2. Obtain the following graphs from StatCrunch. a. histogram [2] b. cumulative f

Question

2. Obtain the following graphs from StatCrunch. a. histogram [2] b. cumulative frequency polygon [2) c. stem and leaf 12] d. box plot [2] e. normal probability plot 12) 3. Calculations a. midrange [1] b. coefficient of variation [1] c. percent of scores in one and two standard deviations of the mean [4] d. z scores for the largest and smallest data values [2] e. Q1 and Q3 -position of each in the list using the method the TI uses 13] f. scores required for mild and extreme outliers-indicate if there are any [4] 4. Confidence Intervals. Confidence Intervals are covered in Module 2. a. hand calculate the 95% confidence interval for ? [3] b, use StatCrunch or TI to obtain the 95% confidence interval for c. hand calculate the 95% confidence interval for ? [3] [1] use StatCrunch or TI to obtain the 95% confidence interval for ? [1]

Explanation / Answer

Solution3:

(a)

mid range=highest vaue+lowest value/2

=300+5/2

=152.5

coefficient of variation=sd/mean*100

=74.4/76.9*100

=96.75%

solutionc:

mean-sd =2.5 and mean+sd=151.3

in between 2.5 and 151.3 lies 68% of the data

mean-2sd=-71.9 and mean+2sd=225.7 lies 95% of the data.

Solutiond:

z score=x- popualtion mean/population sd

min value=5

z score=5-120/100

=-115/100

Z min=-1.15

Z score for minimum =-1.15

max score=300

Z=300-120/100

=1.8

Z score for max=1.8

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