Q 8.15RP. - Elementary Statistics

Question

A random sample of size $128$ is taken from a population. A normal probability plot of the sample data shows no outliers but has significant curvature. The population standard deviation is known.

Step-by-Step Solution

Answer

The normal probability shows that the distribution of the data is roughly linear with some outliers.

Step 1: Given information

A population is sampled with a $128-$person random sample. The sample data display significant curvature but no outliers on a normal probability curve.

Step 2: Concept

The formula used: is the $z-$interval procedure and $t-$interval procedure 

Step 3: Explanation

Determine whether the $z-$interval process, the $t-$interval procedure, or neither is the best method for generating the confidence interval.

The sample size is tiny, and the standard deviation of the population is unknown. Furthermore, the normal probability reveals that the data distribution is nearly linear with a few outliers.