the last ten years. The single greatest predictor of a company's success is customer service. A study was conducted to determine the customer satisfaction levels for one overnight shipping business. In addition to the customer's satisfaction level, the customers were asked how often they used overnight shipping. The results are shown below in the following table: Satisfaction level Frequency of Use High Medium Low TOTAL 5 per month 70 25 100 TOTAL 460 220 20 700 A customer is chosen at random. Find the probability that the customer uses the company more than five times per month (>5) AND the customer expressed low satisfaction with the company? O 0.0041 O 5/700 O 5/20 O 5/100 Next3 points An oil exploration company wants to develop a statistical model to predict the cost of drilling a new well. One of the many variables thought to be an important predictor of the cost is the number of feet in depth that the must be drilled to create the well. Consequently, the company decided to fit the simple linear regression model, y = bit + 60where y = cost of drilling the new well (in $thousands) and x = number of feet drilled to create the well. Using data collected for a sample of n=83 wells, the following results were obtained: v= 10.5 + 16.20x Give a practical interpretation of the estimate of the slope of the least squares line. O For each additional foot of depth drilled, we estimate the cost to increase by $16,200. For every one dollar cost increase, we expect the depth to increase by 16.2 feet. For each additional foot of depth drilled, we estimate the cost to increase by $10,500. O For a well with a depth of O feet, we estimate the cost to be $10,500. Previous Next eIt is known that P(A) = 0.7, P(B) = 0.4 and P(A and B) = 0.24. Which of the following is true? A and B are both independent and mutually exclusive (disjoint). O A and B are Mutually Exclusive (disjoint) O A and B are Independent O A and B are neither independent nor mutually exclusive (disjoint) Previous Next