Answer:
Critical value zc=-2.326
Step-by-step explanation:
We have a left tailed test regarding a population proportion.
The significance level is α=0.01.
That means that the critical value zc satisfies the equation:
[tex]P(z<z_c)=0.01[/tex]
This critical value needs to be looked up in a standard normal distribution probability table (or an applet or software).
The value for this critical value is zc=-2.326.
A picture of the stantdard normal distribution and the critical value is attached.
