A Sample of 250 Adults Tried the New Multigrain Cereal

question 89

Multiple Choice

A sample of 250 adults tried the new multigrain cereal Wow! A total of 187 rated it as excellent. In a sample of 100 children,66 rated it as excellent. Using the 0.1 significance level,the researcher wishes to show that adults like the cereal better than children. What test statistic should we use to compare the ratings of adults and children?

• A)A z-statistic
• B)A right one-tailed test statistic
• C)A left one-tailed test statistic
• D)A t-statistic

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Definitions:

Frequency Distribution

A summary of how often each value in a set of data occurs, often displayed in a table or graph.

Class Interval

The range of values into which data are grouped for frequency distribution purposes, often used in histograms.

Histogram

A graphical representation of data using bars of different heights to show the frequency of data in successive intervals.

Frequency Polygon

A graphical representation of the distribution of a dataset that shows how often each value occurs, connecting the middle of each interval.