The following table shows the percentage of individuals in each age group who us

Question

The following table shows the percentage of individuals in each age group who use an tax programs to prepare their federal income tax return Suppose follow up study consisting of personal interviews is to determine the most important in a method for How many 18- 34 old's be sample of at 25 that online tax program their tax return? How many 35- 44 old's be sample of at 25 that online tax program their tax return? How many 65+ old's be sample of at 25 that online tax program their tax return? How many 33-34 year old's must be sampled to find an export ad number of at least, that use an online tax program to prepare their uses an online tax program How many 35-44 year old's must be sampled to find an export ad number of at least, that use an online tax program to prepare their uses an online tax program

Explanation / Answer

Let the number of (18-34) required be x

then x *16 % = 25

x = 25/0.16 = 156.25

x > 157

b) for 35-44 year

x = 25/ 0.12 = 208.333

c)65 +

x = 25/0.02 = 1250

d)sd = sqrt (n*p *(1-p))

sd = sqrt(157*0.16*(1-0.16))

=4.59356

e) n = 209

sd = sqrt(209 *0.12*(1-0.12))

=4.69791

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