Satistics

Tutorial 1

INTRODUCTION AND KEY STATISTICAL CONCEPTS

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Tutorial Aims:

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explain basic statistical terms and concept

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compute and explain descriptive statistics

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Reading: Berenson et al, Chs 1-3

Q1. a. A manufacturer of mint lollies claims that less than 10% of his product is defective. When 1,000 lollies were drawn from a large production run, 7.5% were found to be defective. What is: the population of interest? the sample? the value of the parameter? the value of the statistic?

b. A large company wanted to determine client satisfaction with their products and services. The Director of Marketing developed a questionnaire that yields a satisfaction score between 10 and 50 for participant responses. A random sample of the company’s 900 clients is asked to complete a satisfaction survey. The satisfaction scores for the 35 participants are averaged to produce a mean satisfaction score. What is the population for this study? the sample? the statistic? What would be a parameter for this study?

Q2. For each of the following random variables, (i) determine whether the variable is categorical or numerical (identify continuous or discrete); (ii) determine whether the variable is nominal, ordinal, interval, or ratio.

a. amount of money spent on clothing in the last month

b. number of coats owned

c. favourite department store

d. amount of time spent shopping for clothing in the last month

e. most likely time period during which shopping for clothing takes place (weekday, weeknight, weekend)

f. primary type of transportation used when shopping for clothing.

Q3. a. What is statistics? Explain the difference between descriptive and...