A researcher randomly selects 500 homeowners under 30 years of age simple random

Question

A researcher randomly selects 500 homeowners under 30 years of age simple random striated systematic convenience duster The pie chart shows the percentage of votes received by each candidate in the student council presidential election. What percent of the votes and Gina receive together? Gina 22% Jim 32% Lili 19% Ming 27% 59% 22% 41% 19% The following data represent the monthly phone use. in minutes, of a 421 customer enrolled in a fraud prevention program for the past 20 months. The 471 421 526 430 phone company decides to use the upper fence as the cut off point for the 352 number of minutes at which the customer should be contacted. What is the 417 472 536 412 cutoff point? 420 minutes The cutoff point is (Round to the nearest minute.)

Explanation / Answer

1. (b) Startified . In startified sampling the population is divided into non overlapping groups and then a sample is selected from each group or startum.

Here also the population is divided into different groups based on their age and then people are selected from each of the group. Hence it is a classical example of startified sampling.

2. Lili and Gina together recieved 19+ 22 = 41% of the votes.

3. Upper fence = Q3 + 1.5*IQR

where Q3 is upper quartile and IQR is the interquartile range.

In our case Q1 = 405.5 and Q3 = 527

IQR = Q3-Q1 = 527-405.5 = 121.5

Upper fence = 527 + 1.5*121.5=709.25

Hence the cutoff pint is 709.25 minutes.

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