Please help me clarify/ Identify the missing term to complete the sentence.

1. Similar to the standard normal distribution, the t-distribution is __________ about t=0, bell-shaped and unimodal. (choices: asymptomatic, symmetric, flatter, wider).

2. In t-distribution, the variance is ____________. (choices: lesser than one, equal to one, greater than one, unknown)

3. Referring to the variance in the previous item, this makes the curve ___________ and ___________ in the middle. (choices: broader and steeper, narrower and flatter, broader and flatter, flatter and steeper)

4. As the sample size increases, the t-distribution gets closer to ________________. (choices: the tails, the z-distribution, having a variance of greater than 1, a critical value) 5. The z-critical value is used when the sample size is greater than or equal to 30 whereas t-critical value when the sample size is ________________. (choices: greater than but not equal to 30, less than half of the population, less than 30, greater than 50% of the total population) 6._________________ is used when the population variance is unknown. (choices: sample mean, average of the sample, sample standard deviation, population standard deviation) 7. The adjusted sample size is called _____________. This value is needed when identifying the t-critical value. (choices: lower confidence limit, margin of error, degrees of freedom, interval) 8. ________________________ provides a higher precision estimate of standard deviation than the individual sample standard deviation. (choices: pooled standard deviation, degrees of freedom, confidence level, confidence interval) 9. If the level of significance is 0.002 then the confidence level is ______. (choices: 98%, 98.8%, 80%, 99.8%)

Identify the missing value using the given on each item.

10. CL=95%, n=21, t=_______ (choices: 1.725, 2.528, 2.086, 1.325) 11. df=22, t=2.819, Level of significance=_______ (choices: 0.01, 0.002, 0.05, 0.1) 12. t=1.796, CL=90%, n=_______ (choices: 11, 12, 13, 14)

13. df=16, Area in one-tail=0.10, t=_______(choices: 1.337, 1.746, 2.120, 2.583) 14. Area in two-tails=0.02, n=29, t=_______ (choices: 1.701, 2.467, 3.408, 2.048)