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The relationship between Internet use (hours per week) and social interaction (hours per week) in a sample of 10 students is measured. The following table lists the hypothetical results of this study.
Internet Use Social Interaction
X Y
7 3
8 7
5 7
8 5
12 4
5 6
2 4
6 5
2 9
12 2
(a) How do I compute the Pearson correlation coefficient? (Round your answer to three decimal places.)
(b) How do I compute the coefficient of determination? (Round your answer to three decimal places.)
Data was collected on how much 8 customers recently spent for lunch at Benny's Café; see the Excel descriptive statistics file below.
(Improved Optimality Condition) Consider the minimum cost flow problem, without assuming that the problem data are integer. Show that if x is feasible, and x and p satisfy -CS, then x is optimal, provided
Test the hypothesis that the proportion of all student cell phone users in the United States who own a smartphone is 35%. Use the 5% level of significance and report your results.
a. After Joe came back, what is the expected time until the next bulb failure? b. What is the expected length of time between the fourth bulb failure
scores on the act test have a distribution that is approximately normal with mean 21.1 and standard deviation 5.1.what
You are a restaurant manager. You must pick 13 entrees for your menu. There are 11 meat offerings and 7 poultry offerings to choose from. (a) In how many ways can 13 entrees be randomly selected out of the 18 meat and poultry offerings? Show..
Develop a spreadsheet model to determine the optimal number of magazines to order each day. Use 500 replications and round the demand values generated by the normal random number generator (RNG) to the closest integer value.
The mean time required to complete a certain type of construction project is 52 weeks with a standard deviation of 3 weeks. Answer questions 4-7 using the preceding information and modeling this situation as a normal distribution.
A batch of invoices being audited has 5% of the invoices in error. A sample of 10 invoices is taken at random from the batch. What is the probability that the sample will contain i. exactly two incorrect invoices? ii. less than two incorrect inv..
The most common abuse of correlation in studies is to confuse the concepts of correlation with those of causation.
Jill constructs a test to measure a personality state. The test consists of multiple items which sum up to indicate the degree of the trait that is present.
(a) What is the probability that the product of the two rolls is at most 5 given that the first one is a multiple of 3? explain calculations
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