A candy bar manufacturer is interested in trying to estimate how sales are influ
ID: 3234390 • Letter: A
Question
A candy bar manufacturer is interested in trying to estimate how sales are influenced by the price of their product. To do this, the company randomly chooses 6 small cities and offers the candy bar at different prices. Using candy bar sales as dependent variable, the company finds the simple linear regression on the data below to be y^= 161.4 - 48.19z If the price of the candy bar is set at $2, the predicted sales will be 30 65 90 100 None of the above Given the least squares regression line y^= 2.48 - 1.63z which has r^2 = 0.81, the correlation (r) between y and x is: -0.85 0.85 -0.90 0.90 The following table displays counts of people by gender and marital status. what percent of the married people are female? (Round to the nearest whole percent) 17% 30% 50% 55% 60% None of the above A sample of 2500 people was asked how many cups of coffee they drink in the morning. You are asked given the following sample information. What is the expected number of cups of coffee? 1 1.2 1.5 1.7 2 None of the above The average length of stay in hospital is useful for planning purposes. Suppose that the following is the distribution of the length of stay in a hospital after a minor operation What is the probability that someone, after a minor operation in this hospital, will stay at least days? 0.15 0.35 .85 0.65 4.2 None of the aboveExplanation / Answer
answer
8)60/200*100
=30%
therefore answer B ic correct
9)E(X)=0+0.36+0.48+0.36
=1.2
10)1-0.05+0.20+0.40
=1-0.65
=0.35
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