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Intro to Stat_Part_10

# Intro to Stat_Part_10 - 44 CHAPTER 2 DESCRIPTIVE STATISTICS...

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44 CHAPTER 2. DESCRIPTIVE STATISTICS The next two questions refer to the following histogram. Frederico recently opened a "designer" T-shirt store near the beach. During the first month of operation, he conducted a marketing survey of a random sample of 111 customers. One of the questions asked the customer how many T-shirts he/she owns that cost more than \$19 each. Exercise 2.29 (Solution on p. 48.) The percent of people that own at most three (3) T-shirts costing more than \$19 each is approxi- mately: A. 21 B. 59 C. 41 D. Cannot be determined Exercise 2.30 (Solution on p. 48.) If the data were collected by asking the first 111 people who entered the store, then the type of sampling is: A. cluster B. simple random C. stratified D. convenience Exercise 2.31 (Solution on p. 48.) A music school has budgeted to purchase 3 musical instruments. They plan to purchase a piano costing \$3000, a guitar costing \$550, and a drum set costing \$600. The average cost for a piano is \$4,000 with a standard deviation of \$2,500. The average cost for a guitar is \$500 with a standard

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45 deviation of \$200. The average cost for drums is \$700 with a standard deviation of \$100. Which
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Intro to Stat_Part_10 - 44 CHAPTER 2 DESCRIPTIVE STATISTICS...

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