STAT 200 PSU Quiz 2 STAT 200 PSU Quiz 2

1.

Click the following link Minitab Data or Excel Data. From this data, use software to answer the following: 1. The mean of the variable Height in column C6. 2. The Interquartile Range (IQR) of the variable GPA in column C2. 3. Describe the shape of the variable CellTime in column C5

[removed]A) Mean = 67.254; IQR = 0.58; Skewed right 
[removed]B) Mean = 67.254; IQR = 0.58; Skewed left 
[removed]C) Mean = 67.723; IQR = 0.585; Skewed right 
[removed]D) Mean = 67.506; IQR = 0.60; Skewed right 

Feedback: To find the mean: go either to Stat > Basic Statistics > Display Descriptive Statistics and selecting Height, or going to Calc > Column Statistics > select the option Mean and select Height.

For IQR, first find Q1 and Q3 by going to Stat > Basic Statistics > Display Descriptive Statistics and selecting GPA. From this, IQR is found by Q3 - Q1.

To describe the shape, create a histogram [Graph > Histogram > select CellTime] and notice that the bulk of the data gathers to the left and "tails" tails to the right. So the shape would be described as skewed right or positively skewed.

2.

Close all minitab files Click the following link Minitab Data or Excel Data. From this data, use software to answer the following: 1. How many students answered the question regarding SAT Math scores (Column C14)? 2. Which Gender reported having the higher mean GPA (column C2)?

[removed]A) Answered = 241; Higher Mean GPA = Female; 
[removed]B) Answered = 250; Higher Mean GPA = Female; 
[removed]C) Answered = 241; Higher Mean GPA = Male; 
[removed]D) Answered = 250; Higher Mean GPA = Male; 

Feedback: Number who answered is 241. There were 9 students who did not answer this question - N*. For question 2, This can be found by going to Stat > Basic Statistics > Display Descriptive Statistics and selecting GPA for the variables box and Gender for the By Variable box. The results show that females have the higher mean.