. The new regression equation (with point (0, 84) removed) is now y hat- 30.6865

Question

. The new regression equation (with point (0, 84) removed) is now y hat- 30.6865 + 12.3091x, where y hat is the predicted grade and x is the hours spent studying According to this, what would be the predicted grade for someone who studied 4.5 hours? Show your work 2. 556 students take introductory statistics at a particular university. The class is offered in three forms: all online, all in-person, or a "hybrid" class that is part online and part in- person. The breakdown is as follows Online only: In-person only Hybrid: 111 students 361 students 84 students In order to do a study to see the overall success of the class, 55 students were randomly selected to be in the sample. when looking at those 55 students, 23 of them (or 42%) had A's in the class. Questions a through g are worth 2 points each a. What type of number is 55? (A) Parameter (B) Statistic b, what type of number is 42%? (A) Parameter (B) Statistic c. The variable, "form of the class," (online, in-person or hybrid) is what type of variable? (A) Qualitative (B) Discrete quantitative (C) Continuous quantitative d. The variable, "percent of students receiving an A" is what type of variable? (A) Qualitative (8) Discrete quantitative (C) Continuous quantitative

Explanation / Answer

Answers with detailed explanation below:

1.yhat = 30.6865+12.3091x
x = 4.5 hours, so, yhat = 30.6865+12.3091*4 = 79.92

2.
a.55 is a Statistic , since statistic is of a sample, and 55 is a sample. Parameter is that of a population

b. It again is a b)statistic, since it is based on sample

c.Variables can be classified as categorical or qualitative. A is right

d.It can take any continous value, and therefore, C) Continous Quantitative

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