# Tutor profile: Sekajipo T.

## Questions

### Subject: SAT

A research assistant randomly selected 75 undergraduate students from the list of all students enrolled in the psychology-degree program at a large university. She asked each of the 75 students, “How many minutes per day do you typically spend reading?” The mean reading time in the sample was 89 minutes, and the margin of error for this estimate was 4.28 minutes. Another research assistant intends to replicate the survey and will attempt to get a smaller margin of error. Which of the following samples will most likely result in a smaller margin of error for the estimated mean time students in the psychology-degree program read per day? A)40 randomly selected undergraduate psychology-degree program students B) 40 randomly selected undergraduate students from all degree programs at the college C) 300 randomly selected undergraduate psychology-degree program students D) 300 randomly selected undergraduate students from all degree programs at the college

The correct answer is C Increasing a sample size of a select group gives more accurate information , thus decreasing the margin of error. If you ask 2 friends how long they slept they might say 11 or 5 hours. If you ask a third friend they might say 7 hours. The more answers you receive, the more your data will hover around 7 or 8 hours of sleep, decreasing the margin of error overtime. Answer D is not correct since all random undergrads is a different subset of people from just undergrad psychology students.

### Subject: Microsoft Excel

How do I remove blank cells from my table?

-On the home tab, look for the "find and select" button -Click on "Go to Special" in the dropdown menu -Click on Blanks Now the blanks will be highlighted on the excel sheet. Next thing you have to do is right click and select delete to delete them

### Subject: Pre-Calculus

Consider the function f(x) = –(x – 4)(x + 3)(x – 3). a) Determine the end behaviour of the function.

The graph points up to the left and down on the right. From a visual standpoint, the graph begins in Quadrant II and ends in Quadrant IV.

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