Exam 3: Statistical Description of Data

A standardized value that is either a large positive number or a large negative number is a relatively usual occurrence.

Which of the measures of central tendency would best represent the data below? $\begin{array} { | l | c | } \hline \text { Project Management Software } & \text { Price (\$) } \\\hline \text { APECS } & 55,000 \\\text { The Chief Software: Project } & 3,900 \\\text { Management } & 249 \\\text { CPM/PERT } & 50 \\\text { Demi Plan } & 115 \\\text { Expert } & 395 \\\text { Harvard Project Manager } & 249 \\\text { Intepert } & 695 \\\text { LISA7/7 } & 395 \\\text { Micro Trak } & 595 \\\text { Milestone } & 250 \\\text { Pathfinder } & 299 \\\text { PC-PATH } & 995 \\\text { Plan/Trax } & 795 \\\text { Pro-Ject 6 } & 199 \\\text { Task } & 329 \\\hline\end{array}$

The length of the box in the box-and-whisker plot portrays the:

The following table represents the number of days that a hardware store experienced various daily demands for a particular hammer during the past 65 days of business. Daily Demand Number of Days 0 10 1 15 2 12 3 18 4 16 5 4 Determine the average daily demand over this time period.

The ____________________,a variant of the range,is the average of the lowest data value and the highest data value.

A sample of 10 U.S.families spent the following amounts (in dollars)on groceries during a one-week period: 31.36,68.76,12.25,10.85,24.89,31.48,49.52,48.24,30.04,and 25.63.Find the median amount spent on groceries.

Compute the mean,median,and mode from these data: 1.2,1.6,2.1,1.2,1.8,2.2,1.2,1.6,1.8,and 2.0. Mean = ____________________ Median = ____________________ Mode = ____________________

Cell phone calls The frequency of cell phone call per day on a certain account is tabulated in the following table: Calls per Day Number af Days 0-2 12 3-5 8 6-8 5 9-11 3 12-14 1 15-17 1 -Calculate the standard deviation of calls per day.

You are interested in beginning a small business enterprise and one aspect of your research is to look at the loan record for stockholders of small business corporations.A14-year record of net loans from stockholders of small business corporations (in billions of dollars)are as follows: 1.6,-0.2,1.0,1.4,-0.1,0.6,1.5,0.9,2.2,1.3,1.9,1.9,2.8,and 5.0. Calculate the median. ____________________ billion

Texas Department A monthly report to the Texas Department of Health,division of Water Hygiene,contained the following water production data in thousands of gallons: 5263 5636 5264 4395 6090 5293 4668 5725 5171 4378 5118 5538 4838 5167 5119 5438 6843 5262 4653 5303 5913 4570 5142 5964 6431 4719 5358 6043 4554 5805 -What are the 1st,2nd,and 3rd quartiles? Q1 = ____________________ Q2 = ____________________ Q3 = ____________________

A sample of 15 observations has a standard deviation of 4.The sum of the squared deviations from the sample mean is:

The numerical value of the coefficient of determination r ²

Find the midrange for the following data: 14,99,53,67,16,55,and 11.

Salaries The salaries (in thousands of dollars)for a sample of 13 employees of a firm are: 26.5,23.5,29.7,24.8,21.1,24.3,20.4,22.7,27.2,23.7,24.1,24.8,and 28.2. -Compute the first quartile.

In a given data sample,the mean is larger than the median,and both are larger than the mode.Identify and illustrate the shape of the distribution.

Given the following graphic: A)What do the asterisks (*)represent? B)What does the line in the middle of the box represent?

When a distribution has more values to the right and tails to the left,we say it is skewed positively.

What is the coefficient of variation of the following sample data set: 12,9,5,23,11,8,16,and 6?

The difference between the largest and smallest values in a data set is called the:

Expressed in percentiles,the interquartile range is the difference between the: