Chapter 2.1, Problem 2.11E

(a)

To determine

To find: the highest percent of residents aged 25 to 34 and reason for an unusually high percent of residents in this age group.

Answer to Problem 2.11E

16.0%

Explanation of Solution

Given:

  

By seeing the stem plot it is observed that 16.0% is the highest percentage and therefore this would be percent of the researcher, mainly because of immigration.

(b)

To determine

To Explain: the shape, centre and spread of the distribution, ignoring the researcher.

Explanation of Solution

Given:

  

By seeing the stem plot, it is observed that centre is at 13.0% and the minimum and maximum percentages are 11.4% and 16.0% so the spread is between 11.4% and 16.0%. It is also observed that the data is approximately symmetric.

(c)

To determine

To Explain: that the distribution for young adults more or less spread out than the distribution in the figure for older adults, justify the answer.

Explanation of Solution

Given:

  

It seem less because the spread of data was between 7.0% and 17.0% and lower value is lower than the lower certain value in (b) and upper value is higher than the upper certain value in (b).