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Mathematical Applications for the Management, Life, and Social Sciences
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Chapter 7 / Exercise 16
Mathematical Applications for the Management, Life, and Social Sciences
Harshbarger
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1703 Review 2 1. A simple random sample of size n = 20 is obtained from a population with μ = 64 and σ = 17. Assume the data are normally distributed. (a) Determine P x < 67 . 3). (b) Determine P x 65 . 2). 2. Many people sleep in on the weekends to make up for “short nights” during the work- week. A random sample of 40 adults found that the mean sleep time each night last weekend was 7.6 hours with a sample standard deviation of 1.2 hours. Construct a 95% confidence interval for the mean hours of sleep by adults each night last weekend. Interpret the interval. 1
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Mathematical Applications for the Management, Life, and Social Sciences
The document you are viewing contains questions related to this textbook.
Chapter 7 / Exercise 16
Mathematical Applications for the Management, Life, and Social Sciences
Harshbarger
Expert Verified
3. A simple random sample of size n = 75 is obtained from a population whose population proportion with a specified characteristic is p = 0 . 80. (a) Describe the sampling distribution (shape, center, and spread) of ˆ p . (b) What is the probability of obtaining x = 63 or more individuals with the charac- teristic? (c) What is the probability of obtaining x = 51 or fewer individuals with the charac- teristic? 4. We would like to start an ISP and need to estimate the average Internet usage of households in one week for our business plan and model. How many households must

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