Example 1.13 The Public Policy Institute of California carried out a telephone s

Question

Example 1.13 The Public Policy Institute of California carried out a telephone survey of California adult residents during April 2006 to ascertain how they felt about various aspects of K-12 public education. One question asked was Overall, how would you rate the quality of public schools in your neighborhood today The table below displays the frequencies and relative frequencies, and the figure below shows the corresponding Select Frequency Distribution for the School Rating Data Rating Frequeney Relative Frequency 478 893 680 178 100 172 2501 191 357 272 071 Don't know 1.000 Chart of Relative Frequency vs Rating 0.4 ? 0.3 0.2 0.1 0.0 ABCDF Dont know Histogram ol the school rating data rom Minitab More than -Select , the respondents gave nA or B rating, and only slightly more than 10% gave a D or F rating. The percentages for parents of public school children were somewhat more favorable to schools: 24%, 40% 2496, 6%, 4%, and 2%

Explanation / Answer

In the given table the total of frequency = 2501.

Hence, the public policy institute of california carried out a teleplhone survey of 2501 california adult residents.

Now, the Histogram given is the chart of frelative frequency vs rating.

Hence, the table below displays the frequencies and relative frequencies, and the figure bellow shows the corresponding Relative Frequencies.

Now, from the given table

More than 50%  of the respondents gave an A or B rating.

Rating relative frequency percentage A .191 19.1% B .357 35.7% A or B 54.8%

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