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The management of a shop has gathered data on customer purchasing habits, and knows that 20% its customers typically make an additional purchase (e.g., cold drink, food item) beyond their hot beverage of coffee or tea. Let x represents the number of customers making purchases. What discrete probability distribution best describes this context? Is it reasonable to presume that customers make their purchases independently of each other? For all practical purposes, lers presume yes.] Answer the following questions.
If a population of 10000 customers is considered, how many on average would be expected to make these additional purchases?
Compute the population standard deviation for this random variable and use your answer from the previous question in order to complete the following observation: Out of a population of 10000 customers, on average _____ customers make additional purchases, give or take _____ customers.
You can invest the money in one of two mutual funds with similar yearly average returns (9.8% vs. 9.9%). Which mutual fund would you choose?
question eighteen per cent of multinational companies provide an allowance for personal long-distance calls for
The null hypothesis is to be tested at 95% confidence. Determine the critical values for this test.
A researcher studies the average distance that 130 people who are living in U.S. urban areas walk each week: What is the size of the sample? Identify the population.
Income: 1 = 0th-16th percentile, 2 = 17th-33rd percentile, 3 = 34th-67th percentile, 4= 68th-95th percentile, 5 = 96th-100th percentile
the national study of the changing workforce conducted an extensive survey of 2958 wage and salaried workers on issues
A student randomly guesses on all 25 questions of a true-false test. Use the normal approximation to the binomial to approximate Pr[ ], that is, that the student gets 10 or fewer questions correct.
a researcher is studying test anxiety using a standardized instrument that has a mean of 50 and a standard deviation of
In a clinical study of an allergy drug, 115 of the 204 subjects reported experiencing significant relief from their symptoms. At the 0.01 significance level, test the claim that more than half of all those using the drug experience relief.
What happens to the confidence interval and the power of the test at a particular point of interest
q1. consider two lotteriesl1 0.5 1000 0.2500 0.2300 0.1 200 l2 0.6 800 0.1600 0.3 100a using an exponential utility
suppose a random variable t has cdf ft and assume ft is continuous. what is the cdf of
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