Posted by **Meep** on Wednesday, October 31, 2012 at 11:22am.

A Kansas University research station wishes to investigate if a new variety of wheat is more resistant to a disease than an old variety. It is known that this disease strikes approximately 15% of all plants of the old variety. A field experiment was conducted, and of 120 new plants, 12 became infected.

The calculated value of the test statistic is:

1.83

1.10

-1.53

1.53

1.83

- AP Statistics -
**MathGuru**, Wednesday, October 31, 2012 at 8:00pm
You can try a proportional one-sample z-test for this one since this problem is using proportions.

Using a formula for a proportional one-sample z-test with your data included, we have:

z = .1 - .15 -->test value (12/120) is .1) minus population value (.15) divided by

√[(.15)(.85)/120] --> .85 represents 1-.15 and 120 is sample size.

Finish the calculation.

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