# Confidence Intervals and Graphing: Hours Spent Training Per Year

A study of hours spent in training (per year) at a company was conducted with 49 participants. The mean number of hours spent in training was reported to be 89.25 hours. The standard deviation was 13.44 hours.

1. Calculate a 95% confidence interval for the average time spent in training per year at this firm.

2. Create a graph showing the data below as a frequency distribution. Note the mean and the confidence interval on the graph.

$210 220 230 240 270 300 300 320 320 320

340 370 370 380 400 410 450 450 470 470

490 500 500 510 510 540 570 580 580 640

490 500 500 510 510 540 570 580 580 610

610 620 640 640 650 660 690 750 760 790

https://brainmass.com/statistics/summary-tables/confidence-intervals-graphing-hours-spent-training-per-year-341735

#### Solution Preview

1. Calculate a 95% confidence interval for the average time spent in training per year at this firm.

Data:

n = 49

x-bar = 89.25

s = 13.44

% = 95

Standard Error, SE = s/âˆšn = 1.9200

Degrees of freedom ...

#### Solution Summary

The Solution provides Confidence interval and the graph. The frequency distribution is determined.