Question

a. Use the Student's t distribution to find tc for a 0.99 confidence level when the...

a. Use the Student's t distribution to find tc for a 0.99 confidence level when the sample is 8. (Round your answer to three decimal places.)

b. Use the Student's t distribution to find tc for a 0.90 confidence level when the sample is 8. (Round your answer to three decimal places.)

c. Sketch the area under the standard normal curve over the indicated interval and find the specified area. (Round your answer to four decimal places.)

The area to the right of z = 0.25 is  .

d. Sketch the area under the standard normal curve over the indicated interval and find the specified area. (Round your answer to four decimal places.)

The area between

z = −1.38 and z = 1.98 is  .

Math   Statistics-And-Probability   
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