Statistic	Std. Error
X2 = Age	Mean	56.71	.826
95% Confidence Interval for Mean	Lower Bound	55.09
Upper Bound	58.34
5% Trimmed Mean	57.09
Median	60.00
Variance	218.944
Std. Deviation	14.797
Minimum	20
Maximum	89
Range	69
Interquartile Range	19
Skewness	-.518	.136
Kurtosis	-.499	.271

Question background: Let's now focus on CFIs' age (X₂ in the Research Project 1 data set). Use your statisticalsoftware program to acquire the sample's mean, SE, and 95% CI. According to the FAA, themean age of all CFIs ism = 48.0. Note that the sample mean age is M= 56.7 (note that N=321because19CFIsdidnotreporttheirage).

Hereisthequestion: Doesthesamplemeanage differ significantly fromthepopulation mean age?

1. WritethenullandalternativehypothesesthatcorrespondtothisRQ?
2. Use the 95% CI to determine if you will fail to reject or rejectthenull hypothesis. Explain.
3. Interpretthe95CIinthecontextofthegivenresearch setting.
4. Doyouthinkthecorrespondingaccuracyinparameterestimationishighorlow?Explain.