A PROFESSOR LOGGED OFFICE HOUR ATTENDANCE (COUNT OF THE NUMBER OF STUDENTS ATTEN
ID: 3150026 • Letter: A
Question
A PROFESSOR LOGGED OFFICE HOUR ATTENDANCE (COUNT OF THE NUMBER OF STUDENTS ATTENDING) FOR A CLASS DURING TWO SEPARATE SEMESTERS, SPRING AND FALL. THE PROFESSOR ALSO RECORDED THE DAY OF THE WEEK AND LOGGED IF ANY STUDENTS ATTENDED AT ALL. USE THE SUMMARY INFORMATION LINKED HERE TO ANSWER THE QUESTIONS BELOW. (ATTACHED WILL BE PICTURES OF THE SUMMARY INFORMATION)
1. The variables "AtAllSpring" and "AtAllFall" are
a) discrete
b) nominal
c) ordinal
d) continuous
2. The variables "OHSpring" and "OHFall" are
a) discrete
b) continuous
c) ordinal
d) nominal
3) What is the point estimate for the true difference in the mean number of students who will show up in the spring on Fridays (DaySpring F) compared to Wednesdays (DaySpring W)?
a) 0.4
b) -0.5714
c) -0.233
d) -2.714
e) 2.400
4. Is there a difference in the true proportion of days that students will show up at all for office hours between future spring and fall semesters?
a) Yes, bcause the CI for the true proportion of days students will show up at all is the same for the spring as it is for the fall semester, 0.575091 to 0.891576.
b) No, because the CI for the true difference in proportions of days when students will show up at all contains zero, as it is -0.223788 to 0.223788,
c) Yes, because the CI for the true mean number of students who will show up in the spring overlaps with the CI for the true mean number in the fall, namely (1.307, 2.693) and (1.469, 2.997).
d) No, because the CI for the true mean difference in the mean number of students who will show up contains zero, as it is -1.243 to 0.777.
5. Is there a difference in the true mean number of students who show up for office hours in future spring and fall semesters?
a) No, because the CI for the true mean difference in the number of students who will show up contains zero, as it is -1.243 to 0.777.
b) No, because the CI for the true difference in proportions of days when students will show up at all contains zero, as it is -0.223788 to 0.223788.
c) Yes, because the CI for the true proportion of days students will show up at all is the same for the spring as it is for the fall semester, 0.575091 to 0.891576.
d) Yes, because the CI for the true mean number of students who will show up in the spring overlaps with the CI for the true mean number in the fall, namely (1.307, 2.693) and (1.469, 2.997).
Explanation / Answer
1.
discrete becuase variables take specfic values.
2.
discrete becuase variables take specfic values.
3.
Mean of variable DaySpring F: 3.200
Mean of variable DaySpring W: 0.800
the point estimate for the true difference in the mean number of students who will show up in the spring on Fridays (DaySpring F) compared to Wednesdays (DaySpring W) is 3.200 - 0.800 = 2.400
4.
Following option is correct:
b) No, because the CI for the true difference in proportions of days when students will show up at all contains zero, as it is -0.223788 to 0.223788.
5.
Following option is correct:
a) No, because the CI for the true mean difference in the number of students who will show up contains zero, as it is -1.243 to 0.777.
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