There Are a Number of Highly Touted Search Engines for Finding

question 23

Multiple Choice

There are a number of highly touted search engines for finding things of interest on the Internet. Recently, a consumer rating system ranked two search engines ahead of the others. Now, a computer user's magazine wishes to make the final determination regarding which one is actually better at finding particular information. To do this, each search engine was used in an attempt to locate specific information using specified keywords. Both search engines were subjected to 100 queries. Search engine 1 successfully located the information 88 times and search engine 2 located the information 80 times. Using a significance level equal to 0.05, what is the critical value for the hypothesis test?

• A) z = ±196
• B) z = 1.645
• C) t = ±2.0456
• D) z = ±2.575

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Definitions:

Adjusted Coefficient

A modified version of a coefficient in statistical models that accounts for the number of predictors or the sample size to avoid overfitting.

Multiple Regression

A statistical method that utilizes a number of predictor variables to determine the outcome of a criterion variable.

Life Expectancy

An average estimate of the number of years a person or organism is expected to live, based on statistical analyses of age-specific mortality rates.

Regression Model

A statistical model that analyzes the relationship between a dependent variable and one or more independent variables.