MATH 2310Confidence IntervalsUse SPSSFor this assignment, you will use software to calculate summary statistics for data, and then use those summarystatistics to calculate confidence intervals by...

MATH 2310






Confidence Intervals

Use SPSS

For this assignment, you will use software to calculate summary statistics for data, and then use those summarystatistics to calculate confidence intervals by hand.




The columns are not labeled in this data set. The first variable is just an index of the trial number. Thesecond variable is a description of the type of diet fed to the goose. The third variable is their percentweight change after being allowed to feed for 2.5 hours. The fourth variable is their digestion efficiency.
The fifth variable is the amount of acid-detergent fiber in their digestive tract.
Goals for this assignment:
 Refresh how to calculate summary statistics in SPSS
 Practice calculating confidence intervals
 Interpret results of confidence intervals

Activity 1






We will first analyze the weight change for the snow geese.



Skill Objective:Use SPSS to calculate the means and standard deviations for weight change forgeese fed a plant diet, and for geese fed a chow diet. Then, using these results, calculate by hand a99% confidence interval for the mean weight change for geese fed a plant diet, and a 99%confidence interval for the mean weight change for geese fed a chow diet.



Analysis Objective:Is there evidence that geese fed a plant diet will, on average, either gain or loseweight? What about for geese fed a chow diet?

Activity 2






Now we will examine digestion efficiency.



Skill Objective: Use SPSS to calculate the means and standard deviations for digestion efficiencyfor geese fed a plant diet, and for geese fed a chow diet. Then, using these results, calculate byhand a single 99% confidence interval for the difference in mean digestion efficiencies betweenthese two groups.



Analysis Objective: Based on your confidence interval, what can you say about how the averagedigestion efficiency compares between the two diets?