What is the t-score associated with 90% confidence and a sample size of 15?

• A. 1.341

• B. 1.345

• C. 1.753

• D. 1.761

What is the degrees of freedom equal to?

• A. n

• B. n + 1

• C. n - 1

• D. 1 - n

A 90% confidence interval for the mean speed driven by cars on East Main St. is given by (21, 45). What was the sample mean of this study?

• A. 12

• B. 33

• C. 42

• D. None of these.

What is the other term for t-distribution?

• A. Student’s T-Distribution

• B. Probability Distribution

• C. Percentile Distribution

• D. Z-Distribution

Identify the t-value whose number of samples n = 9 and has an (𝛼) equal to 0.05.

• A. 0.261

• B. 1.860

• C. 1.833

• D. 3.355

Find the t-value for a 99% confidence interval with a sample of 23 people.

• A. 1.714

• B. 2.064

• C. 1.711

• D. None of these.

T-distribution is a probability distribution used to estimate parameters EXCEPT when________.

• A. The population standard deviation is known

• B. The sample size is small

• C. The population variance is unknown

• D. The sample size is small and the population variance is unknown

This refers to the measure of position with data divided into 100 parts.

• Percentiles

• Deciles

• Quartiles

• Median

What is the right-tailed area if the confidence interval is 75%?

• 0.05

• 0.10

• 0.005

• 0.25

What will be the degree of freedom of the data whose sample size is 18?

• 17

• 18

• 19

• 20