A scientist is interested in how breakfast foods affect short-term blood sugar levels. Two groups of human volunteers (n = 35 in each) are given either a standard cereal or Special J, a cereal designed to sustain higher blood sugar levels for 4 hours. After eating, each subject's blood sugar level is monitored (testing every 20 minutes) until it drops below 100, or until 5 hours has elapsed. The collected data are in blood_sugar_cereals.csv. These data are the elapsed time from eating until blood sugar dropped below 100. If blood sugar did not drop below 100 after 5 hours, the subjects were given the special value: -99. (Hint: you'll need to fix both the format of the file and the special values to get these data analyzed).

1. Provide the most appropriate graph of the data.

2. What two kind of censoring are present in these data?

3. Which statistical test is most appropriate? What is the statistical null hypothesis?

4. Provide appropriate descriptive statistics.

5. Provide a numeric and verbal description of the results of the scientific hypothesis test. Provide follow-up comparisons only if needed.

control	special J
80	80
190	120
90	-99
170	180
90	250
-99	160
110	-99
70	210
260	160
220	80
140	-99
-99	-99
240	-99
300	160
70	160
270	70
100	110
250	110
120	220
90	140
140	120
170	160
180	90
130	-99
-99	210
80	280
230	-99
90	220
100	270
100	170
130	-99
130	260
100	-99
200	-99
80	-99