Question

In a market test of a new chocolate raspberry coffee, a poll of 400 people (sample 1) from Dobbs Ferry showed 250 preferred the new coffee. In Irvington, 170 out of 350 people (sample 2) preferred the new coffee. We want to know whether a higher proportion of people in Dobbs Ferry prefer the new coffee. What is the statistic test type involved here?

Answer 1

Proportion

Explanation:

Given that a poll of 400 people (sample 1) from Dobbs Ferry showed 250 preferred the new coffee

Sample proportion for I =
`(250)/(400) =0.625`

In Irvington, 170 out of 350 people (sample 2) preferred the new coffee.

Sample proportion for II =
`(170)/(350) =0.4857`

Both are in decimals thus comparing is easier

We find that

`0.625>0.4857`

Hence a higher proportion of people in Dobbs Ferry prefer the new coffee.

The statistic test type is use of proportion