MULTIPLE CHOICE. Choose the one alternative that best completes the statement or

Question

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. (3 pts each) 1. The information we gather with experiments and with surveys is collectively called data a) True . b) False 2, A survey of 1500 American households found that 33% of the respondents own a computer is this value a parameter or a statistic? a) Parameter b) Statistic 3. Use the following summary information for a data set of 100 observations to determine whether the data set is likely to be bell-shaped, skewed to the right or skewed to the left. Mean 120, s 20, Minimum-60, Maximum 180 a) unable to determine from the information given b) c) ed) skewed to the left bell-shaped skewed to the right · The starting salaries of individuals with an MBA degree are normally distributed with a mean of $40,000 and a standard deviation of $6,000. Use the empirical rule to determine what percentage of MBA's will have starting salaries of S34,000 to S46,000? a) 68% b) 77% c)50% d) 95% To determine whether children born with fetal alcohol syndrome have a less than average IQ, 200 children between the ages of 8 and 10 who were born with the syndrome were given an IQ test and their scores were compared to the average IQ of children aged 8 to 10 who were born healthy. Wha type of study is this? a) Experimental b) Observational A statistical analyst obtains data concerning ankle injuries by examining hospital records from the st 3 years. What type of observational study is this? a) Retrospective b) Case-control )Prospective ) Cross-sectional ) Census

Explanation / Answer

1) a) TRUE

2) b) Statistic.

Parameters are numbers that summarize data for an entire population. Statistics are numbers that summarize data from a sample

3) c) bell shaped

4) a) 68%

5) a) Experimental, as a test is conducted.

6) Retrospective

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