Assume that the significance level is $\alpha=0.01$. Use the given information to find the critical value(s).
The test statistic of $z=-0.77$ is obtained when testing the claim that $p< 0.7$.
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The critical value(s) is/are
(Round to two decimal places as needed. Use a comma to separate answers as needed.)

Step 1 ：Assume that the significance level is \(\alpha=0.01\). Use the given information to find the critical value(s).

Step 2 ：The test statistic of \(z=-0.77\) is obtained when testing the claim that \(p<0.7\).

Step 3 ：The question is asking for the critical value(s) for a significance level of \(\alpha=0.01\) for a one-tailed test (since the claim is that \(p<0.7\)). The critical value is the z-score that corresponds to the given significance level in the standard normal distribution. Since this is a one-tailed test and the claim is that \(p<0.7\), we are looking for the z-score that corresponds to the area to the left under the standard normal curve.

Step 4 ：\(\alpha = 0.01\)

Step 5 ：critical_value = -2.3263478740408408

Step 6 ：The critical value for a significance level of \(\alpha=0.01\) for a one-tailed test is approximately -2.33. This is the z-score that corresponds to the given significance level in the standard normal distribution.

Step 7 ：Final Answer: The critical value(s) is/are \(\boxed{-2.33}\).