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Question: Cold calls. Justine works for an organization committed to raising money for Alzheimer s research. From past experience, the organization knows that about 20% of all potential donors will agree to give something if contacted by phone. They also know that of all people donating, about 5% will give $100 or more. On average, how many potential donors will she have to contact until she gets her first $100 donor?
Find a 95% confidence interval for the difference in the proportions of people who may find these medications effective. Interpret your interval.
Draw the standard normal distribution, label the axis, locate both z-scores on the axis (z7 = -1.5, z15 = 2.5), and shade an area equal to the probability that a randomly chosen croaker fish will be b/t 7 and 15 inches.
The company is considering increasing fares by an appropriate amount to cover expected compensation to passengers who lose their luggage. By how much should the airline increase fares? Why? Explain, using the ideas of a random variable and its exp..
Use these two variables to answer the following questions: Depression and Drug Use.
Fitting of multiple linear regression equation - Give a list of the model assumptions for a regression model.
The monthly sales of a mobile phone shop have been distributed with a standard deviation of $900. A statistical study of sales in the last nine months has found a confidence interval for the mean of monthly sales with extremes of $5663 and $6839.
(a) Prepare to do this by generating 16 random integer numbers from the mixed congruential generator, xn+1 ≡ (5xn + 3) (modulo 16) and x0 = 1.
What is the probability of observing 10 or more plugged defects if in fact the 3.5 average per sheet is being satisfied?
The quality of the orange juice produced by a manufacturer (e.g., Minute Maid,Tropicana) is constantly monitored. There are numerous sensory and chemical components that combine to make the best tasting orange juice.
Over the last ten years, the average GPA has been 3.0. Is this year's class significantly different from the long-run average? At what alpha level would it be significant?
In looking at your business, when and why would you want to use a one-sample mean test (either z or t) or a two-sample t-test? Create a null and alternate hypothesis for one of these issues. How would you use the results?
Based on the earnings below, is there sufficient evidence to conclude, at the 99% level of confidence, that one of these divisions is more profitable than the others? Calculate the mean square for factor, and the mean square for error.
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