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Find the critical value for zalpha2 that corresponds to a

1. 459 randomly selected light bulbs were tested in a laboratory, 291 lasted more than 500 hours. Find a point estimate of the true proportion of all light bulbs that last more than 500 hours.

2. Find the critical value for z_α/2that corresponds to a degree of confidence of 98%.

3. Find the margin of error for the 95% confidence interval used to estimate the population proportion with n = 163 and x = 96.

4. Construct the confidence interval for question 3.

5. Interpret the confidence interval found in question 4.

6. What are the requirements for a Student's t-distribution?

7. Find the critical value for t_α/2corresponding to n = 12 and 95% confidence level.

8.Use the confidence level and sample data to find the margin of error E.

College students' annual earnings:

99% confidence, n = 81, x^- = $3967, s = $874

9. Construct the confidence interval for question 8 above.

10. Interpret the confidence interval found in question 9.

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Basic Statistics: Find the critical value for zalpha2 that corresponds to a

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