# To calculate a CI, you must use a two-tailed critical value appropriate to the test (z or t) that…

To
calculate a CI, you must use a two-tailed critical value appropriate to the
test (z or t) that you are using. Explain why a two-tailed value must be used.
Feel free to use an example.

Briefly,
what is the difference between the population and the alternative
population?

Suppose
the mean of a population is 65 and the standard deviation is 1

Calculate
the following CIs around a sample mean of 50. (Use the table of z-values in
Appendix A for your calculations, and think carefully about how you might find

a.
95%

b.
99%

c.
6
»

To
calculate a CI, you must use a two-tailed critical value appropriate to the
test (z or t) that you are using. Explain why a two-tailed value must be used.
Feel free to use an example.

Briefly,
what is the difference between the population and the alternative
population?

Suppose
the mean of a population is 65 and the standard deviation is 1

Calculate
the following CIs around a sample mean of 50. (Use the table of z-values in
Appendix A for your calculations, and think carefully about how you might find

a.
95%

b.
99%

c.
68%

d.50%e.34%

f.
60%

g.
What happens to the width of the CI as the critical z-value changes?

»

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