Question

PLS HELP

Assume that all grade-point averages are to be standardized on a scale between 0 and 5. How many grade-point averages must be obtained so that the sample mean is within 0.009 of the population mean? Assume that a 98% confidence level is desired. If using the range rule of thumb, o can be estimated as
Range/4 = 5-0/4 = 1.25. Does the sample size seem practical?

1. The sample size is the proportion of the general population that are taking part in the study . In the given situation Sample size does not seem practical.

### What is Statistics?

Statistics is the discipline that concerns the collection, organization, analysis, interpretation, and presentation of data.
Given that grade-point averages are to be standardized on a scale between 0 and 5.
we need to find how many grade-point averages must be obtained so that the sample mean is within 0.009 of the population mean.
Let the confidence level to be desired is 98%.
The sample size can be calculated by using the formula
n = (z alpha/2 × S/E)^2
where n = sample size,
z alpha/2 = critical value for 98%
confidence = 2.58,
S = 1.25 and E = 0.009.
n = (2.58 × 1.25 / 0.009)²
= 55011.57 ~ 55012
=128401
Since the sample size is the proportion of the general population that are taking part in the study .
Hence, Sample size does not seem practical.