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The following chart below represents the bedtimes of 100 students at Waller Junior High in a recent survey Number of Students Bedtime 8:00 PM 22 8.30 PM 17 9:00 PM 36 9:30 PM 25 If all 750 students at WJH were surveyed, what is the best prediction of the number of students who would have a bedtime of 9:00 PM in

The Following Chart Below Represents The Bedtimes Of 100 Students At Waller Junior High In A Recent Survey Number Of Students Bedtime 800 PM 22 830 PM 17 900 PM class=

Sagot :

Answer

The predicted number of students with bedtime of 9:00 PM

= 270 students

Explanation

For surveying and sampling, the fraction of a particular case in the sample is generalized for the entire population to predict that case for the population.

So, if we want the number of students who would have a bedtime of 9:00 PM, we first find the percentage of students with bedtime of 9:00 PM in the sample.

Number of students with bedtime of 9:00 PM in the survey = 36

Total number of students in the survey = 22 + 17 + 36 + 25 = 100

Percentage of students with bedtime of 9:00 PM in the survey = (36/100) = 0.36

So, in the population of 750 students,

The predicted number of students with bedtime of 9:00 PM = (0.36) (750) = 270 students

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